典型潮土N2O排放的DNDC模型田间验证研究

利用典型潮土N2O排放的田间试验数据对脱氮-分解模型（DNDC）及其参数进行验证。结果表明，DNDC模型能较好地模拟田间实测到的冬小麦、夏玉米季土壤湿度和土壤日平均地表温度的动态变化。小麦和玉米季土壤N2O排放通量与土壤水分（WFPS）呈显著正相关，与土壤温度相关性不大。田间实测到的N2O排放高峰主要受降水和施肥的影响，在N2O排放峰的峰值和出现时间上模拟值与实测值较接近，但准确地捕捉N2O季节性的排放通量仍需对模型进行修正。通过比较施肥、土壤和田间管理等输入参数的改变对DNDC模型进行灵敏性分析，氮肥用量、施肥次数、土壤初始无机氮含量和土壤质地的改变对土壤N2O排放量均很敏感，其中氮肥用量和施肥次数的改变最为敏感。基于当地土壤特性和田间管理的校正，DNDC模型为评价农田生态系统N2O的排放提供了强有力的工具。

Field validation of DNDC model for nitrous oxide emission from typical fluvo-aquic soils

The validities of DeNitrification-DeComposition(DNDC) model and the simulation parameters were examined by using field experiment data obtained from typical fluvo-aquic soils at Hengshui experiment station,Hebei Province.The results show that the DNDC model could be well used for simulating the temporal variations of soil moisture and mean daily temperature at soil surface during winter wheat/summer corn growing seasons.There is significantly positive correlation between soil N2O flux and soil moisture(wate...