Campus Units

Ecology, Evolution and Organismal Biology

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

6-13-2020

Journal or Book Title

Global Change Biology

DOI

10.1111/gcb.15220

Abstract

The ongoing global change is multi-faceted, but the interactive effects of multiple drivers on persistence of soil carbon (C) are poorly understood. We examined the effects of warming, reactive nitrogen (N) inputs (12 g N m-2 y-1) and altered precipitation (+ or – 30% ambient) on soil aggregates and mineral-associated C in a 4-yr manipulation experiment with a semi-arid grassland on China’s Loess Plateau. Our results showed that in the absence of N inputs, precipitation additions significantly enhanced soil aggregation and promoted the coupling between aggregation and both soil fungal biomass and exchangeable Mg2+. However, N inputs negated the promotional effects of increased precipitation, mainly through suppressing fungal growth and altering soil pH and clay-Mg2+-OC bridging. Warming increased C content in the mineral-associated fraction, likely by increasing inputs of root-derived C, and reducing turnover of existing mineral-associated C due to suppression of fungal growth and soil respiration. Together, our results provide new insights into the potential mechanisms through which multiple global change factors control soil C persistence in arid and semi-arid grasslands. These findings suggest that the interactive effects among global change factors should be incorporated to predict the soil C dynamics under future global change scenarios.

Comments

This is the peer reviewed version of the following article: Bai, Tongshuo, Peng Wang, Steven J. Hall, Fuwei Wang, Chenglong Ye, Zhen Li, Shijie Li et al. "Interactive global change factors mitigate soil aggregation and carbon change in a semi‐arid grassland." Global Change Biology (2020), which has been published in final form at doi: 10.1111/gcb.15220. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

Copyright Owner

John Wiley & Sons Ltd

Language

en

File Format

application/pdf

Available for download on Sunday, June 13, 2021

Published Version

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