[Effects of nitrogen management on soil microbial community structure at different growth stages under straw returning in paddy soils]

Effects of different nitrogen application methods on microbial community structure of paddy soil at different rice growth stages were examined using phospholipid fatty acid analysis (PLFA) and Biolog technique. There were four treatments, no straw returning or fertilization (CK), straw returning +urea with the proportions of after wheat harvest, before rice transplanting, tillering stage and booting stage being 0:6:2:2 (T运用磷脂脂肪酸(phospholipid fatty acid,PLFA)和Biolog方法,研究了秸秆不还田不施肥(CK)、秸秆还田+尿素1(N分配:麦收后∶水稻移栽前∶分蘖期∶孕穗期=0∶6∶2∶2,T