气候变化领域集成服务门户(CCPortal): Warming and increased precipitation indirectly affect the composition and turnover of labile-fraction soil organic matter by directly affecting vegetation and microorganisms

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DOI	10.1016/j.scitotenv.2020.136787
	Warming and increased precipitation indirectly affect the composition and turnover of labile-fraction soil organic matter by directly affecting vegetation and microorganisms
	Chen, Qiuyu; Niu, Bin; Hu, Yilun; Luo, Tianxiang; Zhang, Gengxin
通讯作者	Zhang, GX (通讯作者)
发表日期	2020
ISSN	0048-9697
EISSN	1879-1026
卷号	714
英文摘要	Global warming accompanied by precipitation changes impacts soil carbon sequestration. A three-year field manipulation experiment with warming ( +2 degrees C above ambient temperature) and increased precipitation (+15% and +30% above ambient precipitation) was conducted in an alpine grassland to investigate the response of soil organic matter (SOM) to future climate change on the Qinghai-Tibet Plateau (QTP). Labile-fraction SOM (LF-SOM) fingerprints were characterized by pyrolysis-gas chromatography/tandem-mass spectrometry (PyGC-MS/MS), and organic compounds in LF-SOM were used as indicators to quantify the contributions of vegetation input and microbial degradation to LF-SOM transformation. Increased precipitation promoted LE-SOM accumulation, which were mainly due to the positive effect of increased precipitation on vegetation productivity. Plant-derived compounds in LF-SOM (including lignin, long-chain alkyl compounds, polysaccharides and phenols) were more sensitive to increasing soil moisture than microbial-derived (including short-chain alkyl compounds, N compounds and chitin) and aromatic-derived compounds (including aromatics and polyaromatics). In contrast, warming alone intensified the effect of drought on the alpine grassland, which had negative effects on both vegetation and microorganisms and reduced LF-SOM. Warming plus increased precipitation not only alleviated the water loss caused by warming but also increased soil temperature, which was more favorable for the growth of microorganisms. This was reflected in the increase in microbial-derived compounds in LF-SOM with increasing soil temperature, which contributed to LF-SOM degradation. Aromatic-derived compounds, as refractory compounds in soil, showed no significant response to either warming or increased precipitation treatments. Acidobacteria (approximately 25%) and Actinobacteria (approximately 20%), as the dominant soil bacterial communities in the alpine grassland, were significantly correlated with plant-derived compounds. At the same time, there were significant correlations between Proteobacteria and microbial-derived compounds, as well as between Firmicutes and aromatic-derived compounds (relative abundance). Under future climate change, microbial activity will increase as temperature increases, which will promote Li-SOM degradation only if precipitation also increases. (C) 2020 Elsevier B.V. All rights reserved.
关键词	LARGE ALTITUDINAL GRADIENT LITTER DECOMPOSITION TEMPERATURE SENSITIVITY ECOSYSTEM RESPIRATION ALPINE GRASSLANDS PLANT COMMUNITY CLIMATE-CHANGE FOREST SOILS CARBON RESPONSES
英文关键词	Climate change; Labile-fraction soil organic matter; Organic compounds; Alpine grassland; Qinghai-Tibet Plateau
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000517760200149
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
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/259725
推荐引用方式 GB/T 7714	Chen, Qiuyu,Niu, Bin,Hu, Yilun,et al. Warming and increased precipitation indirectly affect the composition and turnover of labile-fraction soil organic matter by directly affecting vegetation and microorganisms[J]. 中国科学院青藏高原研究所,2020,714.
APA	Chen, Qiuyu,Niu, Bin,Hu, Yilun,Luo, Tianxiang,&Zhang, Gengxin.(2020).Warming and increased precipitation indirectly affect the composition and turnover of labile-fraction soil organic matter by directly affecting vegetation and microorganisms.SCIENCE OF THE TOTAL ENVIRONMENT,714.
MLA	Chen, Qiuyu,et al."Warming and increased precipitation indirectly affect the composition and turnover of labile-fraction soil organic matter by directly affecting vegetation and microorganisms".SCIENCE OF THE TOTAL ENVIRONMENT 714(2020).