干旱区生态环境知识资源中心(Arid): Soil microbial CO2 fixation plays a significant role in terrestrial carbon sink in a dryland ecosystem: A four-year small-scale field-plot observation on the Tibetan Plateau

Arid

DOI	10.1016/j.scitotenv.2020.143282
	Soil microbial CO2 fixation plays a significant role in terrestrial carbon sink in a dryland ecosystem: A four-year small-scale field-plot observation on the Tibetan Plateau
	Chen, Hao; Wang, Fei; Kong, Weidong; Jia, Hongzeng; Zhou, Tianqi; Xu, Ri; Wu, Guangjian; Wang, Junbo; Wu, Jinshui
通讯作者	Kong, WD (corresponding author), Chinese Acad Sci, Inst Tibetan Plateau Res, Bldg 3,Courtyard 16,Lincui Rd, Beijing 100101, Peoples R China.
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2021
卷号	761
英文摘要	Assessment of the global terrestrial carbon (C) sink remains uncertain, and the uncertainty is largely derived from dryland ecosystems. Here we investigated the uncertainty and dynamics of gross primary productivity (GPP) by distinguishing the contributions of soil microbial primary producers and plants to CO2 fixation during four sequential growing seasons in a fragile dry grassland on the Tibetan Plateau. The results demonstrated that soil microbial GPP consistently accounted for a high proportion of plant GPP (18.2%), and both exhibited similar seasonal patterns during the four-year observation. Soil microbial GPP demonstrated a much greater interannual variation (76.1%) than plant GPP (15.1%), indicating that the interannual GPP uncertainty could be largely from microbial primary producers. Regression analysis indicated that plant GPP had higher sensitivity (demonstrated by slope) than soil microbial GPP to both soil water content and temperature. The GPP ratio of soil microbes to plants also demonstrated a clear seasonal change, and peaked in July in the four-year observation, with a minimum interannual variation (6.8%). The GPP ratio enhanced with increasing soil water content (P < 0.001), but did not correlate with soil temperature. Our findings suggest the great potential of soil microbial GPP, and challenge the plant-oriented models of terrestrial C estimation, which account for plant GPP but ignore soil microbial GPP. Thus, a more robust framework needs to incorporate both soil microbial and plant GPPs for accurately assessing C balance. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Dry grassland Gross primary productivity Microbial primary producers CO2 fixation Soil carbon Tibetan Plateau
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000607780900085
WOS关键词	SEMIARID ECOSYSTEMS ; ATMOSPHERIC CO2 ; CLIMATE-CHANGE ; DESERT ; TEMPERATURE ; MICROORGANISMS ; ASSIMILATION ; VARIABILITY ; GRASSLAND ; RESPONSES
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	中国科学院青藏高原研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348169
作者单位	[Chen, Hao; Wang, Fei; Kong, Weidong; Jia, Hongzeng; Zhou, Tianqi; Xu, Ri] Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol, Beijing 100101, Peoples R China; [Kong, Weidong; Xu, Ri; Wu, Guangjian; Wang, Junbo] Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China; [Wang, Fei; Kong, Weidong; Jia, Hongzeng; Zhou, Tianqi] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China; [Wu, Guangjian; Wang, Junbo] Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China; [Wu, Jinshui] Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Peoples R China
推荐引用方式 GB/T 7714	Chen, Hao,Wang, Fei,Kong, Weidong,et al. Soil microbial CO2 fixation plays a significant role in terrestrial carbon sink in a dryland ecosystem: A four-year small-scale field-plot observation on the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2021,761.
APA	Chen, Hao.,Wang, Fei.,Kong, Weidong.,Jia, Hongzeng.,Zhou, Tianqi.,...&Wu, Jinshui.(2021).Soil microbial CO2 fixation plays a significant role in terrestrial carbon sink in a dryland ecosystem: A four-year small-scale field-plot observation on the Tibetan Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,761.
MLA	Chen, Hao,et al."Soil microbial CO2 fixation plays a significant role in terrestrial carbon sink in a dryland ecosystem: A four-year small-scale field-plot observation on the Tibetan Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 761(2021).