农业环境科学学报2013，Vol.32Issue(1)：36-42,7.DOI:10.11654/jaes.2013.01.006
有机肥分解及其对土壤有机碳矿化影响的模拟研究
A Simulation Study on Decomposition of Organic Fertilizers and Its Effects on Soil Organic Carbon Mineralization
摘要
Abstract
Dynamics of organic carbon in commercial organic fertilizer, rapeseed cake fertilizer, and straw compost under simulated culture conditions were studied in soil respiration bottles and their effects on soil organic carbon mineralization were determined. It was found that the decomposition of three organic fertilizers showed different characteristics at culture conditions. The decomposition rate of rapeseed cake fertilizer and straw compost underwent a rapid increasing stage which was followed by a quick declining during 25 days after they were mixed with soil. Such a trend was more significant in rapeseed cake fertilizer with lower C/N ratio. Nevertheless, the decomposition rate of commercial organic fertilizer which has higher C/N ratio than the others was slower. Total amount of mineralized organic carbon in soil with different fertilizer treatment followed the sequence of rapeseed cake fertilizer > straw compost > commercial organic fertilizer, with statistical significance of P<0.01. The data were fitted with the Soil-C model. It was determined that the fractions of readily decomposed components in commercial organic fertilizer, rapeseed cake fertilizer, and straw compost were 0.22, 0.57, and 0.47, respectively. The first order kinetic constants Ku K2, Ks were determined to be 0.019, 0.97xl0-3, and 0.80xl0-3(d-1), respectively. The decomposition ratio increased with the increased nitrogen content and the rapeseed cake fertilizer with highest nitrogen content among three fertilizers had the highest decomposition ratio. The comparison between experimental data and model simulation revealed that mixing commercial organic fertilizer with rapeseed cake fertilizer at ratio of 2=1 significandy enhanced its decomposition (P<0.01). Similar enhancement was also observed when straw compost was mixed with rapeseed cake fertilizer at ratio of 1:1 (P<0.01).关键词
有机肥料/土壤有机碳矿化/有机种植/模型模拟Key words
organic fertilizer/ soil organic carbon mineralization/ organic farming/ modeling分类
农业科技引用本文复制引用
汪张懿,宗良纲,褚慧,谢少华,杨旎,罗敏..有机肥分解及其对土壤有机碳矿化影响的模拟研究[J].农业环境科学学报,2013,32(1):36-42,7.基金项目
江苏省科技支撑计划(BE2009313-2) （BE2009313-2）
江苏省农业科技自主创新资金(CX(11)3042) （CX(11）
