Not all soil carbon is created equal: Labile and stable pools under nitrogen input

doi:10.1111/gcb.17405

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	Not all soil carbon is created equal: Labile and stable pools under nitrogen input
	Zang, Huadong; Mehmood, Imran; Kuzyakov, Yakov; Jia, Rong; Gui, Heng; Blagodatskaya, Evgenia; Xu, Xingliang; Smith, Pete; Chen, Haiqing; Zeng, Zhaohai; Fan, Mingsheng
	2024
发表期刊	GLOBAL CHANGE BIOLOGY
ISSN	1354-1013
卷号	30 期号:7 页码:e17405
摘要	Anthropogenic activities have raised nitrogen (N) input worldwide with profound implications for soil carbon (C) cycling in ecosystems. The specific impacts of N input on soil organic matter (SOM) pools differing in microbial availability remain debatable. For the first time, we used a much-improved approach by effectively combining the C-13 natural abundance in SOM with 21 years of C-3-C-4 vegetation conversion and long-term incubation. This allows to distinguish the impact of N input on SOM pools with various turnover times. We found that N input reduced the mineralization of all SOM pools, with labile pools having greater sensitivity to N than stable ones. The suppression in SOM mineralization was notably higher in the very labile pool (18%-52%) than the labile and stable (11%-47%) and the very stable pool (3%-21%) compared to that in the unfertilized control soil. The very labile C pool made a strong contribution (up to 60%) to total CO2 release and also contributed to 74%-96% of suppressed CO2 with N input. This suppression of SOM mineralization by N was initially attributed to the decreased microbial biomass and soil functions. Over the long-term, the shift in bacterial community toward Proteobacteria and reduction in functional genes for labile C degradation were the primary drivers. In conclusion, the higher the availability of the SOM pools, the stronger the suppression of their mineralization by N input. Labile SOM pools are highly sensitive to N availability and may hold a greater potential for C sequestration under N input at global scale.
DOI	10.1111/gcb.17405
WOS记录号	WOS:001263874900001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/76358
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Zang, Huadong,Mehmood, Imran,Kuzyakov, Yakov,et al. Not all soil carbon is created equal: Labile and stable pools under nitrogen input[J]. GLOBAL CHANGE BIOLOGY,2024,30(7):e17405.
APA	Zang, Huadong.,Mehmood, Imran.,Kuzyakov, Yakov.,Jia, Rong.,Gui, Heng.,...&Fan, Mingsheng.(2024).Not all soil carbon is created equal: Labile and stable pools under nitrogen input.GLOBAL CHANGE BIOLOGY,30(7),e17405.
MLA	Zang, Huadong,et al."Not all soil carbon is created equal: Labile and stable pools under nitrogen input".GLOBAL CHANGE BIOLOGY 30.7(2024):e17405.

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