Work Package 1.1 - Soil
Soil functions rely on a number of soil processes and properties, including soil structure, organic matter content, nutrient cycling and soil biodiversity. The sensitivity to change of each of these processes and properties will determine the overall resilience of soil functions, which is likely to vary among differing soil types. The challenge is to provide evidence of changes in soil function under different threats (e.g. climate change, nitrogen deposition, land use change) and to assess the relative impact of these threats within and between different habitats. Understanding the nature and impacts of threats to soil functions will contribute to identification of management options to increase the resilience of soil.
Aim of Research
To understand resilience of soils in Scottish semi-natural ecosystems. This research aims to understand the relationships among disturbance factors, soil properties, processes and soil functions for a range of important Scottish semi-natural ecosystems (peatland, moorland, woodland, grassland, alpine systems). This will enable assessments of the resilience of soil functions to changes in climate, environmental, and socio-economic factors.
This work builds on previous work within the RESAS strategic Programme and on collaborations with UK and international partners.
Work in the final year of the program included completion of Covid-delayed work from year 5 and two new areas of work exploring the potential of citizen science and eDNA approaches for exploring soil biodiversity and the management of soil carbon in upland landscapes. Work on soil stabilisation by roots and the resilience of soils to physical perturbation was completed and presented at the delayed 5th International Conference for soil bio- and eco-engineering. This work has increased our understanding of how root mechanical properties change during decomposition and how this impacts the mechanical resilience of soils, especially in wooded habitats. Research results demonstrated the variability in both root strength and root contributions to soil reinforcement and shows how their mechanical strength declines during decomposition. This work will enhance our ability to understand slope stability in the face of climate change.
In alpine habitats we built on our previous study of soil biodiversity and ecosystem properties across the Ben Avon plateau (Cairngorms) with a pilot study to test the potential of citizen science and eDNA approaches for exploring soil biodiversity. Partnering with plant and fungal conservation charity Plantlife, we combined state-of-the-art molecular identification methods with field sampling of soils by volunteer citizen scientists to examine fungal diversity in alpine habitats across the Cairngorms National Park. Results supported those from the Ben Avon study which showed that distinct communities of soil organisms are associated with different elements of the alpine vegetation mosaic. This work has enhanced our understanding of the diversity of fungi in Scottish alpine soils, raised the profile of soil biodiversity with the public, and will be used to help identify priority areas for conservation.
The second new area of work focussed on management of soil carbon in upland landscapes, building on data from our experimental studies of driver impacts on, and resilience of, soil functions in our focal semi-natural ecosystems (especially moorlands and peatlands). Tree planting is among the most prominent nature-based solutions to climate change because of its large potential to sequester carbon. However, there is debate around its impacts on pre-existing carbon stocks in upland organic soils. A literature review of the impacts of tree planting on upland organic soils showed that, in general, soil organic carbon (SOC) increases following tree planting on soils with a low starting SOC but decreases on soils with a high SOC. Tree-planting on organic-rich soils may lead to net ecosystem gains in carbon over the very long term, but there is little evidence that it has a positive effect in the first 20 years after planting. This work shows that tree-planting strategies in upland landscapes need to pay careful attention to planting the ‘right tree in the right place’. Peatland restoration is also a prominent nature-based solution to climate change, but its effectiveness may in itself be influenced by climate. Data on water table depth in re-wetted peatlands were used to investigate effectiveness of restoration in wet vs dry locations across Scotland. This indicated that peatland restoration in wetter, western locations may be more effective at achieving stable water table depth. Water table depth data were also used to estimate carbon emissions from restored sites and these estimates suggest that 45% of all monitored peatland restoration sites have returned to net carbon accumulation, with emissions savings being made at 88% of sites.
