干旱区生态环境知识资源中心(Arid): Sap Flow Velocity in Fraxinus pennsylvanica in Response to Water Stress and Microclimatic Variables

Arid

DOI	10.3389/fpls.2022.884526
	Sap Flow Velocity in Fraxinus pennsylvanica in Response to Water Stress and Microclimatic Variables
	Su, Yu; Wang, Xinyu; Sun, Yiqiu; Wu, Hailong
通讯作者	Wu, HL
来源期刊	FRONTIERS IN PLANT SCIENCE
ISSN	1664-462X
出版年	2022
卷号	13
英文摘要	In arid and semiarid regions with water shortage, forestry development is limited by water availability. Understanding how tree sap flow responds to water stress and microclimatic variables is essential for the management of trees and the understanding of the eco-physiological properties of trees in arid areas. In the city of Tianjin in northern China, we measured the sap flow of Fraxinus pennsylvanica, a widely distributed urban greening tree species in semiarid regions of China. We measured the sap flow in four F. pennsylvanica trees over 6 months (April-September 2021), using a thermal diffusion probe method, and simultaneously monitored microclimatic variables and soil moisture. Results indicated that high nighttime sap flow velocity might be produced under the water stress condition. In addition, the nighttime sap flow velocity under the water stress condition was more susceptible to the combined effects of meteorological factors at night. The daytime sap flow velocity exerted a highly significant positive effect on the nighttime sap flow velocity during the whole research period, and the model fit was higher in the early growing season than that in the late growing season (early growing season: R-2 = 0.51, P < 0.01; late growing season: R-2 = 0.36, P < 0.01). Vapor pressure deficit had a positive effect on daytime sap flow. However, net vapor pressure deficit restrained daytime sap flow velocity when the intercorrelation between the microclimatic variables was removed. Our study highlights that drought areas perhaps have higher nighttime sap flow and that more emphasis should be placed on nighttime sap flow and the response of nighttime sap flow to microclimatic variables. In addition, the influence of other microclimatic variables on vapor pressure deficit needs to be considered when analyzing the relationship between daytime sap flow and vapor pressure deficit. An increase in net VPD can suppress the daytime sap flow.
英文关键词	sap flow semiarid regions Fraxinus pennsylvanica driving factors partial correlation
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000802272400001
WOS关键词	METEOROLOGICAL FACTORS ; TRANSPIRATION ; CONDUCTANCE ; TREES ; AREA
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392821
推荐引用方式 GB/T 7714	Su, Yu,Wang, Xinyu,Sun, Yiqiu,et al. Sap Flow Velocity in Fraxinus pennsylvanica in Response to Water Stress and Microclimatic Variables[J],2022,13.
APA	Su, Yu,Wang, Xinyu,Sun, Yiqiu,&Wu, Hailong.(2022).Sap Flow Velocity in Fraxinus pennsylvanica in Response to Water Stress and Microclimatic Variables.FRONTIERS IN PLANT SCIENCE,13.
MLA	Su, Yu,et al."Sap Flow Velocity in Fraxinus pennsylvanica in Response to Water Stress and Microclimatic Variables".FRONTIERS IN PLANT SCIENCE 13(2022).