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文中试图以不同施氮处理下稻田温室气体排放的时空差异性为依据 ,为精准施肥提供环境方面的信息。通过实验观测 ,研究了不同施氮处理条件下 ,稻田温室气体CH4和N2 O日排放的差异性。施氮量不同的小区 ,CH4排放强度有很大差异 ,最大差值为 1 5 8mg·m- 2 h- 1 ,CH4排放强度随着施氮量的增加而减少 (R =0 88)。甲烷排放的日变化幅度也较大 ,在 1～ 6 6倍左右。在不同施氮水平下 ,N2 O则随着施氮量的增加 ,排放通量逐渐减少。如果以观测的温室气体排放强度变化为基础 ,同时考虑粮食产量的变化规律 ,施氮量为 2 70kg·hm- 2 时 ,温室气体排放量较低。实际上 ,精准施肥需要考虑诸多因素如土壤的理化性质、水稻不同生长季节的养分需求等等
The paper tries to provide environmental information for precision fertilization based on the spatial and temporal variability of greenhouse gas emissions under different nitrogen treatments. Through experiment observation, the difference of day emission of greenhouse gases CH4 and N2 O under different nitrogen application conditions was studied. The emission intensity of CH4 varies greatly with different nitrogen rates. The maximum difference is 158 mg · m-2 h-1. The emission intensity of CH4 decreases with the increase of nitrogen application rate (R = 0 88). The daily variation of methane emission is also larger, about 1 ~ 6 6 times. Under different nitrogen levels, the flux of N2 O gradually decreased with the increase of nitrogen application rate. When the amount of nitrogen applied is 2 70 kg · hm-2, the greenhouse gas emissions will be lower if we take the observed changes in the intensity of greenhouse gas emissions as the basis, taking into account the changes in grain yield. In fact, precision fertilization need to consider many factors such as the physical and chemical properties of the soil, the nutrient needs of rice in different growing seasons, etc.