气候变化领域集成服务门户(CCPortal): Shifts in the dynamic mechanisms of soil organic matter transformation with nitrogen addition: From a soil carbon/nitrogen-driven mechanism to a microbe-driven mechanism

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DOI	10.1016/j.soilbio.2021.108355
	Shifts in the dynamic mechanisms of soil organic matter transformation with nitrogen addition: From a soil carbon/nitrogen-driven mechanism to a microbe-driven mechanism
	Chen, Qiuyu; Hu, Yilun; Hu, Ang; Niu, Bin; Yang, Xiaoqin; Jiao, Hongzhe; Xu-Ri; Song, Lili; Zhang, Gengxin
通讯作者	Zhang, GX (通讯作者)
发表日期	2021
ISSN	0038-0717
EISSN	1879-3428
卷号	160
英文摘要	Impacts of atmospheric nitrogen (N) deposition on soil carbon (C) dynamics are highly variable, and the underlying mechanisms remain unclear. This limits our ability to predict soil responses to climate change. Labilefraction soil organic matter (LF-SOM), which is the earliest-responding indicator of soil changes, was examined to investigate SOM dynamics on a Tibetan alpine steppe in response to N addition at six levels (0, 10, 20, 40, 80 and 160 kg.N.ha(-1).yr(-1)) after 2 and 5 years. LF-SOM fingerprints (pyrolysis-gas chromatography/tandem-mass spectrometry) combined with microbial community data (high-throughput sequencing) were used to explore LFSOM responses to N addition and their drivers. LF-SOM showed accumulation (N10-N20) and decomposition (N40-N160) in the 2nd year of N addition but only decomposition (N10-N160) in the 5th year. Organic compounds in LF-SOM showed high sensitivity (90% significant correlations with the N level) but low resistance (0.38 resistance index) and low sensitivity (no significant correlation) but high resistance (0.48) to the N level in the 2nd year and 5th year, respectively. Abiotic and biotic factors showed higher sensitivity to the N level in the 2nd year (more than 70% significant correlations) than in the 5th year (approximately 20% significant correlations), and biotic factors showed higher resistance (0.83) to the N level in the 5th year than in the 2nd year (0.73). Abiotic factors, mainly the soil C/N balance, were the primary drivers of LF-SOM transformation in the 2nd year, while biotic factors, primarily microbes, were the main drivers of LF-SOM decomposition in the 5th year. Our study demonstrated that the variable impacts of N deposition on LF-SOM transformation depended on shifts in the responses of abiotic and biotic factors to N accumulation. This understanding is significant for predicting terrestrial ecosystem functions under future N deposition.
关键词	CARBON PLANT LITTER STOICHIOMETRY DECOMPOSITION BIODIVERSITY SPECTROMETRY COMMUNITIES GRASSLANDS LIMITATION
英文关键词	N deposition; Soil organic matter transformation; Abiotic factor; Biotic factor; Sensitivity; Resistance
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:000692631600004
来源期刊	SOIL BIOLOGY & BIOCHEMISTRY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260310
推荐引用方式 GB/T 7714	Chen, Qiuyu,Hu, Yilun,Hu, Ang,et al. Shifts in the dynamic mechanisms of soil organic matter transformation with nitrogen addition: From a soil carbon/nitrogen-driven mechanism to a microbe-driven mechanism[J]. 中国科学院青藏高原研究所,2021,160.
APA	Chen, Qiuyu.,Hu, Yilun.,Hu, Ang.,Niu, Bin.,Yang, Xiaoqin.,...&Zhang, Gengxin.(2021).Shifts in the dynamic mechanisms of soil organic matter transformation with nitrogen addition: From a soil carbon/nitrogen-driven mechanism to a microbe-driven mechanism.SOIL BIOLOGY & BIOCHEMISTRY,160.
MLA	Chen, Qiuyu,et al."Shifts in the dynamic mechanisms of soil organic matter transformation with nitrogen addition: From a soil carbon/nitrogen-driven mechanism to a microbe-driven mechanism".SOIL BIOLOGY & BIOCHEMISTRY 160(2021).