globalchange  > 气候变化与战略
DOI: 10.1016/j.scitotenv.2020.136787
Title:
Warming and increased precipitation indirectly affect the composition and turnover of labile-fraction soil organic matter by directly affecting vegetation and microorganisms
Author: Chen Q.; Niu B.; Hu Y.; Luo T.; Zhang G.
Source Publication: Science of the Total Environment
ISSN: 489697
Publishing Year: 2020
Volume: 714
Language: 英语
Keyword: Alpine grassland ; Climate change ; Labile-fraction soil organic matter ; Organic compounds ; Qinghai-Tibet Plateau
Scopus Keyword: Aromatic compounds ; Aromatization ; Biodegradation ; Biogeochemistry ; Climate change ; Forestry ; Gas chromatography ; Global warming ; Microorganisms ; Organic compounds ; Soil moisture ; Temperature ; Alpine grasslands ; Microbial degradation ; Pyrolysis gas chromatography ; Qinghai Tibet plateau ; Soil bacterial community ; Soil carbon sequestration ; Soil organic matters ; Vegetation productivity ; Vegetation ; chitin ; lignin ; organic compound ; phenol ; polysaccharide ; soil organic matter ; alpine environment ; climate change ; climate effect ; precipitation (climatology) ; soil biota ; soil organic matter ; vegetation structure ; warming ; Acidobacteria ; Actinobacteria ; Article ; bacterial growth ; chemical composition ; climate change ; controlled study ; drought ; environmental impact ; environmental temperature ; Firmicutes ; grassland ; greenhouse effect ; microbial activity ; microbial community ; microbial degradation ; nonhuman ; population abundance ; precipitation ; principal component analysis ; priority journal ; Proteobacteria ; pyrolysis mass spectrometry ; soil degradation ; soil microflora ; soil moisture ; soil temperature ; vegetation ; water loss ; water stress ; Aromatic Compounds ; Biodegradation ; Forestry ; Gas Chromatography ; Microorganisms ; Organic Compounds ; China ; Qinghai-Xizang Plateau ; Acidobacteria ; Actinobacteria ; Bacteria (microorganisms) ; Firmicutes ; Proteobacteria
English Abstract: Global warming accompanied by precipitation changes impacts soil carbon sequestration. A three-year field manipulation experiment with warming (+2 °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 (Py-GC–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 LF-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 LF-SOM degradation only if precipitation also increases. © 2018 Elsevier B.V.
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Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/158355
Appears in Collections:气候变化与战略

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Affiliation: Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research, China Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 10049, China; Key Laboratory of Alpine Ecology (LAE), CAS Center for Excellence in Tibetan Plateau Earth Sciences and Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China

Recommended Citation:
Chen Q.,Niu B.,Hu Y.,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]. Science of the Total Environment,2020-01-01,714
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