The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands
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 investig...
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ftchinacascnwipb:oai:210.75.249.4:363003/5519 2023-05-15T18:40:40+02:00 The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands Yue, Haowei Wang, Mengmeng Wang, Shiping Gilbert, Jack A. Sun, Xin Wu, Linwei Lin, Qiaoyan Hu, Yigang Li, Xiangzhen He, Zhili Zhou, Jizhong Yang, Yunfeng 2015-09-01 http://210.75.249.4/handle/363003/5519 英语 eng ISME JOURNAL http://210.75.249.4/handle/363003/5519 null Science & Technology Life Sciences & Biomedicine CLIMATE-CHANGE COMMUNITY STRUCTURE BIOGEOCHEMICAL CYCLES ALPINE MEADOW SOIL NITROGEN PLATEAU RESPONSES GRADIENT TUNDRA Environmental Sciences & Ecology Microbiology Ecology Article 期刊论文 2015 ftchinacascnwipb 2023-03-26T20:23:08Z 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 ... Article in Journal/Newspaper Tundra Northwest Institute of Plateau Biology: NWIPB OpenIR (Chinese Academy of Sciences) |
institution |
Open Polar |
collection |
Northwest Institute of Plateau Biology: NWIPB OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacascnwipb |
language |
English |
topic |
Science & Technology Life Sciences & Biomedicine CLIMATE-CHANGE COMMUNITY STRUCTURE BIOGEOCHEMICAL CYCLES ALPINE MEADOW SOIL NITROGEN PLATEAU RESPONSES GRADIENT TUNDRA Environmental Sciences & Ecology Microbiology Ecology |
spellingShingle |
Science & Technology Life Sciences & Biomedicine CLIMATE-CHANGE COMMUNITY STRUCTURE BIOGEOCHEMICAL CYCLES ALPINE MEADOW SOIL NITROGEN PLATEAU RESPONSES GRADIENT TUNDRA Environmental Sciences & Ecology Microbiology Ecology Yue, Haowei Wang, Mengmeng Wang, Shiping Gilbert, Jack A. Sun, Xin Wu, Linwei Lin, Qiaoyan Hu, Yigang Li, Xiangzhen He, Zhili Zhou, Jizhong Yang, Yunfeng The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands |
topic_facet |
Science & Technology Life Sciences & Biomedicine CLIMATE-CHANGE COMMUNITY STRUCTURE BIOGEOCHEMICAL CYCLES ALPINE MEADOW SOIL NITROGEN PLATEAU RESPONSES GRADIENT TUNDRA Environmental Sciences & Ecology Microbiology Ecology |
description |
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 ... |
format |
Article in Journal/Newspaper |
author |
Yue, Haowei Wang, Mengmeng Wang, Shiping Gilbert, Jack A. Sun, Xin Wu, Linwei Lin, Qiaoyan Hu, Yigang Li, Xiangzhen He, Zhili Zhou, Jizhong Yang, Yunfeng |
author_facet |
Yue, Haowei Wang, Mengmeng Wang, Shiping Gilbert, Jack A. Sun, Xin Wu, Linwei Lin, Qiaoyan Hu, Yigang Li, Xiangzhen He, Zhili Zhou, Jizhong Yang, Yunfeng |
author_sort |
Yue, Haowei |
title |
The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands |
title_short |
The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands |
title_full |
The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands |
title_fullStr |
The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands |
title_full_unstemmed |
The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands |
title_sort |
microbe-mediated mechanisms affecting topsoil carbon stock in tibetan grasslands |
publishDate |
2015 |
url |
http://210.75.249.4/handle/363003/5519 |
genre |
Tundra |
genre_facet |
Tundra |
op_relation |
ISME JOURNAL http://210.75.249.4/handle/363003/5519 |
op_rights |
null |
_version_ |
1766230069089402880 |