- Mountain heights, hidden depths – biodiversity in Scotland’s alpine soils: Difficulties of accessing remote locations and a shortage of skilled scientists able to identify soil organisms have combined to limit our knowledge of soil biodiversity in alpine ecosystems. In collaboration with charity Plantlife, we worked to raise public awareness and scientific knowledge of soil fungal biodiversity across the Cairngorms National Park through a citizen science soil DNA project. Volunteers from the mountain-going community were recruited and trained to collect soil samples for DNA analysis and collected a total of 219 soil samples from 55 out of the 58 Munros (mountains over 3,000ft) within the National Park. Analysis of DNA extracted from the samples revealed that 2748 fungal taxa were present, with distinct communities found under grassland, moss heath and shrub heath vegetation and the most species-rich communities being associated with alpine grasslands. The work has been extensively covered in the media and was recently highlighted in a SEFARI case study.
Work has continued to build our understanding of how resilient soils in Scottish semi-natural habitats are to disturbance. Work in year 5 focussed on synthesising information gained from field sampling campaigns across alpine, moorland, woodland, peatland and grassland ecosystems. This information has been used to enhance our understanding of how soils respond to a variety of global change impacts and how ecosystems and habitats differ in their resilience to change. This work will enhance our ability to predict the effects of future climate change and management activities on important soil properties including carbon stocks and biodiversity.
In grasslands, the impact of liming at different rates on soil carbon and nitrogen cycling processes was tested. Liming is a common management technique in agricultural grasslands, used to increase productivity of inherently acidic soils. Experiments demonstrated that, 1.5 years after lime application, soil pH was increased and cycling of both nitrogen and carbon was enhanced, showing the beneficial effects of increased pH on grass growth. Applying a range of different stresses to the soil microbial community showed that although the community was more active after liming, its resilience to perturbations was not impacted.
In alpine habitats, an initial analysis of environmental conditions, plant communities, soil chemistry and soil biology across the Ben Avon plateau (Cairngorms) was completed. The data demonstrated that soil carbon and nitrogen stocks varied between habitats within the alpine mosaic, with very large stocks in wet heaths at lower altitude and much smaller stocks in summit habitats. Soil biodiversity showed the opposite trend, with diverse communities and many unique species associated with the most extreme habitats. A laboratory experiment investigating the resilience of alpine communities to drought periods showed that habitats dominated by different plant groups (mosses, grasses or shrubs) differed in their responses to drought but were all resilient to droughts of up to four weeks. On re-wetting, nitrogen was released from the soil and the communities differed in their ability to retain water, this could have implications for the quantity and quality of surface water following droughts.
In moorland habitats, a study of the impacts of tree planting on soil carbon stocks was completed. This confirmed the results from the previous year that showed that tree planting on organic moorland soils does not always lead to a net increase in carbon stocks in the first four decades following tree planting. This work has important implications relating to the effectiveness of tree planting on moorland soils as a climate change mitigation technique.
In peatlands, work to determine the success of peatland restoration techniques, and the resilience of restored peatlands to climate variability has continued. Measurements of water table dynamics and decomposition processes in restored peatlands have contributed to synthesis studies showing the overriding importance of water table depth for determining the greenhouse gas balance of managed peatlands.
- Tree planting does not lead to a net increase in stored carbon on decadal timescales: Tree planting is increasingly being proposed as a strategy to combat climate change through carbon sequestration in tree biomass. Using a long-term replicated experiment where pine and birch were planted on heather moorland, we calculated the total carbon stocks stored in the trees and soil 12 and 39 years after planting. We showed that tree planting did not lead to a net increase in carbon storage after planting. Plots with trees had greater soil respiration and lower soil organic carbon than control plots with heather. The decline in soil organic carbon cancelled out the increase in carbon stocks in tree biomass on decadal timescales. At all four experimental sites sampled, there was no net gain in ecosystem carbon stocks 12–39 years after afforestation— we found a net ecosystem carbon loss in one of four sites with deciduous birch stands; no net gain in ecosystem carbon at three sites planted with birch; and no net gain at additional stands of Scots Pine. Differences between sites may be due to differences in the age of the trees. The results are of direct relevance to current policies, which promote tree planting on the assumption that this will increase net ecosystem carbon storage and contribute to climate change mitigation. The work has been published in Global Change Biology.
