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Photosynthetic and water-related physiological characteristics of Periploca sepium in response to changing soil water conditions in a shell sand habitat

引用

Journal of Forestry Research 2023年第2期34卷 453-467页

作者： Xiao Wang Jiangbao Xia Ximei Zhao Mingming Dong Xianshuang Xing Ying Fang Qinqin Fu Zhaohua Lu Institute of Restoration Ecology School of Chemical and Environmental EngineeringChina University of Mining and Technology(Beijing)Beijing 100083People’s Republic of China Shandong Provincial Key Laboratory of Eco-Environmental Science for Yellow River Delta Binzhou UniversityBinzhou 256603People’s Republic of China Shandong Hydrology Center Jinan 250013People’s Republic of China

This study was performed to observe the effects of water on photosynthesis and water-related physiology in dominant shrubs in shell sand ***-year-old Periploca sepium seedlings were used as model species.A gradient of 12 water levels was established by artificially supplying the shell sand with water up to saturation and then allowing natural evapotranspiration to *** photo synthetic,chlorophyll fluorescence and stem sap flow parameters of *** were measured under a range of water *** different soil water conditions were classified according to the responses of these parameters.(1)With the increase in the relative water content(RWC)of the shell sand,the parameters of leaf photosynthesis,chlorophyll fluorescence and water-related physiology in *** showed significant critical *** net photo synthetic rate(Pn),transpiration rate(Tr),instantaneous water use efficiency(WUE),potential water use efficiency(WUEi),maximum photochemical efficiency(Fv/Fm),actual photochemical efficiency(ΦPSII)and daily accumulation of stem sap flow all increased first and then decreased with increasing RWC,but the corresponding water conditions associated with their maximum values were not the *** RWC of 69.40%was determined to be the optimal water condition for photosynthesis and water-related physiological activity in *** an RWC of 36.61%,the mechanism of photosynthetic inhibition in *** changed from stomatal limitation to nonstomatal limitation;this was also the minimum water requirement for maintaining normal photo synthetic *** RWC of 50.27%resulted in the highest WUE in ***,indicating that moderate drought stress increased WUE.(2)Based on the quantitative relationship between the photo synthetic parameters of *** and the shell sand water gradient,the soil water availability was classified into 6 water *** RWC range for maintaining strong photosynthesis and high WUE in *** was 63.22-69.98%.(3)Gas

关键词： water gradient range Periploca sepium Photosynthesis water physiology water availability classifi cation Shell sand

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