摘要
1993～1994年在中国科学院红壤生态试验站通过田间试验研究了丘陵区稻田N2O排放的特点结果表明稻田N2O排放主要集中在水分落干期间，淹水状态下几乎没有N2O排放。由于早稻稻草还田，晚稻稻田N2O排放量即使在水分落干期间也不高。稻田N2O排放员随地形降低而逐渐增加，1993～1994年两年中被底、坡腰和坡顶稻田水稻生长期平均N2O-N排放通量分别为10．90、5．60和2．11μg／（m2·h）。
Field experiment was carried out in Red Soil Ecological Experimental Station, Chinese Academy of Sciences to study characteristics of N2O edrissi0ns from paddy fields in hilly area. The results showed that N2O edrission mainly occurred during the drying period of soil, while there was almost no N2O emission during the flooding period. Due to early rice straw app1ication, N2O emission from late rice field was low, even during the drying period of soil. Generally, N2O flux increased with the positions of paddy fields from the top to the bottom in a sIope in hilly aLrea. Mean N2O-N fluxes of 4 rice-growing seasons from paddy fields located in the bottom, driddle and top of a slope land were 10.94, 5.60 and 2. 11 μg/(m2·h) respectively.
出处
《土壤与环境》
CSCD
1999年第4期266-270,共5页
Soil and Environmental Sciences
基金
国家自然科学基金!48970039
关键词
稻田
N2O排放
地形
paddy field
N_2O emission, topography