Work has continued to progress our understanding of the resilience to disturbance of soils in key Scottish semi-natural ecosystems. During Year 4 work has focussed around field sampling in alpine, heathland, peatland and grassland systems. The data collected is being used to support the development of models of ecosystem behaviour. These models will improve our ability to explore scenarios of global change impacts on these soils and their consequence for ecosystem functioning.
The physical, chemical and biological properties of soils included in the National Soils Inventory of Scotland were investigated to determine which environmental and land use parameters explained differences among soil types across Scotland. Inventory data were combined with large-scale datasets of soil physical and chemical properties to allow the relative importance of intrinsic soil properties, environmental conditions, and management practices to be evaluated. In combination, the data demonstrated strong impacts of land use and nitrogen concentrations on soil physical, chemical, and biological properties, with lesser impacts of altitude, rainfall and temperature. This work improves our understanding of the key drivers influencing the development of soils and their properties in Scotland.
Development of Fourier Transform Infra-Red (FTIR) spectroscopy as a method for assessment of aggregate stability and soil erosion risk has continued. Relationships between FTIR spectral data and aggregate strength of soils were previously developed for dry, milled archive samples. This year, with the aim of working towards a field-based method, FTIR spectral data of almost 130 field-condition soils was recorded, and correlations to aggregate stability and carbon were developed.
In alpine habitats, work to characterise environmental conditions, plant communities, soil chemistry and soil biology across and extensive mosaic of alpine habitats on the Ben Avon plateau (Cairngorms) was completed. Initial analysis of these data highlighted strong links between environmental conditions, biodiversity and ecosystem functions such as carbon storage. The data also demonstrated the unique biodiversity which is associated with late lying snow patches; a habitat severely threatened by climate change. Laboratory experiments were also conducted to investigate the impact of summer drought on functioning of alpine habitats dominated by grasses, mosses, or shrubs. Data from these experiments will be combined with data from the Ben Avon survey work to inform development of models of alpine ecosystem responses to climate change.
Work on the long-term MOORCO experiment continued to assess how moorland soils change following planting of birch and pine. The soil microbial community differed between moorland and woodland plots but this did not result in the expected change in decomposition rates – possibly due to the drought (2018) when the data were collected. While work from Stirling university showed a decline in soil carbon with tree planting, our work showed that other soil chemical properties were slow to change. Additional data from a second site were collected in 2019 and will be used to confirm these results. The work has implications for plans to expand woodland to mitigate climate change.
In peatlands, a third year of data collection added further weight to the observation that restoration is beneficial for site hydrology and decomposition characteristics. Restoration sites are more sensitive to drought than near-natural reference sites, but sites where advanced restoration methods have been applied are more resilient.
In grasslands, a 2.5-year field experiment investigating the impacts of liming on soil functions was completed. Liming is a common management technique that increases soil pH and potentially impacts a great many soil biological and chemical functions. A suite of soil assays were applied to assess impacts on soil processes and their interactions, and subsequently to measure resilience of the soil system (both in trajectories of change following liming and through applying water stress treatments to soils that had been limed, or not).
Research to develop outline models of ecosystem response to key drivers of change including climate, nitrogen pollution and land use change, continued this year with analysis of data from lab-based studies of nitrogen deposition impacts on alpine Racomitrium heath. This work demonstrated the ability of alpine soils to retain pollutant nitrogen and the sensitivity of soil water quality to changes in nitrogen inputs. Reductions in nitrogen deposition could lead to rapid improvements in surface water quality, but vegetation and soils previously exposed to high nitrogen loads have reduced resilience to future nitrogen inputs.
- Impacts of nitrogen deposition on carbon and nitrogen cycling in alpine moss heath. A paper highlighting the impact of nitrogen deposition on alpine ecosystems was published. This highlighted that,in alpine Racomitrium moss heath, nitrogen deposition is associated with moss mat degradation and a shift to grass-dominated vegetation. The research found that high nitrogen deposition reduces above ground carbon and nitrogen stocks and that nitrogen accumulates in the soil, where it can be leached to waters. When nitrogen deposition is reduced, soil water quality rapidly improves, but past exposure to high nitrogen deposition reduces ecosystem ability to retain future nitrogen inputs. The research highlights the rapid benefits from policies to reduce nitrogen deposition and the long-term damage caused by air pollution.
