植物营养与肥料学报2011，Vol.17Issue(4)：898-905,8.
长期施肥和秸秆还田对红壤水稻土氮素分布和矿化特性的影响
Effects of long-term fertilization and straw returning on distribution and mineralization of nitrogen in paddy soils in subtropical China
摘要
Abstract
To clarify the effects of long-term fertilization and straw returning on nitrogen cycle of paddy soil ecosystem and the ways of maintaining soil nitrogen supplying potentials,a long-term fertilization experiment of paddy soils was setup in Taoyuan country,Hunan province from 1990.Distributions of soil nitrogen and C/N ratio in soil profiles,soil nitrogen mineralization curves and differences under different temperatures,and relationship between cumulative mineralization and effective accumulated temperature were studied.The results show that nitrogen accumulations in soil profiles are significantly improved under the long-term amendments of chemical fertilizer or crop straw,especially in 0-20 cm soil layer,and effects are better with combined application of fertilizer and straw.Curves of soil mineral nitrogen and cumulative mineralization are similar under the two temperatures.Soil mineralization rates at 10℃ may require more time to reach stable state those at 30℃;Compared with the 10℃ treatments,significant differences of all treatments are found at 30℃,and nitrogen cumulative mineralization at 30℃ during 56 d is about two times of 10℃.Higher cumulative mineralization is found in the NP（chemical N,P） and NP＋C（chemical N,P ＋ straw） treatments,demonstrates that a more contributive effect of crop straw and fertilizer than chemical fertilizer only.The relationship between cumulative mineralization and effective accumulated temperature well fit the effective accumulated temperature model（EATM）（p0.01） in all treatments at 30℃,and the k values are similar to those of EATM in chemical fertilizer treatments and CK,but increasing of k is found in the straw and fertilizer combined treatments.The NPK＋C treatment（chemical N,P,K ＋ straw） has higher mineralization potential and nutrient supplying capacity.Decrease of absolute values of n in EATM are found in the straw and fertilizer combined treatments,demonstrates that cumulative mineralization of these treatments maintain a stable range with incubation time.关键词
秸秆还田/施肥/水稻土/氮素/温度/矿化Key words
straw returning/fertilization/paddy soil/nitrogen/temperature/mineralization分类
农业科技引用本文复制引用
马力,杨林章,肖和艾,殷士学,夏立忠,李运东,刘国华..长期施肥和秸秆还田对红壤水稻土氮素分布和矿化特性的影响[J].植物营养与肥料学报,2011,17(4):898-905,8.基金项目
国家自然科学基金重点项目 （）
中国科学院知识创新工程重要方向项目（KZCX2-YW-407）资助 （）
