Nonlinear response of soil ammonia emissions to fertilizer nitrogen

文献类型： 外文期刊

第一作者： Jiang, Yu

作者： Jiang, Yu;Deng, Aixing;Zhang, Weijian;Jiang, Yu;Bloszies, Sean;Huang, Shan;Huang, Shan

作者机构：

关键词： Ammonia;Fertilizer response;Nonlinear;Emission factor

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.432； 五年影响因子：6.332 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Ammonia (NH3) is an important atmospheric pollutant that threatens ecosystem and human health. Synthetic nitrogen (N) fertilizer applications are a major source of atmospheric NH3. Most of current bottom-up estimates assume that the NH3 emission response to increasing N application rates is linear, and thus constant emission factors (EFs) are used. However, increasing evidence suggests that NH3 emissions increase exponentially with increasing N inputs. In the present study, we conducted a meta-analysis to generalize the relationship between N inputs and NH3 emissions. Overall, the change in EF per unit of additional N fertilizer input (Delta EF) was positive from 70 experiments with at least three N application rates, suggesting that NH3 emissions in response to increasing N additions grow at a rate higher than linear. Compared to our Delta EF model, the 10% EF model used by Intergovernmental Panel on Climate Change overestimated NH3 emissions when fertilizer N is applied at low levels, but underestimated NH3 emissions when N is applied in excess. Therefore, our results suggest that replacing the constant EF with the N-rate-dependent EF could improve the accuracy of NH3 emission estimates.

分类号： S15

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