Comprehensive analysis of soil microbial community structures across key Scottish ecosystems, based on the National Soil Inventory of Scotland, has been completed: globally this is the most comprehensive characterisation of soil microbial diversity available at a national scale. The data challenge the common perception of soil pH as the sole driver of diversity and demonstrate management intensity as an additional major influence; in highly managed systems at neutral to high pH, bacterial community richness was much higher and the composition much more homogenous than in more natural systems. Fungal community composition was also strongly related to vegetation and land use.
Work on developing novel methods for the assessment of aggregate stability and soil erosion risk using Infra-red spectroscopy has continued. Promising correlations between both Fourier Transform Infra-Red (FTIR) and Near Infra-Red spectral data with aggregate stability, suggest that there is potential for using IR spectroscopy to assess aggregate stability and contribute to assessment of erosion risk.
Previous work in alpine systems demonstrated that basic information on ecosystem structure and functioning are needed to enable assessment of change and predict the likely impact of environmental drivers. This year, the focus of experimental work has been widened to include a new large scale analysis of pristine alpine systems, using Ben Avon in the Cairngorm plateau – the largest, near-pristine montane area in the UK. Data on a wide range of above- and below-ground parameters have been collected from across a heterogeneous alpine habitat mosaic, providing unique insights into how aboveground vegetation diversity has cascading impacts belowground, affecting soil biodiversity and functioning.
Work on the long-term moorland tree colonisation (MOORCO) experiment continued. Soil sampling under birch and pine trees, 15 years after they were planted, has shown differences in carbon storage in the soil under the different tree species. The work has implications for woodland expansion plans to mitigate climate change by increased carbon storage.
In grasslands, work continued on the liming trial established in 2017. Liming strongly impacts soil chemistry (e.g. solubility of plant nutrients) and biological processes (e.g. microbial community structure and greenhouse gas fluxes). Experimental treatments included low and high liming in conjunction with levels of drought as a stress. A database of biological and chemical soil properties in the study was created and samples were taken throughout the year and analysed for microbial community size, nematode communities and nutrients. This data will be used to determine how soil function is affected by stress and if resilience of the soil system can be linked to pH. Effects of pH on resilience were also tested in a precision liming trial, where soil pH was managed to levels optimal for grass growth. While precision liming altered the activity of the soil microbial community, particularly for nitrogen cycling processes, the resilience of those communities to external perturbation was not changed. The observed reduction in potential denitrification at higher pH, reflected the reduction in greenhouse gas emissions seen in complementary measurements in other Scottish Government funded work.
In peatlands, the second full year of data collection added evidence that restoration at formerly afforested peatlands is beneficial for both site hydrology and decomposition characteristics, although the responses have not yet reached the near-natural (target) state. With 2018 having been a year with an extended summer drought, the data now also allow us to begin to evaluate resilience in relation to climate variation. All restoration treatments were more sensitive to drought than the target state, but areas that had undergone more advanced restoration methods were more resilient to drought. Data from this work is now being brought together to form an outline model aiming to predict tipping points in relation to effectiveness of peatland restoration managements. This model will be refined by the addition of new experimental data as the project progresses.
- Understanding alpine ecosystem function: Work on heterogeneous mosaics of alpine communities in the Cairngorms has shown how topography shapes the distribution of alpine plant communities. The study then demonstrates how this, in turn, has cascading impacts belowground, shaping the distribution of soil fungal communities and impacting on soil functions such as enzyme activities associated with carbon and nutrient cycling. Differences in the amount and quality of carbon inputs from plant litter appear to be one of the key links between above and below ground communities.
- Plant biodiversity and nitrogen deposition: Large scale survey data from the Hutton, in combination with other data resources from across the UK, has enabled SEFARI scientists and UK collaborators to propose that a thirty-year moving window of cumulative nitrogen deposition is the most relevant measure to represent impacts on plant communities for application in science, policy and ecosystem management. Such a metric allows long-term impacts of nitrogen deposition to be included, while allowing for the impact of declining deposition to also be taken into account – something that cumulative deposition does not allow for as this will always increase.
