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本文研究了延边地区不同开垦年限及不同施肥类型下稻田生长季CO_2的排放特征,研究表明,不同开垦年限稻田CO_2排放能力差异明显,随开垦年限延长,稻田CO_2排放量则明显下降,80 a稻田CO_2排放量显著高于120 a稻田。稻田CO_2排放季节特征受肥料类型的影响较大,单施有机肥促进了水稻分蘖期及黄熟期稻田CO_2排放速率,而单施化肥在水稻分蘖期、孕穗末期及黄熟期均表现出较强的CO_2排放能力,化肥与有机肥配施措施促进了分蘖-拔节期CO_2排放速率。全生长季单施有机肥、有机肥配施化肥和单施化肥处理的CO_2月排放量均值分别为229.60 g·m~(-2)、209.49 g·m~(-2)和137.14 g·m~(-2),施用有机肥可以明显促进稻田CO_2的排放。
In this paper, the CO 2 emission characteristics of paddy fields under different reclamation years and different types of fertilization were studied. The results showed that the CO 2 emission capacities of paddy fields with different reclamation years were significantly different. With the prolongation of reclamation years, the CO 2 emission of paddy fields decreased obviously. CO 2 emissions were significantly higher than 120 a paddy fields. The seasonal characteristics of CO 2 emission in paddy fields were greatly influenced by the types of fertilizers. Single application of organic fertilizers promoted the CO 2 emission rate in paddy at tillering stage and yellow paddy stage. However, the application of chemical fertilizers in paddy at tillering stage, booting stage and yellow stage showed strong CO 2 emission capacity and the combination of chemical fertilizers and organic fertilizers promoted the CO 2 emission rate at tillering-jointing stage. In the whole growing season, the average monthly values of CO 2 emission in single organic manure, organic manure and chemical fertilizer were 229.60 g · m -2, 209.49 g · m -2 and 137.14 g · m ~ (-2). The application of organic fertilizer can obviously promote the CO 2 emission in paddy field.