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UK land-use change and its impact on SOC: 1925-2007

机译：英国土地利用变化及其对SOC的影响：1925-2007年

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摘要

The contribution of soil organic carbon (SOC) to atmospheric greenhouse gas (GHG) concentrations could increase due to rising temperatures, agricultural land-management, and land-use change. Here the results of a modeling study are presented, which reviews the changing patterns of UK land-use from 1925 to 2007, and estimates the contribution that these changes have had toward UK GHG emissions. The study uses a large database of SOC concentrations from which SOC stocks are estimated for land-uses typical of the UK, and combines this with literature values of transition times for SOC to adjust to a new concentration following land-use change. The model was designed to be used with limited input data, allowing the impacts of historical land-use change, lacking in site specific soil and vegetation change data to be assessed. This study suggests that from 1925 to 2007 the UK's soils have acted as a net carbon sink as a result of land-use change, sequestering a total of 102 Tg C. This represents a 5% net gain in total SOC stocks, and an average increase of 1.9 Tg C/year (inter-quartile range: 0.19-3.12 Tg C/yr). When the reported losses of SOC due to climate change are compared to the gains resulting from land-use change the UK's soils are a sink of carbon, with the gains from land-use change offsetting those due to climate change. This overall sink is the result of an increase in the area of woodland, and conversion of arable land to permanent grassland. The greatest sequestration in any one year occurred in 1993 and coincides with the introduction of set-aside. The largest SOC flux to the atmosphere occurred in 1942 following arable expansion, emitting 12.3 Tg C in one year. This flux is equivalent to almost 10% of the UK's current total GHG emissions, indicating that such land-use change should be avoided in the future if targets to reduce GHG emissions are to be met.
机译：由于温度升高，农业土地管理和土地利用变化，土壤有机碳（SOC）对大气温室气体（GHG）浓度的贡献可能增加。本文介绍了建模研究的结果，该研究回顾了1925年至2007年英国土地使用方式的变化，并估计了这些变化对英国温室气体排放的贡献。这项研究使用了一个庞大的SOC浓度数据库，据此可以估算出英国典型土地用途的SOC存量，并将其与SOC过渡时间的文献值结合起来，以适应土地用途变化后的新浓度。该模型旨在用于有限的输入数据，从而可以评估历史土地使用变化的影响，评估缺乏特定地点的土壤和植被变化数据。这项研究表明，从1925年到2007年，由于土地用途的变化，英国的土壤一直是碳净汇，其固存的碳总量为102 TgC。这表示SOC总储量净增5％，平均每年增加1.9 Tg C（四分位间距：0.19-3.12 Tg C / yr）。将报告的气候变化导致的SOC损失与土地利用变化带来的收益进行比较，英国的土壤是碳汇，土地利用变化带来的收益抵消了气候变化带来的收益。该总汇是林地面积增加以及耕地向永久草地转化的结果。在任何一年中，最大的固存发生在1993年，恰好是提款的引入。最大的SOC通向大气的通量发生在1942年耕种后，在一年内排放了12.3 TgC。这种通量几乎等于英国当前温室气体总排放量的10％，这表明如果要实现减少温室气体排放的目标，将来应避免这种土地用途的变化。

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