Climate and the Environment

In the UK the addition of lime to agricultural land was strongly encouraged by Government subsidy payments to farmers, but since subsidies ceased in the late 1970’s the application of lime has declined with subsequent acidification of many soils. Increasing soil pH is thought to have biodiversity and agricultural benefits including increased bio-availability of soil nutrients, greater plant growth, improved forage quality and enhanced earthworm populations, which in turn could benefit wading birds that rely on them as a food source. This study investigated these reported benefits.

Risk assessments of plant pests/pathogens rarely account for potential impacts on biodiversity associated with the affected host. We study the co-occurring trees ash and oak affected by ash dieback and acute oak decline, respectively, and show that declines in both these trees would impact on 512 associated species that don’t use any other UK tree species. This cumulative impact means 141 (38%) more affected associated species than when the trees decline individually.

Woodland expansion is a key part of the Scottish and Westminster Governments’ plans to meet net zero carbon emission targets by 2045 and 2050 respectively. Here, we use replicated experiments to study the changes that occurred on heather dominated moorland when birch and Scots pine were planted. On decadal timescales we found that net ecosystem carbon storage did not increase, above ground gains being off-set by loss of carbon from the soil.  There were few other changes in soil chemistry, but the soil microbial community was shown to change, as was the above ground vegetation.

The continued grazing of the uplands is contentious as the goals of rewilding and farming/crofting often appear in conflict. Any changes to land use will result in cascading impacts through ecosystems, and decisions about land-use need to be informed by data to show that benefits will exceed the disbenefits. Our unique, long-term, large-scale grazing experiment at Glen Finglas provides some key pieces of the evidence on the ecological trade-offs that occur when management is changed.