CHANGES IN SOIL CARBON INVENTORIES FOLLOWING CULTIVATION OF PREVIOUSLY UNTILLED SOILS
CHANGES IN SOIL CARBON INVENTORIES FOLLOWING CULTIVATION OF PREVIOUSLY UNTILLED SOILS
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DOI：
10.1007/bf00000786
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发表时间：
1993-01-01
期刊：
影响因子：
4
通讯作者：
ACKERMAN, IL
中科院分区：
文献类型：
--
作者：
DAVIDSON, EA;ACKERMAN, IL
以前未耕作的土壤的耕作通常会导致碳从土壤释放到大气中，这可能会影响当地的土壤肥力和全球的大气CO2负担。由于缺乏关于耕作和未耕作土壤碳储量的高质量比较数据，对这种通量的大小的概括受到阻碍。利用最近几项研究的数据，我们重新审视了以前对这一主题的评论的结论。根据土壤采样的发生层或固定深度，将数据划分为子集。固定深度取样似乎低估了土壤碳的损失，但这两个子集的数据支持早期的结论，即20%至40%的土壤碳在种植后损失。我们最好的估计是整个土壤流失了大约30%。我们的分析也支持这样的结论，即土壤碳的损失大部分发生在最初的几年内（甚至在某些情况下在两年内）后的初始耕作。我们的分析不支持早期的结论，即土壤碳的部分损失是正相关的碳量最初存在于未开垦的土壤。我们发现，未开垦土壤的碳含量和耕作后的碳损失率之间没有关系。
Cultivation of previously untilled soils usually results in release of carbon from the soil to the atmosphere, which can affect both soil fertility locally and the atmospheric burden of CO2 globally. Generalizations about the magnitude of this flux have been hampered by a lack of good quality comparative data on soil carbon stocks of cultivated and uncultivated soils. Using data from several recent studies, we have reexamined the conclusions of previous reviews of this subject. The data were divided into subsets according to whether the soils were sampled by genetic horizon or by fixed depths. Sampling by fixed depths appears to underestimate soil C losses, but both subsets of data support earlier conclusions that between 20% and 40% of the soil C is lost following cultivation. Our best estimate is a loss of about 30% from the entire soil solum. Our analysis also supports the conclusion that most of the loss of soil C occurs within the first few years (even within two years in some cases) following initial cultivation. Our analysis does not support an earlier conclusion that the fractional loss of soil carbon is positively correlated to the amount of carbon initially present in the uncultivated soil. We found no relation between carbon content of uncultivated soil and the percentage lost following cultivation.