NWIPB OpenIR
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
发表期刊ISME JOURNAL
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.
文献类型期刊论文
条目标识符http://210.75.249.4/handle/363003/22397
专题中国科学院西北高原生物研究所
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.
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.
MLA Yue, Haowei,et al."The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands".ISME JOURNAL (2015).
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Yue, Haowei]的文章
[Wang, Mengmeng]的文章
[Wang, Shiping]的文章
百度学术
百度学术中相似的文章
[Yue, Haowei]的文章
[Wang, Mengmeng]的文章
[Wang, Shiping]的文章
必应学术
必应学术中相似的文章
[Yue, Haowei]的文章
[Wang, Mengmeng]的文章
[Wang, Shiping]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。