Journal article

Optimizing nitrogen fertilization rate to enhance soil carbon storage and decrease nitrogen pollution in paddy ecosystems with simultaneous straw incorporation

Longlong Xia, Shu Kee Lam, Shuwei Wang, Wei Zhou, Deli Chen, Xiaoyuan Yan

AGRICULTURE ECOSYSTEMS & ENVIRONMENT | ELSEVIER | Published : 2020

Abstract

Nitrogen fertilization (NF) is an important agricultural management practice that greatly affects soil carbon (C) storage through regulating the balance of soil C input (straw biomass) and output (ecosystem respiration), especially for agroecosystems with simultaneous straw incorporation (SI). However, little is known about how different NF rates affect soil C balance (net ecosystem carbon budget, NECB) in flooded paddy ecosystems with SI. We conducted a two-year field experiment in a typical rice–wheat cropping system in southern China to investigate the response of soil C input (net primary production (NPP) and SI), output (ecosystem respiration and methane emissions), and NECB and N losse..

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Grants

Awarded by National Key R&D Program of China


Awarded by National Science Foundation of China


Funding Acknowledgements

The study was financially supported by the National Key R&D Program of China (2017YFD0200100), the National Science Foundation of China (41425005 and 41471238) and the Humboldt Postdoctoral Research Fellowship. We gratefully acknowledge the technical assistance provided by the Changshu Agroecological Experimental Station of the Chinese Academy of Sciences.