Knowledge Management System of Northwest Institute of Plateau Biology, CAS
The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands | |
Yue, Haowei1; Wang, Mengmeng1; Wang, Shiping2,3; Gilbert, Jack A.4,5,6; Sun, Xin1; Wu, Linwei1; Lin, Qiaoyan7; Hu, Yigang7,8; Li, Xiangzhen9,10; He, Zhili11,12; Zhou, Jizhong1,11,12,13,14; Yang, Yunfeng1 | |
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 | |
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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