气候变化领域集成服务门户(CCPortal): 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

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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 (通讯作者)
发表日期	2021
ISSN	0048-9697
EISSN	1879-1026
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.
关键词	SEMIARID ECOSYSTEMS ATMOSPHERIC CO2 CLIMATE-CHANGE DESERT TEMPERATURE MICROORGANISMS ASSIMILATION VARIABILITY GRASSLAND RESPONSES
英文关键词	Dry grassland; Gross primary productivity; Microbial primary producers; CO2 fixation; Soil carbon; Tibetan Plateau
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000607780900085
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
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/260154
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).