气候变化领域集成服务门户(CCPortal): Convergent control of soil temperature on seasonal carbon flux in Tibetan alpine meadows: An in-situ monitoring study

CCPortal

DOI	10.1016/j.ecolind.2023.111116
	Convergent control of soil temperature on seasonal carbon flux in Tibetan alpine meadows: An in-situ monitoring study
	Xing, Yuhua; Wang, Pei; Zhang, Dapeng; Sun, Haitao; Li, Siying
发表日期	2023
ISSN	1470-160X
EISSN	1872-7034
卷号	156
英文摘要	The Tibet Plateau, with its extensive carbon pools, plays a pivotal role in the global carbon budget. Nevertheless, the driving factors of the carbon dioxide budget remain disputed, and the impact of freeze-thaw process on carbon release is still unclear due to the harsh climate and lack of monitoring data. To clarify the primary factors affecting the alpine meadow ecosystems and to examine the impact of freeze-thaw on carbon release, we employed the LI-8150 automated continuous measurement system. This system, in conjunction with eddy covariance meteorological data, The Boosted Regression Tree (BRT) model, and multiple stepwise regression analysis, were used to analyze the seasonal variations in carbon flux (e.g., net ecosystem carbon exchange [NEE], gross primary productivity [GPP], and ecosystem respiration [R-eco]). We also investigate the carbon sources and sinks in the alpine meadow ecosystem, as well as the predominant factor of carbon flux. Our findings include: (1) the carbon sources and sinks in the alpine meadow ecosystem shift seasonally on monthly and daily scales. On a monthly scale, the ecosystem functions as a moderate carbon sink in June, July, August, and September and as a weak carbon source from October through May. (2) Overall, the alpine meadow ecosystem, located in the northeastern Qinghai Lake basin, serves as a weak carbon sink (-58.53 g C m(-2) year(-1)). (3) Soil temperature is the primary factor driving most variations observed in NEE, Reco, and GPP, contributing 48.05 %, 78.61 %, and 65.05 %, respectively. Soil temperature, soil water dynamics influenced by freeze and thaw processes, and their interaction with plant growth collectively play a crucial role in regulating the carbon sources and sinks in ecosystems. We provide first-hand observational data for monitoring the carbon sources and sinks in the alpine meadow ecosystem of the Tibet Plateau, as well as offer future guidance for studying the carbon budget of the Tibet Plateau.
关键词	Alpine meadow Carbon sink Ecosystem respiration Net ecosystem carbon exchange Gross primary production Chamber
英文关键词	ECOSYSTEM CO2 EXCHANGE; GAP FILLING STRATEGIES; DIOXIDE EXCHANGE; INTERANNUAL VARIABILITY; CHAMBER SYSTEM; CLIMATE-CHANGE; RESPIRATION; PLATEAU; BALANCE; NET
WOS研究方向	Biodiversity Conservation ; Environmental Sciences
WOS记录号	WOS:001095908700001
来源期刊	ECOLOGICAL INDICATORS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283592
作者单位	Beijing Normal University
推荐引用方式 GB/T 7714	Xing, Yuhua,Wang, Pei,Zhang, Dapeng,et al. Convergent control of soil temperature on seasonal carbon flux in Tibetan alpine meadows: An in-situ monitoring study[J],2023,156.
APA	Xing, Yuhua,Wang, Pei,Zhang, Dapeng,Sun, Haitao,&Li, Siying.(2023).Convergent control of soil temperature on seasonal carbon flux in Tibetan alpine meadows: An in-situ monitoring study.ECOLOGICAL INDICATORS,156.
MLA	Xing, Yuhua,et al."Convergent control of soil temperature on seasonal carbon flux in Tibetan alpine meadows: An in-situ monitoring study".ECOLOGICAL INDICATORS 156(2023).