Effects of cropping systems on nitrous oxide emissions from paddy soils during the rice-growing season

Abstract

Abstract: Cropping systems influence nitrous oxide (N₂O) emissions from agricultural soils.Effects of 3 rice-based cropping systems on N₂O emissions from paddy soils in pot experiment were investigated with closed chambers in triplicate.The results demonstrated that the seasonal N₂O emission rate of the rice pot under rice-wheat cropping system was obviously higher than that of the early rice pot under double rice-wheat system, being 4.21 and 2.17 kg·hm^-2, respectively.No distinct difference was observed between the seasonal average fluxes, which were 116.9 and 117.6 μg·m^·2-h^-1 respectively.Both of above mentioned seasonal average fluxes were greatly higher than that of the late rice pot under early rice-late rice-wheat cropping system and of rice pot under rice-flooding fallow system, being 67.0 and 42.1 μg·m^-2·h^-1 respectively.More than 91% of the seasonal emission was focused on the first half growing period both in the rice season in rice-wheat system and in the early rice season in double rice-wheat system in which the previous cropping was upland wheat.91% of the seasonal emission was focused on the water drainage period including the mid-season aeration and final drainage in the late rice season in double rice-wheat system in which the previous cropping was lowland rice.The results implied that cropping system and water status of previous cropping impacted N₂O emission from paddy soil.

CLC Number:

XIONG Zhengqin, XING Guangxi, SHI Shulian, DU Lijuan . Effects of cropping systems on nitrous oxide emissions from paddy soils during the rice-growing season[J]. Chinese Journal of Applied Ecology, 2003, (10): 1761-1764.

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