土壤学报2009，Vol.46Issue(6)：1050-1058,9.
长期不同施肥处理对水稻土有机碳分布变异及其矿化动态的影响
EFFECTS OF LONG TERM FERTILIZATION ON DISTRIBUTION AND MINERALIZATION OF ORGANIC CARBON IN PADDY SOIL
摘要
Abstract
Based on a 26-year long fertilization experiment in paddy field, effects of fertilization on distribution, density and mineralization of organic carbon in soil profiles in paddy field were studied. Results show: 1) Long term fertilization significantly increased organic carbon content in the top soil, and Treatments MR (application of organic manure plus return of crop straws) demonstrated a more contributive effect than Treatments CF (application of chemical fertilization alone) on organic carbon accumulation in the top soil. Organic carbon content in the 10～30 cm soil layers of Treatments CF and in the 20～40 cm soil layers of Treatments OM (organic manure) was relatively stable. 2) In the 0～25 cm and 0～50 cm soil layers, organic carbon density was found higher in Treatments OM than in Treatments CF, the highest in Treatments MNP and CNPK, and in Treatment CRN than in Treatment MRN. Compared with CK, Treatment C0 (no fertilization), all the other treatments varied more greatly in organic carbon in the 0～25 cm and 25～50 cm soil layers, Treatments OM did more than Treatments CF, and Treatments CNP and MNPK the most. 3) Organic carbon mineralization reached the peak in the first 2～4 days, and gradually leveled off in the 3 weeks that followed. The rate was higher in Treatments OM than in Treatments CF, with average mineralization rates varying in the range of CO2 55.36～75.46 ml kg-1 d-1 and stable mineralization rates in the range of CO2 10～20 ml kg-1 d-1. In the eight weeks of incubation, Treatments OM were always higher than Treatments CF in cumulative mineralization and Treatment MRN was the highest. The total mineralization intensity and stable mineralization rate remained stable in all the treatments.关键词
长期施肥/水稻土/有机碳/分布/变异/矿化Key words
Long term fertilization/Paddy soil/Organic carbon/Distribution/Variation/Mineralization分类
农业科技引用本文复制引用
马力,杨林章,慈恩,程月琴,王岩,沈明星,殷士学..长期不同施肥处理对水稻土有机碳分布变异及其矿化动态的影响[J].土壤学报,2009,46(6):1050-1058,9.基金项目
国家重点基础研究发展规划项目(2005CB121108)和中国科学院知识创新工程重要方向项目(KZCX2-YW-407)资助 （2005CB121108）
