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资源科学 2002
DIFFERENT CHARACTERISTICS OF GREENHOUSE GAS EMISSION FROM RICE PADDY FIELD AND PRECISION FERTILIZATION
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Abstract:
Main concern of this paper is devoted to exploring the relationship between different characteristics of greenhouse gas emission from rice paddy field and precision fertilization. The field experiment results showed that CH 4 and N 2O emission flux differed significantly by different fertilization treatment( 0kg N.hm -2, 90kg N.hm -2, 180kg N.hm -2, 270kg N.hm -2, 360kg N.hm -2). The methane emission flux in different treatment plot had obviously difference and the maximum gap reached 15.8mg.m -2hr -1. In general, methane emission rate decreased with the increase of nitrogen fertilizer volume (R=0.88). The methane emission flux in a day changed from 1 to 6.6 times. N 2O emission flux decreases with the growth of fertilization volume. Based on different characters of greenhouse gas emission from rice paddy field, taking grain yield into consideration, it will provide a threshold for nitrogen fertilizing amount, the fitting fertilization volume was 270kg hm -2. To present precision fertilization, it is no doubt that many factors, such as physical and chemical feature and nutrient demand of rice plant and so on, should be taken into account. Therefore, the research of different characteristics of greenhouse gas emission from paddy field is expected to provide environmental information for precision fertilization.
