论文部分内容阅读
针对当前旱田耕地土壤有机质含量下降,影响土壤生产力的实际,探讨秸秆还田后不同年限对土壤腐殖质组分的影响。研究结果表明,不同剂量秸秆还田后第二年和第三年土壤有机碳(SOC)含量0~20 cm(表层)差异不显著,20~40 cm(亚表层)第三年显著高于第二年;土壤腐殖质各组分有机碳的含量均是0~20 cm大于20~40 cm,但随着秸秆施用量的增加,差异减小;秸秆还田第三年和第二年相比,FA含量降低,HA、Hu含量以及PQ值都有所增加,表明秸秆还田三年土壤有机碳含量增加,土壤腐殖化程度增加。研究结果对提高土壤有机质含量,提升地力具有指导意义。
In view of the fact that the content of soil organic matter in dryland soil is decreased and the soil productivity is affected, the influence of different years on soil humus composition after straw returning is discussed. The results showed that there was no significant difference in soil organic carbon (SOC) content between 0 and 20 cm (surface layer) in the second year and the third year after returning straw to soil at different dosages. The third to the 20-40 cm (subsurface) In two years, the content of organic carbon in each component of soil humus was 0-20 cm more than 20-40 cm, but with the increase of straw application, the difference decreased. Compared with the second year, FA content decreased, HA, Hu content and PQ values increased, indicating that three years after straw returning to soil organic carbon content increased soil humification increased. The results of this study are instructive for improving soil organic matter content and soil fertility.