基于DNDC模型的不同秸秆还田填埋深度下农田N2O气体排放模拟

摘要

This research combined the paddy planting season data in Wujiang region,China with the DNDC model(Denitrification-Decomposi-tion model) to detect whether the DNDC could be used to simulated the N2O emission speed,annual discharge amount and discharge change tend-ency.This research also analyzed the sensitivity of the important factors which affect the N2O discharge amount.The results were as fellows:DNDC model could be used to simulate the N2O emission speed,annual discharge amount and discharge change tendency under different straw retention soil depths.The annual mean temperature,soil pH,soil organic carbon amount,fertilization amount and straw retention amount could influence the N2O gas discharge amount sensitively.%利用2013年吴江试验区水稻种植季定点、连续监测N2O气体排放量数据、气象数据、土壤理化性质等资料,运用DNDC模型(脱氮-分解模型)研究该模型是否可以预测不同秸秆还田填埋深度下N2O排放速度、排放总量和排放变化趋势,并对影响N2O排放的主要因子进行了灵敏度分析.结果表明,DNDC模型可以对不同秸秆还田填埋深度下N2O的排放速度、排放总量和变化趋势进行模拟;年平均温度、土壤pH、土壤有机碳含量、施肥量和秸秆还田量对不同秸秆还田填埋深度下N2O气体排放非常敏感.