摘要
利用保护性耕作长期定位试验平台，研究了小麦一玉米轮作条件下连续5年实施免耕与秸秆还田对农田潮土团聚体组成、团聚体中有机碳含量的影响。结果表明：相比于常规翻耕，常规翻耕＋秸秆还田、免耕、免耕＋秸秆还田处理下〉5mm粒级机械稳定性团聚体含量显著提升，增加比例分别为16．62％、16．05％、44．23％；而免耕、免耕＋秸秆还田能显著提升5～2mm粒级水稳性团聚体含量，提升比例分别为29．81％和64．28％，同时团聚体稳定率也有一定的提高；实施免耕能显著提高5～2、2～1mm粒级水稳性团聚体中有机碳含量；除常规翻耕＋秸秆还田处理下2～1mm粒级外，秸秆还田对各粒级团聚体中有机碳含量均有不同程度的提升作用。
In this study, effects of five-year no-tillage and straw returning on composition and organic carbon content of soil aggregates in farmland fluvo-aquic soil were investigated in a long-term experiment site of conservation tillage. The research results showed that： compared with the conventional tillage treatment, content of 〉5 mm mechanically stable aggregates under conventional tillage＋straw returning, no-tillage, no-tillage＋straw returning treatments were significantly improved, the proportions were respectively： 16.62%, 16.05%, 44.23%; And no-tillage and no-tillage＋straw returning could significantly improve content of 5-2 mm water stable aggregates, the proportions were respectively： 29.81% and 64.28%, stabilities of soil aggregates were also improved to some extent; Implementing no-tillage could significantly improve organic carbon content of 5- 2 mm, 2-1 mm water stable aggregates; Except 2-1 mm under conventional tillage＋straw returning treatment, straw returning improved organic carbon content of all the size water stable aggregates inordinately.
出处
《土壤》
CAS
CSCD
北大核心
2014年第1期35-40,共6页
Soils
基金
国家重点基础研究发展计划(973计划)项目(2011CB100504)
中国科学院知识创新重要方向项目(KZCX2-YW-JS408)
中国科学院重点部署项目(CXJQ120112)
公益性行业(农业)科研专项经费项目(201203030-06)资助
关键词
保护性耕作
潮土
团聚体
有机碳
Conservation tillage, Fluvo-aquic soil, Aggregate, Organic carbon
