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Inhibition of methane emissions from Chinese rice fields by nitrogen deposition based on the DNDC model
Agricultural Systems ( IF 6.6 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.agsy.2020.102919 Zhen Wang , Xiuying Zhang , Lei Liu , Shanqian Wang , Limin Zhao , Xiaodi Wu , Wuting Zhang , Xianjin Huang
Agricultural Systems ( IF 6.6 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.agsy.2020.102919 Zhen Wang , Xiuying Zhang , Lei Liu , Shanqian Wang , Limin Zhao , Xiaodi Wu , Wuting Zhang , Xianjin Huang
Abstract Nitrogen (N) deposition has rapidly increased in China, and its impact on ecosystems has received extensive attention. In the present study, the net effect of increased N deposition on methane (CH4) emissions from rice fields across China was evaluated using the validated DNDC (DeNitrification-DeComposition) model. The results showed that N deposition produces a slight increase in rice biomass and weakly inhibits CH4 emissions, under the current N fertilizer application practices (excessive N fertilizer) in paddy fields. Nationally, N deposition reduces total CH4 emissions by 0.04 Tg yr−1. CH4 emissions are reduced by 1.38 and 1.69 kg CH4 ha−1 yr−1 (accounting for 0.6% and 0.2% of the average CH4 emissions) in a mid-season drainage water regime for single- and double-cropping rice, respectively. N deposition showed significantly influence on CH4 emission reduction (R = 0.86 and 0.74 for single- and double-cropping rice, respectively, p
更新日期：2020-09-01
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