气候变化领域集成服务门户(CCPortal): The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands

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DOI	10.1038/ismej.2015.19
	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
通讯作者	Yang, YF (通讯作者)
发表日期	2015
ISSN	1751-7362
EISSN	1751-7370
起始页码	2012
结束页码	2020
卷号	9 期号:9
英文摘要	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.
关键词	CLIMATE-CHANGE COMMUNITY STRUCTURE BIOGEOCHEMICAL CYCLES ALPINE MEADOW SOIL NITROGEN PLATEAU RESPONSES GRADIENT TUNDRA
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Microbiology
WOS类目	Ecology ; Microbiology
WOS记录号	WOS:000360019500010
来源期刊	ISME JOURNAL
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258609
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]. 中国科学院青藏高原研究所,2015,9(9).
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).
MLA	Yue, Haowei,et al."The microbe-mediated mechanisms affecting topsoil carbon stock in Tibetan grasslands".ISME JOURNAL 9.9(2015).