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

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Title: The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands.
Authors: Yue, Haowei1, Wang, Mengmeng1, Wang, Shiping2, Gilbert, Jack A3, Sun, Xin1, Wu, Linwei1, Lin, Qiaoyan4, Hu, Yigang5, Li, Xiangzhen6, He, Zhili7, Zhou, Jizhong8, Yang, Yunfeng1
Source: ISME Journal: Multidisciplinary Journal of Microbial Ecology. Sep2015, Vol. 9 Issue 9, p2012-2020. 9p.
Subjects: Microbending, Microorganisms, Topsoil, Carbon in soils, Carbon sequestration, Grasslands
Abstract: 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. [ABSTRACT FROM AUTHOR]
Copyright of ISME Journal: Multidisciplinary Journal of Microbial Ecology is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 108953471
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands.
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  Data: <searchLink fieldCode="AR" term="%22Yue%2C+Haowei%22">Yue, Haowei</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Mengmeng%22">Wang, Mengmeng</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Shiping%22">Wang, Shiping</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Gilbert%2C+Jack+A%22">Gilbert, Jack A</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Sun%2C+Xin%22">Sun, Xin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wu%2C+Linwei%22">Wu, Linwei</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lin%2C+Qiaoyan%22">Lin, Qiaoyan</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Hu%2C+Yigang%22">Hu, Yigang</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Li%2C+Xiangzhen%22">Li, Xiangzhen</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22He%2C+Zhili%22">He, Zhili</searchLink><relatesTo>7</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhou%2C+Jizhong%22">Zhou, Jizhong</searchLink><relatesTo>8</relatesTo><br /><searchLink fieldCode="AR" term="%22Yang%2C+Yunfeng%22">Yang, Yunfeng</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22ISME+Journal%3A+Multidisciplinary+Journal+of+Microbial+Ecology%22">ISME Journal: Multidisciplinary Journal of Microbial Ecology</searchLink>. Sep2015, Vol. 9 Issue 9, p2012-2020. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Microbending%22">Microbending</searchLink><br /><searchLink fieldCode="DE" term="%22Microorganisms%22">Microorganisms</searchLink><br /><searchLink fieldCode="DE" term="%22Topsoil%22">Topsoil</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+in+soils%22">Carbon in soils</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+sequestration%22">Carbon sequestration</searchLink><br /><searchLink fieldCode="DE" term="%22Grasslands%22">Grasslands</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of ISME Journal: Multidisciplinary Journal of Microbial Ecology is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1038/ismej.2015.19
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 2012
    Subjects:
      – SubjectFull: Microbending
        Type: general
      – SubjectFull: Microorganisms
        Type: general
      – SubjectFull: Topsoil
        Type: general
      – SubjectFull: Carbon in soils
        Type: general
      – SubjectFull: Carbon sequestration
        Type: general
      – SubjectFull: Grasslands
        Type: general
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      – TitleFull: The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands.
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              Text: Sep2015
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