An assessment of subsoil organic carbon stocks in E ngland and W ales
An assessment of subsoil organic carbon stocks in E ngland and W ales
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英格兰和威尔士地下有机碳储量评估
DOI：
10.1111/sum.12085
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发表时间：
2013
影响因子：
3.8
通讯作者：
Gregory A
中科院分区：
文献类型：
--
作者：
Gregory A
据估计，全球一半的土壤碳在底土中，但数据很少。我们更新了Bradleyet等人（2005年）利用土壤和土地利用数据库对英格兰和威尔士地下有机碳（OC）的估计，并将结果与其他已发表的数据进行了比较。我们估计英格兰和威尔士土壤在0-30、30-100和100-150 cm深度分别含有1633、1143和506 Tg的OC。因此，一半的土壤有机碳是在30厘米以下发现的。在30 cm以下的土壤中，泥炭土所占比例最大，占44%，其次是棕壤、地表水灰壤、地下水灰壤和灰化土。泥炭土在100 ~ 150 cm深度的单位面积剖面碳含量超过25%，而其他土壤在该深度的碳含量低于8%。土壤类型之间的差异与土壤形成过程的差异一致。不同土地利用方式之间的深度分布差异不大，但耕地土壤的底土有机碳储量普遍小于草地或其他土地利用方式下的土壤。文献中关于底土有机碳储量的数据很少，但这些数据与上述数据库工作的结果基本一致。几乎没有证据可以用来评估底土OC储量是如何随时间变化的。
It is estimated that half the soil carbon globally is in the subsoil, but data are scarce. We updated estimates of subsoil organic carbon (OC) in England and Wales made by Bradleyet al. (2005) using soil and land‐use databases and compared the results with other published data. We estimated that the soils of England and Wales contained 1633, 1143 and 506 Tg of OC at 0–30, 30–100 and 100–150 cm depths, respectively. Thus, half of the soil OC was found below 30 cm depth. Peat soils accounted for the largest proportion, containing 44% of all the OC below 30 cm despite their small areal extent, followed by brown soils, surface‐water gley soils, ground‐water gley soils and podzolic soils. Peat soils had more than 25% of their profile OC per unit area in the 100–150 cm depth, whereas most other soils had <8% at this depth. The differences between soil types were consistent with differences in soil formation processes. Differences in depth distributions between land uses were small, but subsoil OC stocks in cultivated soils were generally smaller than in soils under grassland or other land uses. Data on subsoil OC stocks in the literature were scarce, but what there was broadly agreed with the findings of the above database exercise. There was little evidence by which to assess how subsoil OC stocks were changing over time.