The first comprehensive overview of soil microbial communities across Scotland using DNA extracted from samples collected as part of the National Soils Inventory of Scotland revealed that soil pH is the major driver influencing microbial communities. Communities in soils with lower pH were more species poor and had a different composition from those with higher pH. Communities in Machair soils had the highest species richness and were most dissimilar from the rest of the Scottish soils. There was also some indication that habitat, vegetation type and underlying geology all contribute to subgroups of communities within the major pH split.
Work has continued to explore the relationships between Near Infra-Red (NIR) spectra and the aggregate strength of soil, with a view to developing a method for rapid assessment of topsoil stability and assessing erosion risk. Initial correlations between the spectra and the aggregate strength proved promising.
Work using our unique long-term field experiments has continued to examine different aspects of soil resilience in alpine, moorland, peatland and grassland systems. In alpine systems, work focussed on the fungal communities in moss shoots and in soil beneath Racomitrium moss carpets along a nitrogen deposition gradient spanning England, Wales and Scotland. These fungal communities were found to be species rich, with over 1700 species of fungi detected. Community structure was strongly influenced by levels of nitrogen deposition, with distinct differences in species composition between regions. However, no single fungus or group of fungi appeared to consistently react to elevated nitrogen deposition. Observed increased decomposition of moss mats therefore seems unrelated to fungal community composition.
In moorland systems, work has continued on the long-term experiment that was established 13 years ago to assess how soil biology changes as trees colonise moorland (MOORCO). Joint projects have been developed with Stirling University and Bangor University to study how carbon dynamics change in relation to tree size and distance from the edge of a group of trees.
In peatlands, an experiment was successfully set up examining effects of different restoration techniques on water table and litter decomposition kinetics. Initial data analysis showed that the enhanced restoration techniques (brash crushing and furrow blocking) resulted in water tables being closer to the surface across all sites tested, although there was high variability throughout the year. Decomposition characteristics show similar beneficial effects of enhanced restoration. A summary policy report of the first two years was produced and sent to the stakeholder group.
In grassland systems, a major experiment to investigate the impacts of liming was established; soil samples were collected before and after liming and processed to assess the biological functioning of the soil system. This included metabolism (enzyme activities and processing of multiple carbon sources), microbial community size and structure as well as the populations of both nematode and enchytraid worms. Pools of nutrients including carbon, nitrogen, and phosphorus were also assessed. Analysis of the data will assess the resilience of soil functions under different levels of liming.
- Ecosystems and land use: New research on use of satellite imaging to monitor peatland restoration for ecosystem functioning and modelling to quantify impacts of climate change were presented to the Ecosystems and Land Use Stakeholders Engagement Group (ELSEG, 14th November 2017). Ongoing survey work to maintain long-term vegetation datasets was also presented, highlighting their use (e.g. by SNH and SEPA) to assess impacts of pollution, grazing and climate as drivers of change (link to meeting report).
- Ecosystems and diversity: Molecular analysis of bacterial communities from soils collected during the National Soil Inventory for Scotland resampling (2007-9) revealed a vast diversity of species present in soils (more than 300,000) that underpin the functioning and resilience of Scottish soils and ecosystems. This will provide a unique baseline against which to detect subsequent change from human and environmental influences.
- UK alpine systems and environmental change: A successful research workshop at the James Hutton Institute (January 2018) brought together academics, government agencies and NGOs from Scotland, England and Wales to discuss the current state of knowledge regarding environmental change impacts on alpine ecosystems in the UK and future research needs.
- The changing face of Scottish grassland vegetation: A paper based on a re-survey of semi-natural grasslands showed significant changes over the last 40 years with nitrogen-demanding and moisture-requiring species increasing (possibly due to increases in atmospheric nitrogen deposition and rainfall) and, in Nardus grasslands, species with low tolerance to very acidic soils also increasing (possibly due to a decrease in sulphur deposition). This is one of the first studies to show changes in vegetation due to the decline in sulphur deposition, indicating that it requires at least 40 years since the peak of deposition for the vegetation to begin to recover.
