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Comparison of Soil Organic Matter Transformation Processes in Different Alpine Ecosystems in the Qinghai-Tibet Plateau
Chen, QY (Chen, Qiuyu)1,2; Lei, TZ (Lei, Tianzhu)3; Wu, YQ (Wu, Yingqin)3; Si, GC (Si, Guicai)3; Xi, CW (Xi, Chuanwu)4; Zhang, GX (Zhang, Gengxin)1
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
2019
Volume124Issue:1Pages:33-45
DOI10.1029/2018JG004599
Abstract

Soils in the Qinghai-Tibet Plateau are young in terms of development and form a thin, skeletal soil layer because the gravel parent materials are glaciofluvial deposit, eluvium, and fluvial sediment, which are extremely sensitive to global climate change. The lack of understanding of soil organic matter (SOM) transformation processes in this region hinders the prediction of SOM stocks under future climate conditions. In this study, SOM transformation processes were investigated by density groupings and pyrolysis-gas chromatography/tandem-mass spectrometry (Py-GC-MS/MS) in five alpine ecosystems: alpine desert, alpine grassland, alpine meadow, alpine wetland, and alpine forest. The roles of microbial community in different density fractions were elucidated. Soil samples were separated into three fractions with NaI solution: labile fraction (F-L; rho <= 1.6 g/cm(3)), moderate fraction (F-M; 1.6 < rho < 2.25 g/cm(3)), and recalcitrant fraction (F-R; rho >= 2.25 g/cm(3)). The following results were obtained. (1) The ratios of different fractions (F-M/F-L, F-R/F-M, and F-R/F-L) indicated the transformation processes of SOM, and ratios less than 1 represented degradation. The transformation processes were similar in alpine grassland and meadow and were similar in alpine desert, wetland, and forest but differed from each other. (2) Fungi preferred to degrade plant detritus, which mainly affected F-L, whereas bacteria chiefly affected F-M. (3) Precipitation altered vegetation type and soil pH, thus affecting communities and microorganism activities and resulting in the above differences. These findings highlight the importance of understanding the limited transformation processes of SOM in ecosystems to predict the impact of climate change on SOM preservation.

Subject AreaEnvironmental Sciences
WOS IDWOS:000458728400003
Language英语
Indexed BySCI
KeywordMicrobial Community Composition Different Vegetation Types Pyrolysis-gc/ms Enzyme-activities Climate-change Carbon Pools Forest Biomass Temperature Permafrost
WOS Research AreaEnvironmental Sciences & Ecology ; Geology
WOS SubjectEnvironmental Sciences ; Geosciences, Multidisciplinary
Cooperation Status国内
ISSN2169-8953
Department高寒生态与人类适应
URL查看原文
PublisherAMER GEOPHYSICAL UNION
SubtypeArticle
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Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9450
Collection图书馆
Corresponding AuthorZhang, GX (Zhang, Gengxin)
Affiliation1.Chinese Acad Sci, Key Lab Alpine Ecol & Biodivers, Inst Tibetan Plateau Res, Beijing, Peoples R China;
2.Univ Chinese Acad Sci, Beijing, Peoples R China;
3.Chinese Acad Sci, Key Lab Petr Resources Res, Inst Geol & Geophys, Lanzhou, Gansu, Peoples R China;
4.Univ Michigan, Sch Publ Hlth, Dept Environm Hlth Sci, Ann Arbor, MI 48109 USA.
Recommended Citation
GB/T 7714
Chen, QY ,Lei, TZ ,Wu, YQ ,et al. Comparison of Soil Organic Matter Transformation Processes in Different Alpine Ecosystems in the Qinghai-Tibet Plateau[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2019,124(1):33-45.
APA Chen, QY ,Lei, TZ ,Wu, YQ ,Si, GC ,Xi, CW ,&Zhang, GX .(2019).Comparison of Soil Organic Matter Transformation Processes in Different Alpine Ecosystems in the Qinghai-Tibet Plateau.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,124(1),33-45.
MLA Chen, QY ,et al."Comparison of Soil Organic Matter Transformation Processes in Different Alpine Ecosystems in the Qinghai-Tibet Plateau".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 124.1(2019):33-45.
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