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Disentangling the effect of nitrogen supply on the priming of soil organic matter: A critical review

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posted on 2024-02-29, 03:33 authored by Yunyun ZhengYunyun Zheng, Jian JinJian Jin, Xiaojuan Wang, Peter M Kopittke, James B O’Sullivan, Caixian TangCaixian Tang
The addition of fresh substrates can alter the decomposition of the native soil organic matter, referred to as the priming effect (PE). It is a crucial process within the cycling of soil organic carbon (C) and believed to be regulated by nitrogen (N) input. However, the direction and magnitude of this N effect on the PE are complex due to the involvement of various factors following N addition into the soil. This review synthesizes the key factors driving the responses of the PE to N addition from the perspective of C-substrate quantity and quality, N addition rates and forms, soil properties including organic C stability, N availability, electrical conductivity, pH and pH buffer capacity. The temporal change in the N effect on the PE is also discussed. In studies observing a suppressive effect of N addition on the PE, the role of N addition in directly suppressing microbial community metabolism (e.g., osmotic stress and low pH) has been largely ignored. We propose the application of multi-omics techniques to examine the relationship between microbial functional traits and soil C cycling through the PE and its response to N addition, as well as the application of spatial omics and imaging techniques in exploring the connection between in-situ soil C distribution and the PE and its response to N addition. Such studies can potentially elucidate how elevated atmospheric CO2 may affect the PE and thus soil C stock via increasing plant C input and regulating nutrients sources for plant uptake under N inputs.

Funding

YZ received the La Trobe University scholarships; the work was supported by Australian Research Council (DP210100775) and CT was also supported by Australian Research Council ITRH program (IH200100023).

History

Publication Date

2024-04-01

Journal

Critical Reviews in Environmental Science and Technology

Volume

54

Issue

8

Pagination

22p. (p. 676-697)

Publisher

Taylor & Francis

ISSN

1064-3389

Rights Statement

© 2023 The Author(s). Published with license by Taylor & Francis Group, LLC. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.

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