In the first year of this research, we developed a national inventory of soil surveys and long-term experiments where soils have been sampled. We assessed the suitability of these long-term and large-scale datasets for investigating resilience in Scottish semi-natural soils and identified key data gaps in the soil properties and habitats covered. While soil sampling schemes covered a range of habitats from alpine to coastal, there was greatest information for woodland and farmland habitats. Semi-natural grasslands, peatlands and urban habitats were least well represented. There was also a lack of studies which had been repeated through time, making assessment of change difficult. Most sampling schemes focussed on chemical data, with physical and biological information rarely available. This assessment will guide future priorities for collection of soils data.
The National Soil Inventory of Scotland is a key resource, with complete spatial coverage of Scotland and a comprehensive range of chemical, physical and biological properties being sampled. Molecular methods for studying soil biology are evolving rapidly, and samples from the National Soil Inventory have been re-analysed to exploit advances in technology, allowing much greater taxonomic resolution of soil communities.This new biological data was then integrated with existing chemical and physical data from the National Soil Inventory of Scotland.
Soil erosion remains a threat to sustainable management of soil resources and we are developing methods and models including spectroscopic assessments and practical tools for quantification of soil strength to assess the risk of erosion and identify mitigation strategies. Understanding what makes plant roots strong, and how this strength contributes to the stability of soil, is critical in providing ecological solutions for engineers and land managers. Work this year highlighted significant species differences in root strength following death. Better informed choice of species could therefore contribute to predicting changes in soil and slope stability and in providing science-based guidance to engineers, foresters, and land managers.
Nitrogen deposition is a key threat to semi-natural ecosystem function, with significant impacts on soil properties and processes. Upland semi-natural ecosystems can be at particular risk due to high rates of nitrogen deposition in rainfall. Racomitrium moss heath is a nationally important mountain plant community in which decomposition and nutrient cycling processes have been shown to be strongly affected by nitrogen deposition. Analyses of moss- and soil-associated nitrogen cycling microorganisms along a nitrogen deposition gradient found them to be below the detection limits, suggesting that these microbes have a limited role in N cycling within these systems. Fungi are the primary recyclers of organic matter (including organic nitrogen sources) and so changes in fungal communities may be the primary cause of the negative relationship between moss-mat depth and nitrogen deposition.
- 48 tweets were made over a 24-hour period to mark World Soil Day (5th Dec 2016) reaching nearly 6000 followers.
- Studies of Machair systems show that the timing of fertiliser application and rates directly affects nitrogen loss. Results show that tillage and fertiliser application to Machair systems, typical of traditional agricultural management, leads to changes in the functional attributes of the soil microbial community. Fertilisation of the Machair enhances microbial activity and boosts the abundance of functional genes involved in nitrogen cycling, whereas arable farming on these systems reduced microbial activity compared to fertilised permanent grass.
Some elements of the research that was carried out in RD112 are being continued and expanded in the Natural Resources Theme of the new Strategic Research Programme. In particular, the successful pilot study using citizen science and DNA approaches to explore alpine soil biodiversity in the Cairngorms will be further expanded under the biodiversity topic, to cover the whole of Scotland. This work will help to build a much more accurate picture of soil species distributions and contribute to creating a more complete biodiversity inventory for Scotland. Work on peatland restoration and resilience to climate change will also continue in the new Strategic Research Programme with a dedicated peatland project under the soils topic and associated projects funded by NERC. Research on soil physical stability and development of techniques such as FTIR for soil assessment will also continue under the soils topic.
- Wilcox, K.R.; Tredennick, A.T.; Koerner, S.E.; Grman, E.; Hallett, L.M.; Avolio, M.L.; La Pierre, K.J.; Houseman, G.R.; Isbell, F.; Johnson, D.S.; Alatalo, J.M.; Baldwin, A.H.; Bork, E.W.; Boughton, E.H.; Bowman, W.D.; Britton, A.J.; Cahill, J.F.; Collins. Asynchrony among local communities stabilises ecosystem function of metacommunities. Ecology Letters, 20, 1534-1545.
