应用生态学报2012，Vol.23Issue(1)：81-86,6.
有机无机肥配施提高麦-稻轮作系统中水稻氮肥利用率的机制
Mechanisms for the increased fertilizer nitrogen use efficiency of rice in wheat-rice rotation system under combined application of inorganic and organic fertilizers
摘要
Abstract
A pot experiment was conducted to study the effects of combined application of organic and inorganic fertilizers on the nitrogen uptake by rice and the nitrogen supply by soil in a wheat-rice rotation system, and approach the mechanisms for the increased fertilizer nitrogen use efficiency of rice under the combined fertilization from the viewpoint of microbiology. Comparing with applying inorganic fertilizers, combined application of organic and inorganic fertilizers decreased the soil mi-crobial biomass carbon and nitrogen and soil mineral nitrogen contents before tillering stage, but increased them significantly from heading to filling stage. Under the combined fertilization, the dynamics of soil nitrogen supply matched best the dynamics of rice nitrogen uptake and utilization, which promoted the nitrogen accumulation in rice plant and the increase of rice yield and biomass, and increased the fertilizer nitrogen use efficiency of rice significantly. Combined application of inorganic and organic fertilizers also promoted the propagation of soil microbes, and consequently, more mineral nitrogen in soil was immobilized by the microbes at rice early growth stage, and the immobilized nitrogen was gradually released at the mid and late growth stages of rice, being able to better satisfy the nitrogen demand of rice in its various growth and development stages.关键词
麦-稻轮作/水稻/有机无机肥配施/土壤微生物生物量碳氮/氮肥利用率Key words
wheat-rice rotation/ rice/ combined application of inorganic and organic fertilizers/ soil microbial biomass carbon and nitrogen/ nitrogen use efficiency分类
农业科技引用本文复制引用
刘益仁,李想,郁洁,沈其荣,徐阳春..有机无机肥配施提高麦-稻轮作系统中水稻氮肥利用率的机制[J].应用生态学报,2012,23(1):81-86,6.基金项目
国家重点基础研究发展计划项目(2007CB109304)和农业部公益性行业科研专项(201103004)资助. （2007CB109304）
