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Inhibition of methane emissions from Chinese rice fields by nitrogen deposition based on the DNDC model

机译：基于DNDC模型的氮沉积抑制中国稻田的甲烷排放量

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摘要

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 < 0.01). The largest reduction in the CH4 flux of single-cropping rice was mainly concentrated in AEZ (agroecological zone) 6A and AEZ 7, while the largest reduction for double-cropping rice was mainly distributed in the Poyang Lake Basin and Dongting Lake Basin. It should be noticed that the net response of CH4 emissions to N deposition ( - 0.07 and - 0.14 kg CH4 ha(-1 )kg(-1) N for single- and double-cropping rice, respectively) was greater than that to N fertilizers (- 0.05 kg CH4 ha(-1) kg(-1) N) under the same water management practices, which mainly because the nitrate nitrogen in N deposition increases the soil redox potential, thus inhibiting the production of CH4. These results provide a new understanding of the ecological effect of N deposition on agricultural ecosystems.
机译：氮（N）沉积在中国迅速增加，其对生态系统的影响受到广泛关注。在本研究中，使用经过验证的DNDC（脱氮 - 分解）模型评估了中国稻米稻田（CH4）甲烷（CH4）排放量增加的净效应。结果表明，N沉积产生水稻生物质的略微增加，弱抑制CH4排放，在稻田中的电流N肥料应用实践（过量氮肥）下。全国性地，N沉积可通过0.04 Tg Yr（-1）减少总CH4排放量。 CH4排放减少1.38和1.69公斤CH4 HA（-1）YR（-1）（-1）（-1）中期排水制度的中间和双重稻米的中期排水制度， 分别。 n沉积显示出显着影响CH4排放减少（r = 0.86和0.74，分别为p <0.01）。单种水稻CH4通量的最大减少主要集中在AEZ（农业生态区）6A和AEZ 7中，而双方种植的最大减少主要分布在鄱阳湖盆地和洞庭湖盆地。应该注意的是，对于单次和双种植稻的N沉积（ - 0.07和-0.14kg（-1）kg（-1）kg（-1）kg（-1）kg（-1）n的净响应大于n在相同的水管理实践下，肥料（ - 0.05kg CH4 ha（-1）kg（-1）kg（-1）n），这主要是因为n沉积中的硝酸盐氮来增加土壤氧化还原潜力，从而抑制CH4的产生。这些结果对N沉积对农业生态系统的生态效应提供了新的认识。

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