不同耕作方式和秸秆还田对麦田土壤有机碳含量的影响

通过两个生长季试验，研究了不同耕作方式和秸秆还田及其交互效应对小麦全生育期0～20 cm土壤有机碳含量的影响.结果表明：小麦不同生育时期0～20 cm土层有机碳含量呈明显的动态变化；秸秆还田各处理的有机碳含量都高于无秸秆还田处理；保护性耕作措施土壤有机碳增加量显著高于传统翻耕.除传统翻耕处理外，各处理0～10 cm土层的有机碳含量都高于10～20 cm土层，秸秆还田各处理0～10 cm土层有机碳含量表现为深松(PS)＞旋耕(PR)＞免耕(PZ)＞耙耕(PH)＞传统翻耕(PC)，而10～20 cm土层表现为传统翻耕(PC)＞深松(PS)＞旋耕(PR)＞耙耕(PH)＞免耕(PZ)，说明保护性耕作措施能提高0～10 cm土层的有机碳含量.多因素方差分析表明：耕作因素、秸秆因素和两者交互效应在不同生育期对0～20 cm土层的有机碳含量都有显著影响.

Effects of different tillage methods and straw-returning on soil organic carbon content in a winter wheat field

A two growth seasons experiment was conducted to study the effects of different tillage methods,straw-returning,and their interaction on the dynamic change of organic carbon content in 0-20 cm soil layer during the whole growth period of winter wheat.An obvious change was observed in the soil organic carbon content.Treatments with straw-returning had higher soil organic carbon content than treatments with no straw-returning,and conservation tillage induced higher soil organic carbon content than conventiona...