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

	Responses of leaf water potential and gas exchange to the precipitation manipulation in two shrubs on the Chinese Loess Plateau
	Li Yangyang; Chen Jiacun; Ai Shaoshui; Shi Hui
来源期刊	Journal of Arid Land
ISSN	1674-6767
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 (Psi_(pd) and Psi_(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. Psi_(pd), A_n and g_s were higher under irrigation treatment than control for S. psammophila, and these three variables and Psi_(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
收录类别	CSCD
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6696734
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336276
作者单位	Li Yangyang, Institute of Soil and Water Conservation, Northwest A&F University;;Institute of Soil and Water Conservation, Chinese Academy of Sciences, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau;;, Yangling;;Yangling, ;; 712100;;712100.; Chen Jiacun, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling, Shanxi 712100, China.; Ai Shaoshui, Institute of Soil and Water Conservation, Northwest A&F University, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling, Shanxi 712100, China.; Shi Hui, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, 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],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.