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Modeling denitrification nitrogen losses in China's rice fields based on multiscale field‐experiment constraints.
- Source :
-
Global Change Biology . Feb2024, Vol. 30 Issue 2, p1-16. 16p. - Publication Year :
- 2024
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PADDY fields
*DENITRIFICATION
*NITROGEN in soils
*NITROGEN
*NITROUS oxide
Subjects
Details
- Language :
- English
- ISSN :
- 13541013
- Volume :
- 30
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Global Change Biology
- Publication Type :
- Academic Journal
- Accession number :
- 175704008
- Full Text :
- https://doi.org/10.1111/gcb.17199