The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands

NWIPB OpenIR

	The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands
	Yue, Haowei 1; Wang, Mengmeng 1; Wang, Shiping 2,3; Gilbert, Jack A.4,5,6; Sun, Xin 1; Wu, Linwei 1; Lin, Qiaoyan 7; Hu, Yigang 7,8; Li, Xiangzhen 9,10; He, Zhili 11,12; Zhou, Jizhong 1,11,12,13,14; Yang, Yunfeng 1
	2015-09-01
发表期刊	ISME JOURNAL
卷号	9 期号:9 页码:2012-2020
文章类型	Article
摘要	Warming has been shown to cause soil carbon (C) loss in northern grasslands owing to accelerated microbial decomposition that offsets increased grass productivity. Yet, a multi-decadal survey indicated that the surface soil C stock in Tibetan alpine grasslands remained relatively stable. To investigate this inconsistency, we analyzed the feedback responses of soil microbial communities to simulated warming by soil transplant in Tibetan grasslands. Whereas microbial functional diversity decreased in response to warming, microbial community structure did not correlate with changes in temperature. The relative abundance of catabolic genes associated with nitrogen (N) and C cycling decreased with warming, most notably in genes encoding enzymes associated with more recalcitrant C substrates. By contrast, genes associated with C fixation increased in relative abundance. The relative abundance of genes associated with urease, glutamate dehydrogenase and ammonia monoxygenase (ureC, gdh and amoA) were significantly correlated with N2O efflux. These results suggest that unlike arid/semiarid grasslands, Tibetan grasslands maintain negative feedback mechanisms that preserve terrestrial C and N pools. To examine whether these trends were applicable to the whole plateau, we included these measurements in a model and verified that topsoil C stocks remained relatively stable. Thus, by establishing linkages between microbial metabolic potential and soil biogeochemical processes, we conclude that long-term C loss in Tibetan grasslands is ameliorated by a reduction in microbial decomposition of recalcitrant C substrates.; Warming has been shown to cause soil carbon (C) loss in northern grasslands owing to accelerated microbial decomposition that offsets increased grass productivity. Yet, a multi-decadal survey indicated that the surface soil C stock in Tibetan alpine grasslands remained relatively stable. To investigate this inconsistency, we analyzed the feedback responses of soil microbial communities to simulated warming by soil transplant in Tibetan grasslands. Whereas microbial functional diversity decreased in response to warming, microbial community structure did not correlate with changes in temperature. The relative abundance of catabolic genes associated with nitrogen (N) and C cycling decreased with warming, most notably in genes encoding enzymes associated with more recalcitrant C substrates. By contrast, genes associated with C fixation increased in relative abundance. The relative abundance of genes associated with urease, glutamate dehydrogenase and ammonia monoxygenase (ureC, gdh and amoA) were significantly correlated with N2O efflux. These results suggest that unlike arid/semiarid grasslands, Tibetan grasslands maintain negative feedback mechanisms that preserve terrestrial C and N pools. To examine whether these trends were applicable to the whole plateau, we included these measurements in a model and verified that topsoil C stocks remained relatively stable. Thus, by establishing linkages between microbial metabolic potential and soil biogeochemical processes, we conclude that long-term C loss in Tibetan grasslands is ameliorated by a reduction in microbial decomposition of recalcitrant C substrates.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]	CLIMATE-CHANGE ; COMMUNITY STRUCTURE ; BIOGEOCHEMICAL CYCLES ; ALPINE MEADOW ; SOIL ; NITROGEN ; PLATEAU ; RESPONSES ; GRADIENT ; TUNDRA
收录类别	SCI
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Microbiology
WOS类目	Ecology ; Microbiology
WOS记录号	WOS:000360019500010
引用统计	被引频次：71[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/5519
专题	中国科学院西北高原生物研究所
作者单位	1.Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China 2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing, Peoples R China 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 4.Argonne Natl Lab, Inst Genom & Syst Biol, Argonne, IL 60439 USA 5.Univ Chicago, Dept Ecol & Evolut, Chicago, IL 60637 USA 6.Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou 310003, Zhejiang, Peoples R China 7.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adapt & Evolut Plateau Biota, Xining, Peoples R China 8.Chinese Acad Sci, Cold & Arid Reg & Environm & Engn Res Inst, Shapotou Desert Expt & Res Stn, Lanzhou, Peoples R China 9.Chinese Acad Sci, Chengdu Inst Biol, Key Lab Environm & Appl Microbiol, Beijing 100864, Sichuan, Peoples R China 10.Chinese Acad Sci, Chengdu Inst Biol, Environm Microbiol Key Lab Sichuan Prov, Beijing 100864, Sichuan, Peoples R China 11.Univ Oklahoma, Inst Environm Genom, Norman, OK 73019 USA 12.Univ Oklahoma, Dept Microbiol & Plant Biol, Norman, OK 73019 USA 13.Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Earth Sci, Berkeley, CA 94720 USA 14.Tsinghua Univ, Sch Environm, Collaborat Innovat Ctr Reg Environm Qual, Beijing 100084, Peoples R China
推荐引用方式 GB/T 7714	Yue, Haowei,Wang, Mengmeng,Wang, Shiping,et al. The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands[J]. ISME JOURNAL,2015,9(9):2012-2020.
APA	Yue, Haowei.,Wang, Mengmeng.,Wang, Shiping.,Gilbert, Jack A..,Sun, Xin.,...&Yang, Yunfeng.(2015).The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands.ISME JOURNAL,9(9),2012-2020.
MLA	Yue, Haowei,et al."The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands".ISME JOURNAL 9.9(2015):2012-2020.

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