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选取湖南双季稻田为研究对象,采用静态箱-气相色谱法对晚稻期间秸秆还田配施减量化肥(DNPK+RS)和施化肥(NPK)处理下后季早稻田(2009年)的CH4和N2O排放通量进行观测。结果表明,在早稻田等量化肥条件下,DNPK+RS比NPK增加早稻田CH4排放的81%,减少N2O排放的53%。早稻产量表明,DNPK+RS显著低于NPK(P<0.05)。晚稻期间以秸秆还田来代替部分化肥,会降低次年早稻的有效穗数和肥料增产效应。DNPK+RS处理的单位产量的全球增温潜势为NPK的2倍。秸秆还田应该重视与化肥的搭配比例,否则会降低水稻产量,同时增加下季早稻的温室效应。
In this paper, Hunan double cropping paddy field was chosen as the research object, and the effects of applying DNPK + RS and NPK on the CH4 N2O fluxes were observed. The results showed that DNPK + RS increased 81% of CH4 emissions in early rice paddy and reduced N2O emissions by 53% compared with NPK under the same amount of chemical fertilizer in the early rice fields. The yield of early rice showed that DNPK + RS was significantly lower than that of NPK (P <0.05). During the late rice to straw instead of part of the chemical fertilizers, will reduce the next year, the effective panicles of early rice and fertilizer yield effect. The global warming potential per unit production of DNPK + RS is twice that of NPK. Straw should pay attention to the proportion of fertilizer with the ratio, otherwise it will reduce the yield of rice, while increasing the next season’s early rice greenhouse effect.