干旱区生态环境知识资源中心(Arid): Dynamics of carbon and water vapor fluxes in three typical ecosystems of Heihe River Basin, Northwestern China

Arid

DOI	10.1016/j.scitotenv.2024.172611
	Dynamics of carbon and water vapor fluxes in three typical ecosystems of Heihe River Basin, Northwestern China
	Ding, Zhiyong; Wang, Yuyang; Ding, Jinzhi; Ren, Zhiguo; Liao, Jie
通讯作者	Wang, YY
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2024
卷号	929
英文摘要	Understanding the dynamics of carbon and water vapor fluxes in arid inland river basin ecosystems is essential for predicting and assessing the regional carbon-water budget amid climate change. However, studies aiming to unravel the mechanisms driving the variations and coupling process of regional carbon-water budget in a changing environment in arid regions are limited. Here, we used the eddy covariance technique to analyze the relationship between CO2 and H2O fluxes in three typical ecosystems across the upper, middle, and lower reaches of an arid inland river basin in Northwestern China. Our results showed that all ecosystems acted as carbon sinks, with the alpine swamp meadow, cropland, and desert shrubland sequestrating 300.2 +/- 0.01, 644.8 +/- 2.9, and 203.7 +/- 22.5 g C m(-2) yr(-1), respectively. Air temperature (T-a) primarily controlled daily gross primary productivity (GPP) and net ecosystem CO2 exchange (NEE) in the irrigated cropland during the growing season, while soil temperature (T-s) and vapor pressure deficit (VPD) regulated these parameters in the alpine swamp meadow and desert shrubland. Additionally, T-a and net radiation (R-n) controlled daily evapotranspiration (ET) in cropland, while T-s and R-n regulated ET at other sites. Consequently, carbon and water vapor fluxes of all three ecosystems tended to be energy-limited during the growing season. The differential responses of carbon and water vapor fluxes in the upper, middle, and lower reaches of these ecosystems to biophysical factors determined their distinct coupling and variations in water use efficiency. Notably, the desert shrub ecosystem in the lower reach of the basin maintained a stable balance between carbon gain and water loss, indicating adaptation to aridity. This study provides valuable insights into the underlying mechanisms behind the changes in carbon and water vapor fluxes and water-use efficiency in arid river basin ecosystems.
英文关键词	Net ecosystem CO2 exchange (NEE) Evapotranspiration (ET) Coupling Water use efficiency Arid region
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001298464300001
WOS关键词	USE EFFICIENCY ; ALPINE MEADOW ; EDDY-COVARIANCE ; EXCHANGE ; ENERGY ; CO2 ; ASSIMILATION ; TEMPERATURE ; VARIABILITY ; REGRESSION
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405493
推荐引用方式 GB/T 7714	Ding, Zhiyong,Wang, Yuyang,Ding, Jinzhi,et al. Dynamics of carbon and water vapor fluxes in three typical ecosystems of Heihe River Basin, Northwestern China[J],2024,929.
APA	Ding, Zhiyong,Wang, Yuyang,Ding, Jinzhi,Ren, Zhiguo,&Liao, Jie.(2024).Dynamics of carbon and water vapor fluxes in three typical ecosystems of Heihe River Basin, Northwestern China.SCIENCE OF THE TOTAL ENVIRONMENT,929.
MLA	Ding, Zhiyong,et al."Dynamics of carbon and water vapor fluxes in three typical ecosystems of Heihe River Basin, Northwestern China".SCIENCE OF THE TOTAL ENVIRONMENT 929(2024).