- Shu X, Griffiths BS, Hallett P, Baggs E and Daniell T. (2017). Soil functional resistance and resilience of C and N processes to environmental stresses. Nanjing Agricultural University, 15th Jan 2017.
- Shu, X., Griffiths, B.S., Hallett, P.D., Baggs, E.M. and Daniell, T.J. (2017). Resistance and resilience of soil nitrogen cycling to environmental stresses. American Society of Agronomy, Crop Science Society of America and Soil Science Society of America, Annual Meeting, Tampa, Florida. Oct. 22-25, 2017.
- Landl, M.; Huber, K.; Schnepf, A.; Vanderborght, J.; Javaux, M.; Bengough, A.G.; Vereecken, H. A new model for root growth in soil with macropores. Plant and Soil, 415, 99-116.
- Britton, A.J., Mitchell, R.J., Fisher, J.M., Riach, D.J., Taylor, A.F.S. (2018) Nitrogen deposition drives loss of moss cover in alpine moss-sedge heath via lowered C:N ratio and accelerated decomposition. New Phytologist 218, 470-478.
- Campbell, G.A.; Lilly, A.; Corstanje, R.; Mayr, T.R.; Black, H.I.J. Are existing soils data meeting the needs of stakeholders in Europe? An analysis of practical use from policy to field. Land Use Policy, 69, 211-223.
- Payne, R.J.; Campbell, C.; Britton, A.J.; Mitchell, R.J.; Pakeman, R.J.; Jones, L.; Ross, L.C.; Stevens C.; Field, C.; Caporn, S.J.M.; Carroll, J.; Edmondson, J.L.; Carnell, E.J.; Tomlinson, S.; Dore, A.J.; Dise, N.; Dragosits, U. (2019) What is the most ecologically-meaningful metric of nitrogen deposition? Environmental Pollution, 247, 319-331.
- Loades, K. (2018) How vegetation shapes the landscape we see. The Geographer, Autumn 2018, p 23.
- Rebekka R.E. Artz, Gillian Donaldson-Selby, Mark Hancock, Neil Cowie (2018) Further management after initial felling to waste enhances the hydrological recovery of formerly afforested peatlands. Flow Country Conference V: Expanding perspectives. Thurso, Caithness – Oct. 31st – Nov 2nd 2018.
- Mitchell, R.J. (2018) Long-term experiments for long-lived species: tree colonisation on moorland in Scotland (MOORCO). British Ecological Society Annual meeting, Birmingham, December 2018.
- Malanson, G.P.; Virtanen, R.; Britton, A.J.; Jiménez-Alfaro, B.; Qian, H.; Petraglia, A.; Tomaselli, M.; Cooper, D.; Damm, C.; Pemble, R.H., Brett, R.B. (2020) Hemispheric- and continental-scale patterns of similarity in mountain tundra). Annals of the American Association of Geographers, 110, 1005-1021.
- Britton, A.J., Gibbs, S., Fisher, J.M., Helliwell, R.C. (2019) Impacts of nitrogen deposition on carbon and nitrogen cycling in alpine Racomitrium heath in the UK and prospects for recovery. Environmental Pollution, 254, 112986.
- Britton, A., Freitag, T., Oddi, L., Fielding, D., van Paassen, J., White, D., Robinson, L., Taylor, A. (2019) Topography drives heterogeneity in alpine soil function. Poster and talk at the International Mountain Conference, Innsbruck, 8-12 September 2019.
- Artz, R.R.E. (2019) Restoring our peatlands as part of natural climate solutions: the state of the UK science. Presentation at COP25 Climate Change Conference, Madrid, Spain, 2019, at Chilean-Scottish side event in UK Pavilion, 2-13 December 2019
- Lilly, A. (2019) Soil erosion is a serious global issue affecting our ability to feed the world. The Scotsman, 5th December 2019.
