Depth-dependent drivers of soil microbial necromass carbon across Tibetan alpine grasslands

© 2021 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 28(2022), 3 vom: 04. Feb., Seite 936-949
1. Verfasser: He, Mei (VerfasserIn)
Weitere Verfasser: Fang, Kai, Chen, Leiyi, Feng, Xuehui, Qin, Shuqi, Kou, Dan, He, Hongbo, Liang, Chao, Yang, Yuanhe
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2022
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article carbon cycle carbon-climate feedback deep soil microbial residue mineral protection plant carbon input Soil Carbon 7440-44-0
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520 |a Microbial necromass carbon (C) has been considered an important contributor to persistent soil C pool. However, there still lacks large-scale systematic observations on microbial necromass C in different soil layers, particularly for alpine ecosystems. Besides, it is still unclear whether the relative importance of biotic and abiotic variables such as plant C input and mineral properties in regulating microbial necromass C would change with soil depth. Based on the combination of large-scale sampling along a ~2200 km transect across Tibetan alpine grasslands and biomarker analysis, together with a global data synthesis across grassland ecosystems, we observed a relatively low proportion of microbial-derived C in Tibetan alpine grasslands compared to global grasslands (topsoil: 45.4% vs. 58.1%; subsoil: 41.7% vs. 53.7%). We also found that major determinants of microbial necromass C depended on soil depth. In topsoil, both plant C input and mineral protection exerted dominant effects on microbial necromass C. However, in subsoil, the physico-chemical protection provided by soil clay particles, iron-aluminum oxides, and exchangeable calcium dominantly facilitated the preservation of microbial necromass C. The differential drivers over microbial necromass C between soil depths should be considered in Earth system models for accurately forecasting soil C dynamics and its potential feedback to global warming 
650 4 |a Journal Article 
650 4 |a carbon cycle 
650 4 |a carbon-climate feedback 
650 4 |a deep soil 
650 4 |a microbial residue 
650 4 |a mineral protection 
650 4 |a plant carbon input 
650 7 |a Soil  |2 NLM 
650 7 |a Carbon  |2 NLM 
650 7 |a 7440-44-0  |2 NLM 
700 1 |a Fang, Kai  |e verfasserin  |4 aut 
700 1 |a Chen, Leiyi  |e verfasserin  |4 aut 
700 1 |a Feng, Xuehui  |e verfasserin  |4 aut 
700 1 |a Qin, Shuqi  |e verfasserin  |4 aut 
700 1 |a Kou, Dan  |e verfasserin  |4 aut 
700 1 |a He, Hongbo  |e verfasserin  |4 aut 
700 1 |a Liang, Chao  |e verfasserin  |4 aut 
700 1 |a Yang, Yuanhe  |e verfasserin  |4 aut 
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773 1 8 |g volume:28  |g year:2022  |g number:3  |g day:04  |g month:02  |g pages:936-949 
856 4 0 |u http://dx.doi.org/10.1111/gcb.15969  |3 Volltext 
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