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用密闭箱法同时研究了广州地区晚稻田CH4和N2 O的排放通量。结果表明 ,连续淹水、常规连作和水旱轮作等 3种处理的CH4平均排放通量分别为 1 7 63、2 84和0 36mg·m- 2 ·h- 1 ,而N2 O的平均排放通量分别为 6 74、1 1 69和 55 0 7μgN2 O N·m- 2 ·h- 1 ,表明稻田连续淹水显著增加CH4的排放而降低N2 O的排放。水旱轮作降低CH4排放而提高N2 O的排放 ,说明稻田CH4和N2 O排放之间存在着消长关系。讨论了这 2种温室气体排放的影响因素 ,并初步分析了它们对温室效应的相对贡献。
The closed chamber method was used to study the fluxes of CH4 and N2 O in late rice fields in Guangzhou at the same time. The results showed that the average CH4 fluxes were 1 7 63, 2 84 and 0 36 mg · m-2 · h-1, respectively, for 3 treatments including continuous flooding, conventional continuous cropping, 674,1 1 69 and 55 0 7μgN2 ON · m-2 · h-1, respectively, indicating that continuous flooding of paddy fields significantly increased the emission of CH4 and reduced the emission of N2 O. Drought and drought rotation reduced CH4 emissions and increased N 2 O emissions, suggesting a correlation between CH 4 and N 2 O emissions in paddy fields. The influencing factors of these two kinds of greenhouse gas emissions are discussed, and their relative contributions to the greenhouse effect are analyzed.