- Boldrin, D., Bengough, A.G., Lin, Z., Loades, K.W. (2021) Root age influences failure location in grass species during mechanical testing. Plant and Soil, 461, 457-469. DOI:10.1007/s11104-020-04824-6.
- Friggens, N.L., Hester, A.J., Mitchell, R.J., Parker, T.C., Subke, J-A., Wookey, P.A. (2020) Tree planting in organic soils does not result in net carbon sequestration on decadal timescales Global Change Biology 26, 5178-5188
- Evans, C.D., Peacock, M., Baird, A.J., Artz, R.R.E., Burden, A., Callaghan, N., Chapman, P.J., Cooper, H.M., Coyle, M., Craig, E., Cumming, A., Dixon, S., Gauci, V., Grayson, R.P., Helfter, C., Heppell, C.M., Holden, J., Jones, D.L., Kaduk, J., Levy, P., Matthews, R., McNamara, N.P., Misselbrook, T., Oakley, S., Page, S.E., Rayment, M., Ridley, L.M., Stanley, K.M., Williamson, J.L., Worrall, F., Morrison, R. (2021) Overriding water table control on managed peatland greenhouse gas emissions. Nature, 593, 548-552.
- Ritson, J.P., Alderson, D.M., Robinson, C.H., Burkitt, A.E., Heinemeyer, A., Stimson, A.G., Gallego-Sala, A., Harris, A., Quillet, A., Malik, A.A., Cole, B., Robroek, B.J.M., Heppell, C.M., Rivett, D.W., Chandler, D.M., Elliott, D.R., Shuttleworth, E.L., Lilleskov, E., Cox, F., Clay, G.D., Diack, I., Rowson, J., Pratscher, J., Lloyd, J.R., Walker, J.S., Belyea, L.R., Dumont, M.G., Longden, M., Bell, N.G.A., Artz, R.R.E., Bardgett, R.D., Griffiths, R.I., Andersen, R., Chadburn, S.E., Hutchinson, S.M., Page, S.E., Thoma, T., Burn, W., Evans. M.G. (2021) Towards a microbial process-based understanding of the resilience of peatland ecosystem service provisioning – A research agenda. Science of the Total Environment, 759, 143467.
- Britton, A.J., Taylor, A.F.S. (2022) How a teaspoon of soil can increase our understanding of the mountains. Lecture for Plantlife Spring into Action series.
- Mitchell, R.J. (2021) Tree planting – does it increase carbon storage? Talk at Aberdeen University public webinar series "Safeguarding ecosystems, protecting natural habitats and keeping carbon out of the atmosphere" 10th December 2021.
- Verbeke, B.A., Lamit, L.J., Lilleskov, E.A., Hodgkins, S.B., Basiliko, N., Kane, E.S., Andersen, R., Artz, R.R.E., Benavides, J.C., Benscoter, B.W., Borken, B., Bragazza, L., Brandt, S.M., Brauer, S.L., Carson, M.A., Charman, D., Chen, X., Clarkson, B.R., Cobb, A.R., Convey, P., del Aguila Pasquel, J., Enriquez, A.S., Griffiths, H., Grover, S.P., Harvey, C.F., Harris, L.I., Hazard, C., Hodgson, D., Hoyt, A.M., Hribljan, J., Jauhiainen, J., Juutinen, S., Knorr, H-K., Kolka, R.K., Kononen, M., Larmola, T., Mccalley, C.K., McLaughlin, J., Moore, T.R., Mykytczuk, N., Normand, A.E., Rich, V., Roulet, N., Royles, J., Rutherford, J., Smith, D.S., Svenning, M.M., Tedersoo, L., Thu, P.Q., Trettin, C.C., Tuittila, E-S., Urbanova, Z., Varner, R.K., Wand, M., Wang, Z., Warren, M., Wiedermann, M.M., Williams, S., Yavitt, J.B., Yu, Z-G., Yu, Z., Chanton, J.P. (2022) Latitude, elevation, and mean annual temperature predict peat organic matter chemistry at a global scale. Global Biogeochemical Cycles, 36, e2021GB007057.