数字农科院2.0

Modeling denitrification nitrogen losses in China's rice fields based on multiscale field-experiment constraints

文献类型： 外文期刊

作者： Zhang H.;Adalibieke W.;Ba W.;Butterbach-Bahl K.;Yu L.;Cai A.;Fu J.;Yu H.;Zhang W.;Huang W.;Jian Y.;Jiang W.;Zhao Z.;Luo J.;Deng J.;Zhou F.

作者机构：

关键词： denitrification;N cycle;nitrogen use efficiency;process-based model;rice paddy

期刊名称： Global Change Biology

ISSN： 1354-1013

年卷期： 2024 年 30 卷 2 期

页码：

收录情况： SCIE（2024版）

摘要： Denitrification plays a critical role in soil nitrogen (N) cycling, affecting N availability in agroecosystems. However, the challenges in direct measurement of denitrification products (NO, N2O, and N2) hinder our understanding of denitrification N losses patterns across the spatial scale. To address this gap, we constructed a data-model fusion method to map the county-scale denitrification N losses from China's rice fields over the past decade. The estimated denitrification N losses as a percentage of N application from 2009 to 2018 were 11.8 ± 4.0% for single rice, 12.4 ± 3.7% for early rice, and 11.6 ± 3.1% for late rice. The model results showed that the spatial heterogeneity of denitrification N losses is primarily driven by edaphic and climatic factors rather than by management practices. In particular, diffusion and production rates emerged as key contributors to the variation of denitrification N losses. These findings humanize a 38.9 ± 4.8 kg N ha−1 N loss by denitrification and challenge the common hypothesis that substrate availability drives the pattern of N losses by denitrification in rice fields. © 2024 John Wiley & Sons Ltd.

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