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《Bulletin of Soil and Water Conservation》 2012-01
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Change of Soil Organic Carbon Under No-tillage Paddy-Upland Rotation

HE Shu-qin1,ZHENG Zi-cheng2,LI Ting-xuan2,GONG Yuan-bo1(1.Forestry College,Sichuan Agricultural University,Ya'an,Sichuan 625014,China; 2.College of Resources and Environmental Science,Sichuan Agricultural University,Ya'an,Sichuan 625014,China)  
Change of soil organic carbon under no-tillage paddy—upland rotation was studied through filed investigation and laboratory analysis.Results showed that with the increasing years of no-tillage,the maximum soil organic carbon occurred 5 to 6 years after water-cultivation and dry-cultivation.The content of soil organic carbon under no-tillage was significantly different from that under conventional tillage.The content of soil organic carbon within 5 cm of the surface soil was obviously higher than that in other soil layers,suggesting a certain surface accumulation phenomenon.The ontent of fulvic acid was found to be higher than the content of humic acid after water-cultivation and dry-cultivation.Ratios of soil carbon to nitrogen were from 10 to 16,which is favorable to nutrient release during organic matter decomposition.Change in organic carbon density was the same as that in soil organic carbon.The study may clarify the effect of no-tillage practices on the content of soil organic carbon and provide a theoretical basis for building a reasonable crop rotation model and a scientific guidance for promoting the use of farming methods.
【Fund】: “十一五”国家科技支撑计划项目“长江中上游西南山区退化生态系统恢复与重建技术研究”(2006BAC01A11);; 四川省教育厅重点项目“低山丘陵区退耕地水稳性团聚体演变特征及其肥力效应”(07ZA059);; 中国科学院山地灾害与地表过程重点实验室开放研究基金资助项目“水蚀过程中地表糙度演化特征及其与侵蚀的互动效应”(2008)
【CateGory Index】: S153.62
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