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研究对象 ,同步观测了整个轮作期土壤N2 O排放通量和温度的季节变化。同时 ,采用DNDC模型定量探讨了未来气温变化对土壤N2 O排放的潜在影响。结果表明 ,温度是土壤N2 O排放通量规律性日变化的最主要控制因素 ;除大豆地外 ,其他作物生长季节和休耕地的N2 O排放通量季节变化与温度之间均存在一定程度的正相关性 ,其中冬春季休耕地的N2 O排放通量与温度间存在弱指数函数关系。模型检验结果表明 ,除大豆地外 ,其余试验地的N2 O排放通量均随年均气温升高而升高 ,在冬春季 ,土壤N2 O排放通量对气温变化的敏感性强于夏秋季 ,尤其以冬春季休耕地受气温变化的影响最为显著。
Fields under corn rape rotation, soybean winter wheat rotation, and fallow in Guizhou were selected as representative sub tropical upland soils for studying seasonal variations in N 2O flux and temperature synchronously. Furthermore, DNDC model was used to assess potential effect of the variation in air temperature in future on N 2O emissions from the fields. The results indicated that temperature was the key factor controlling the diurnal regular variation in N 2O flux. Apart from that from the soybean field, N 2O fluxes from the crop fields and fallow land were positively related with the temperature, and N 2O fluxes from the fallow land in spring and winter were in exponential function with the temperature. DNDC modeling results showed, except from soybean field, N 2O fluxes from all the fields would increase with annual average temperature. The effect of temperature on N 2O fluxes would be greater in spring and winter than in summer and autumn, and from the fallow land than from the others in spring and autumn.\;
出处
《土壤学报》
CAS
CSCD
北大核心
2002年第1期1-8,共8页
Acta Pedologica Sinica
基金
国家自然科学基金资助项目 (批准号 49873 0 3 4
40 0 73 0 3 4)
中国博士后基金资助项目
