Arid
DOI10.1007/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, Yangyang1,2; Chen, Jiacun2; Ai, Shaoshui1; Shi, Hui3
Corresponding AuthorLi, Yangyang
JournalJOURNAL OF ARID LAND
ISSN1674-6767
EISSN2194-7783
Year Published2020
Abstract in English

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.


Keyword in Englishdrought irrigation leaf water potential gas exchange acclimation
SubtypeArticle ; Early Access
Language英语
CountryPeoples R China
Indexed BySCI-E
WOS IDWOS:000522574200001
WOS KeywordQUERCUS-ILEX ; PHOTOSYNTHETIC CAPACITY ; DROUGHT ; SENSITIVITY ; PLANTS ; ACCLIMATION ; ADAPTATIONS ; LIMITATIONS ; MORTALITY ; RAINFALL
WOS SubjectEnvironmental Sciences
WOS Research AreaEnvironmental Sciences & Ecology
Document Type期刊论文
Identifierhttp://119.78.100.177/qdio/handle/2XILL650/314890
Affiliation1.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
Recommended Citation
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.
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.
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 (2020).
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