水土保持通报2012，Vol.32Issue(1)：1-4,13,5.
水旱轮作条件下免耕土壤有机碳变化特征研究
Change of Soil Organic Carbon Under No-tillage Paddy-Upland Rotation
摘要
Abstract
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.关键词
水旱轮作/免耕/水稻土/有机碳Key words
paddy-upland rotation/no-tillage/paddy soil/organic carbon分类
农业科技引用本文复制引用
何淑勤,郑子成,李廷轩,宫渊波..水旱轮作条件下免耕土壤有机碳变化特征研究[J].水土保持通报,2012,32(1):1-4,13,5.基金项目
“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” （）
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” （）
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” （）
