土壤学报2013，Vol.50Issue(3)：433-440,8.
中国保护性耕作农田土壤有机碳变化速率研究——基于长期试验点的Meta分析
A META-ANALYSIS OF LONG-TERM EXPERIMENT DATA FOR CHARACTERIZING THE TOPSOIL ORGANIC CARBON CHANGES UNDER DIFFERENT CONSERVATION TILLAGE IN CROPLAND OF CHINA
摘要
Abstract
Conservation tillage of farmlands is very important to soil building,guarantee of food security and mitigation of global warming.A total of 303 sets of field experiment data was collected from 157 long-term (1980-2012)conservation tillage experiment sites for meta-analysis to characterize quantitatively tranchangestion of SOC (soil organic carbon) in the topsoil (0 ～ 15cm for paddy and 0 ～20cm for upland) of farmlands under conservation tillage.Results show that the practices of conventional tillage plus straw incorporation (CTS),no tillage (NT),and no tillage plus straw incorporation (NTS) significantly increased SOC content in the topsoil with a relative change rate (RC) being 0.22,0.35,and 0.52 g kg-1a-1,respectively,as compared with the practice of conventional tillage (CT).The effect was more significant in paddy fields than in uplands and in farmlands under the double cropping system than in those under the single cropping system.It seems,however,that SOC accumulation and its amplitude is not fully related to the initial content of organic carbon in the soil.The SOC increase rate in short-term field experiments (≤5a) is about 1.75 times as high as that in long-term ones (＞5a).It is,therefore,possible to overestimate SOC sequestrating potential of the conservation tillage practices just based on short-term field experiments.关键词
保护性耕作/农田土壤/长期试验/有机碳变化/Meta分析Key words
Conservation tillage/Cropland soil/Meta-analysis/Long-term field experiments/Dynamics of soil organic carbon分类
农业科技引用本文复制引用
田康,赵永存,邢喆,孙维侠,黄标,胡文友..中国保护性耕作农田土壤有机碳变化速率研究——基于长期试验点的Meta分析[J].土壤学报,2013,50(3):433-440,8.基金项目
中国科学院战略性先导科技专项—应对气候变化的碳收支认证及相关问题(XDA05050509)和中国科学院知识创新工程重要方向项目(KZCX2-EW-QN404)资助 （XDA05050509）
