干旱区生态环境知识资源中心(Arid): Responses of leaf water potential and gas exchange to the precipitation manipulation in two shrubs on the Chinese Loess Plateau

Arid

DOI	10.1007/s40333-020-0008-7
	Responses of leaf water potential and gas exchange to the precipitation manipulation in two shrubs on the Chinese Loess Plateau
	Li, Yangyang 1,2; Chen, Jiacun 2; Ai, Shaoshui 1; Shi, Hui 3
通讯作者	Li, Yangyang
来源期刊	JOURNAL OF ARID LAND
ISSN	1674-6767
EISSN	2194-7783
出版年	2020
卷号	12 期号:2 页码:267-282
英文摘要	Regulation of leaf gas exchange plays an important role in the survival of trees and shrubs under future climate change. However, the responses of leaf water potential and gas exchange of shrubs in semi-arid areas to the precipitation alteration are not clear. Here, we conducted a manipulated experiment with three levels of precipitation, i.e., a control with ambient precipitation, 50% above ambient precipitation (irrigation treatment), and 50% below ambient precipitation (drought treatment), with two common shrubs, Salix psammophila C. Wang & C. Y. Yang (isohydric plant, maintaining a constant leaf water potential by stomatal regulation) and Caragana korshinskii Kom. (anisohydric plant, having more variable leaf water potential), on the Chinese Loess Plateau in 2014 and 2015. We measured the seasonal variations of predawn and midday leaf water potential (omega(pd) and omega(md)), two parameters of gas exchange, i.e., light-saturated assimilation (A(n)) and stomatal conductance (g(s)), and other foliar and canopy traits. The isohydric S. psammophila had a similar A(n) and a higher g(s) than the anisohydric C. korshinskii under drought treatment in 2015, inconsistent with the view that photosynthetic capacity of anisohydric plants is higher than isohydric plants under severe drought. The two shrubs differently responded to precipitation manipulation. omega(pd), A(n) and g(s) were higher under irrigation treatment than control for S. psammophila, and these three variables and omega(md) were significantly higher under irrigation treatment and lower under drought treatment than control for C. korshinskii. Leaf water potential and gas exchange responded to manipulated precipitation more strongly for C. korshinskii than for S. psammophila. However, precipitation manipulation did not alter the sensitivity of leaf gas exchange to vapor-pressure deficit and soil moisture in these two shrubs. Acclimation to long-term changes in soil moisture in these two shrubs was primarily attributed to the changes in leaf or canopy structure rather than leaf gas exchange. These findings will be useful for modeling canopy water-carbon exchange and elucidating the adaptive strategies of these two shrubs to future changes in precipitation.
英文关键词	drought irrigation leaf water potential gas exchange acclimation
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000522574200001
WOS关键词	QUERCUS-ILEX ; PHOTOSYNTHETIC CAPACITY ; DROUGHT ; SENSITIVITY ; PLANTS ; ACCLIMATION ; ADAPTATIONS ; LIMITATIONS ; MORTALITY ; RAINFALL
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314890
作者单位	1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China; 2.Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China; 3.Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Xian 710055, Peoples R China
推荐引用方式 GB/T 7714	Li, Yangyang,Chen, Jiacun,Ai, Shaoshui,et al. Responses of leaf water potential and gas exchange to the precipitation manipulation in two shrubs on the Chinese Loess Plateau[J]. 西北农林科技大学,2020,12(2):267-282.
APA	Li, Yangyang,Chen, Jiacun,Ai, Shaoshui,&Shi, Hui.(2020).Responses of leaf water potential and gas exchange to the precipitation manipulation in two shrubs on the Chinese Loess Plateau.JOURNAL OF ARID LAND,12(2),267-282.
MLA	Li, Yangyang,et al."Responses of leaf water potential and gas exchange to the precipitation manipulation in two shrubs on the Chinese Loess Plateau".JOURNAL OF ARID LAND 12.2(2020):267-282.