干旱区生态环境知识资源中心(Arid): Comparison of Soil Organic Matter Transformation Processes in Different Alpine Ecosystems in the Qinghai-Tibet Plateau

Arid

DOI	10.1029/2018JG004599
	Comparison of Soil Organic Matter Transformation Processes in Different Alpine Ecosystems in the Qinghai-Tibet Plateau
	Chen, Qiuyu 1,2; Lei, Tianzhu 3; Wu, Yingqin 3; Si, Guicai 3; Xi, Chuanwu 4; Zhang, Gengxin 1
通讯作者	Zhang, Gengxin
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN	2169-8953
EISSN	2169-8961
出版年	2019
卷号	124 期号:1 页码:33-45
英文摘要	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.
英文关键词	alpine ecosystem organic matter transformation microbial community soil density fractionation Py-GC-MS MS
类型	Article
语种	英语
国家	Peoples R China ; USA
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000458728400003
WOS关键词	MICROBIAL COMMUNITY COMPOSITION ; DIFFERENT VEGETATION TYPES ; PYROLYSIS-GC/MS ; ENZYME-ACTIVITIES ; CLIMATE-CHANGE ; CARBON POOLS ; FOREST ; BIOMASS ; TEMPERATURE ; PERMAFROST
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
来源机构	中国科学院青藏高原研究所 ; 中国科学院地质与地球物理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217080
作者单位	1.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
推荐引用方式 GB/T 7714	Chen, Qiuyu,Lei, Tianzhu,Wu, Yingqin,et al. Comparison of Soil Organic Matter Transformation Processes in Different Alpine Ecosystems in the Qinghai-Tibet Plateau[J]. 中国科学院青藏高原研究所, 中国科学院地质与地球物理研究所,2019,124(1):33-45.
APA	Chen, Qiuyu,Lei, Tianzhu,Wu, Yingqin,Si, Guicai,Xi, Chuanwu,&Zhang, Gengxin.(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, Qiuyu,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.