深耕和秸秆还田对土壤微生物数量的影响

摘要

Through two -year field location test in two places,the effects of three cultivation ways on soil microorganism quantity were studied,including conventional tillage with straw returning (CT),deep till-age with straw returning (DT)and deep tillage with no straw returning treatment (DNT).The results showed that deep tillage and straw returning both increased the soil microorganism quantity.Contrasting with CT and DNT treatment,the numbers of bacteria,fungi and actinomycetes of DT treatment increased by 1 0.8%, 23.9%,31 .0% and 56.1 %,85.3%,1 42.6% respectively.Deep tillage mainly affected the microorganism quantities in middle and lower soil layers,and straw returning affected those in the whole soil layers.%通过两地两年田间定位试验，对比研究常规耕作并秸秆还田（CT）、深耕并秸秆还田（DT）、深耕但秸秆不还田（DNT）三种耕作方式对土壤微生物数量的影响。结果表明：深耕和秸秆还田均能够增加土壤微生物数量，DT 处理耕层土壤细菌、真菌、放线菌数量显著高于 CT 处理和 DNT 处理，分别增加10．8％、23．9％、31．0％和56．1％、85．3％、142．6％。深耕主要增加耕层中下部土壤微生物数量，而秸秆还田能够增加整个耕层土壤微生物数量。