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Priming effect and its regulating factors for fast and slow soil organic carbon pools: A meta-analysis

Pedosphere 2022年第1期32卷 140-148页

作者： changfu HUO Junyi LIANG Weidong ZHANG Peng WANG Weixin cHENG Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Department of Grassland Resources and Ecology College of Grassland Science and TechnologyChina Agricultural UniversityBeijing 100083China Environmental Studies Department University of CaliforniaSanta Cruz CA 95064USA

The priming effect (PE) plays a critical role in the control of soil carbon (c) cycling and influences the alteration of soil organic c (SOc) decomposition by fresh c ***,drivers of PE for the fast and slow SOc pools remain unclear because of the varying results from individual *** meta-analysis in combination with boosted regression tree (BRT) analysis,we evaluated the relative contribution of multiple drivers of PE with substrate and their patterns across each driver *** results showed that the variability of PE was larger for the fast SOc pool than for the slow SOc *** on the BRT analysis,67%and 34%of the variation in PE were explained for the fast and slow SOc pools,*** were seven determinants of PE for the fast SOc pool,with soil total nitrogen (N) content being the most important,followed by,in a descending order,substrate c:N ratio,soil moisture,soil clay content,soil pH,substrate addition rate,and SOc *** directions of PE were negative when soil total N content and substrate c:N ratio were below 2 g kg~(-1)and 20,respectively,but the directions changed from negative to positive with increasing levels of this two *** with optimal water content (50%–70%of the water-holding capacity) or moderately low pH (5–6) were prone to producing a greater *** the slow SOc pool,soil p H and soil total N content substantially explained the variation in *** magnitude of PE was likely to decrease with increasing soil pH for the slow SOc *** addition,the magnitude of PE slightly fluctuated with soil N content for the slow SOc ***,this meta-analysis provided new insights into the distinctive PEs for different SOc pools and indicated knowledge gaps between PE and its regulating factors for the slow SOc pool.

关键词： boosted regression tree fresh c input recalcitrant carbon soil carbon cycling soil carbon mineralization soil moisture soil nitrogen content soil organic carbon

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