干旱区生态环境知识资源中心(Arid): Hydraulic Sensitivity and Stomatal Regulation of Two Desert Riparian Species

Arid

DOI	10.1029/2022JG006971
	Hydraulic Sensitivity and Stomatal Regulation of Two Desert Riparian Species
	Bai, Yan; Liu, Yanlan; Kueppers, Lara M.; Li, Engui; Zhang, Cicheng; Yu, Kailiang; Yang, Xiaofan; Li, Xiaoyan
通讯作者	Li, XY
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN	2169-8953
EISSN	2169-8961
出版年	2022
卷号	127 期号:10
英文摘要	Characterizing plant response to water stresses is among the keys to understanding ecosystem functions. Despite increasing recognition of plant hydraulic and stomatal dynamics not captured by isohydricity, defined as the sensitivity of leaf water potential psi(l) to soil water potential, it remains unclear which plant traits are critical to improved representation of plant hydraulic and stomatal dynamics beyond isohydricity, especially in dryland ecosystems. Here, we examine eco-physiological responses of two typical desert riparian species, Populus euphratica and Tamarix ramosissima, to hydro-meteorological variations. Based on measured hydraulic traits, variations of psi(l), leaf gas exchange, groundwater table, and soil moisture across vertical profiles, we investigated how subsurface hydraulic conditions control plant hydraulic sensitivity and stomatal regulation. We found both species exhibited anisohydric behaviors, which, however, were attributed to drying soil at different depths because of root distributions. The similar anisohydric behaviors also led to distinct stomatal regulation, due to the impact of atmospheric dryness decoupled from soil moisture and different sensitivities of stomatal conductance (g(s)) to psi(l). The latter was found to be dynamic throughout the growing season, which dominated the seasonal variation of g(s) and thus should not be neglected. The results suggest similar anisohydric behaviors could imply diverging hydraulic behaviors as the evaporate demand and flow regime change. Root morphological trait and stomatal sensitivity to psi(l) are identified as keys to characterize responses to water stresses in desert riparian ecosystems. Our findings highlight that improved measurements and representations of these traits could contribute to better assessments of dryland ecosystem functions.
英文关键词	isohydricity hydraulic traits groundwater water use stomatal conductance
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000869081600001
WOS关键词	COMMUNITY LAND MODEL ; PLANT WATER-USE ; NIGHTTIME TRANSPIRATION ; VULNERABILITY CURVES ; POPULUS-EUPHRATICA ; TREE MORTALITY ; ARID REGION ; DROUGHT ; RESPONSES ; BEHAVIOR
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/393461
推荐引用方式 GB/T 7714	Bai, Yan,Liu, Yanlan,Kueppers, Lara M.,et al. Hydraulic Sensitivity and Stomatal Regulation of Two Desert Riparian Species[J],2022,127(10).
APA	Bai, Yan.,Liu, Yanlan.,Kueppers, Lara M..,Li, Engui.,Zhang, Cicheng.,...&Li, Xiaoyan.(2022).Hydraulic Sensitivity and Stomatal Regulation of Two Desert Riparian Species.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,127(10).
MLA	Bai, Yan,et al."Hydraulic Sensitivity and Stomatal Regulation of Two Desert Riparian Species".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 127.10(2022).