Impacts of 9 years of a new conservational agricultural management on soil organic carbon fractions
| 第一作者： |
王全英 |
| 英文第一作者： |
Wang, Q. Y. |
| 联系作者： |
刘景双 |
| 英文联系作者： |
Liu, J. S. |
| 发表年度： |
2014 |
| 卷： |
143 |
| 摘要： |
Labile soil organic carbon pools are widely regarded as valuable indicators of changes in soil C sequestration pools and dynamics induced by different soil management practices. The objective of this study was to evaluate how a new conservational agricultural management (NCAM), which has been proved to be an effective pattern to increase corn yield, affects soil organic C (SOC) and labile SOC pools after a 9-year experiment in Northeast China. Narrow-wide row (1.70 m wide row and 0.30 m narrow row, corn is sowed in the narrow row with two lines), no-till, residue retention, change of ridge direction, and fallow are adopted for NCAM. Soil under conventional agricultural management (CAM) was also studied to be as a comparison. Soil samples were taken from 0-20 to 20-40 cm depths. The results showed that no significant difference was found for SOC between the two managements for both depths, indicating that SOC is a too gross measurement. Soil labile organic C fractions: microbial biomass C, hot-water extractable organic C and permanganate oxidizable C (KMnO4-C) contents were significantly higher under NCAM compared to CAM for both depths, reflecting the build-up of labile C pools under NCAM. In addition, of the three C fractions, KMnO4-C was the most sensitive indicator of changes in SOC induced by different agricultural management regimes. Our results implied that the application of NCAM is important to soil C sequestration and improving soil quality. |
| 刊物名称： |
Soil & Tillage Research |
| 参与作者： |
王洋，王起超，刘景双 |
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