降雨和土壤湿度对贵州旱田土壤N_2O释放的影响  

Effects of precipitation and soil moisture on N-2O emissions from upland soils in Guizhou.

作　　者：徐文彬[1] 刘广深[1] 刘维屏[1] 

机构地区：[1]浙江大学环境科学研究所,杭州310027

出　　处：《应用生态学报》2002年第1期67-70,共4页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金资助项目 ( 4 9873034;40 0 730 34)

摘　　要：以南方亚热带代表性旱田土壤 贵州玉米 油菜轮作田、大豆 冬小麦轮作田和休耕地为观测对象 ,研究土壤N2 O释放通量季节变化与降雨和土壤湿度的关系 .同时 ,采用DNDC模型定量探讨了未来降雨量变化对土壤N2 O释放的潜在影响 .结果表明 ,降雨与N2 O释放峰间存在明显的驱动 响应关系 ,N2 O释放通量与降雨量和土壤湿度间存在正相关性 .模型检验结果表明 ,夏秋季土壤N2 O释放通量与降雨量变化呈正相关 ,而降雨量的大幅度增加或下降将引起冬春季土壤N2 O释放通量的微弱下降 .Soils of corn-rape seed rotation,soybean-winter wheat rotation and fallow land in Guizhou were representatively selected to study effects of precipitation and soil moisture on N-2O emissions.Furthermore,DNDC model was used to assess the potential effects of variations in precipitation in future on N-2O emissions from above lands.The results indicated that N-2O emission pulses were obviously driven by rainfall and N-2O fluxes were correlated positively with precipitation and soil moisture.The results from DNDC modeling showed that N-2O fluxes from soils in summer and autumn would be correlated positively with precipitation,but N-2O fluxes in winter and spring would slightly decrease with great change of precipitation.

关 键 词：N2O释放 降雨 土壤湿度 旱田土壤 DNDC模型 贵州 

分 类 号：X144[环境科学与工程—环境科学]