Soil carbon lost from Mollisols of the North Central USA with 20 years of agricultural best management practices
Soil carbon lost from Mollisols of the North Central USA with 20 years of agricultural best management practices
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DOI：
10.1016/j.agee.2012.08.011
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发表时间：
2012-11-01
影响因子：
6.6
通讯作者：
Lin, Ting-Li
中科院分区：
文献类型：
--
作者：
Sanford, Gregg R.;Posner, Joshua L.;Lin, Ting-Li
土壤有机碳（SOC）对农业土地管理高度敏感，因此管理耕地以封存大气CO2具有很大的意义。在这项研究中，我们评估了六种种植制度对SOC的影响，在威斯康星州综合种植制度试验（WICST）超过20年的时间。无论是浓度或质量每体积的土壤基础上的SOC分析表明，在WICST的所有系统的显着下降。虽然轮牧牧场系统在地表15厘米处封存了碳（C），但这些收益被深度损失所抵消。免耕（NT）的做法和列入多年生作物减少SOC的损失，但都没有导致土壤剖面中的C螯合。这项研究的结果表明，（i）比较当前和初始土壤样品时，评估SOC封存和（ii）评估整个土壤剖面的SOC变化的重要性。土壤有机碳在耕层以下深度的损失点，要么缺乏C输入从根，增加氧化损失在这些深度或两者兼而有之。由爱思唯尔公司出版
Soil organic carbon (SOC) is highly sensitive to agricultural land management, so there is a great deal of interest in managing cultivated soils to sequester atmospheric CO2. In this study we evaluated the influence of six cropping systems on SOC at the Wisconsin Integrated Cropping System Trial (WICST) over a 20-year period. Analysis of SOC on either a concentration or mass per volume of soil basis indicated a significant decline across all of the systems at WICST. While the rotationally grazed pasture system sequestered carbon (C) in the surface 15 cm these gains were offset by losses at depth. Both no-till (NT) practices and inclusion of perennial crops reduced SOC loss, but neither resulted in C sequestration in the soil profile. Results from this study demonstrate the importance of (i) comparing current and initial soil samples when evaluating SOC sequestration and (ii) evaluating SOC changes throughout the soil profile. The losses of SOC at depths below the plow layer point to either a lack of C input from roots, increased oxidative loss at these depths or both. Published by Elsevier B.V.