气候变化领域集成服务门户(CCPortal): Characterization and drivers of water and carbon fluxes dynamics in dune ecosystems of the Horqin Sandy Land

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DOI	10.1016/j.scitotenv.2024.170517
	Characterization and drivers of water and carbon fluxes dynamics in dune ecosystems of the Horqin Sandy Land
	Zhang, Simin; Liu, Tingxi; Duan, Limin; Hao, Lina; Tong, Xin; Jia, Tianyu; Li, Xia; Lun, Shuo
发表日期	2024
ISSN	0048-9697
EISSN	1879-1026
起始页码	918
卷号	918
英文摘要	Sandy regions constitute pivotal components of terrestrial ecosystems, exerting significant influences on global ecological equilibrium and security. This study meticulously explored water and carbon fluxes dynamics within a dune ecosystem in the Horqin Sandy Land throughout the growing seasons from 2013 to 2022 by employing an advanced eddy covariance system. The dynamic characteristics of these fluxes and their underlying driving forces were extensively analyzed, with a particular focus on the impact of precipitation. The main results are as follows: (1) During the growing seasons of 2015 and 2016, the dune ecosystem acted as a modest carbon source, while in 2013, 2014, and 2017- 2022, it transformed into a net carbon sink. Notably, the annual mean values of water use efficiency (WUE) and evapotranspiration (ET) were 5.16 gC & sdot;kg  1H2O and 255.4 mm, respectively. (2) The intensity, frequency, and temporal distribution of precipitation were found to significantly influence the carbon and water fluxes dynamics. Isolated minor precipitation events did not trigger substantial fluctuations, but substantial and prolonged precipitation events spanning multiple days or consecutive minor precipitation events resulted in notable assimilation delays. (3) Air temperature, soil temperature, and fractional vegetation cover (FVC) were found to be key factors influencing the carbon and water fluxes. Specifically, FVC exhibited a negative logarithmic correlation with net ecosystem CO2 exchange (NEE) and a power function relationship with WUE. (4) The interaction between carbon and water fluxes is exhibited by exponential increases in ecosystem respiration (Reco) and gross primary productivity (GPP) with WUE, while NEE displayed an exponential decrease in relation to WUE. These findings are of high significance in predicting the potential ramifications of climate change on the intricate carbon and water cycles, and enhance our understanding of ecosystem dynamics in sandy environments.
英文关键词	Horqin Sandy Land; Carbon flux; Water use efficiency; Net ecosystemCO2 exchange; Climate change
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001178897300001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290197
作者单位	Inner Mongolia Agricultural University
推荐引用方式 GB/T 7714	Zhang, Simin,Liu, Tingxi,Duan, Limin,et al. Characterization and drivers of water and carbon fluxes dynamics in dune ecosystems of the Horqin Sandy Land[J],2024,918.
APA	Zhang, Simin.,Liu, Tingxi.,Duan, Limin.,Hao, Lina.,Tong, Xin.,...&Lun, Shuo.(2024).Characterization and drivers of water and carbon fluxes dynamics in dune ecosystems of the Horqin Sandy Land.SCIENCE OF THE TOTAL ENVIRONMENT,918.
MLA	Zhang, Simin,et al."Characterization and drivers of water and carbon fluxes dynamics in dune ecosystems of the Horqin Sandy Land".SCIENCE OF THE TOTAL ENVIRONMENT 918(2024).