How Soil Moisture Affects Photosynthetic Characteristics of Aralia elata Leaves
Jie Zhao 1  
Rui Yang 1  
Xiaohua Liu 1  
Guangcan Zhang 1  
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Shandong Province Key Laboratory of Soil Erosion and Ecological Restoration, Key Laboratory of Agricultural Ecology and Environment, Forestry College, Shandong Agricultural University, Taian, 271018, China
Shuyong Zhang   

Forestry College, Shandong Agricultural University, Taian, Shandong Agricultural University, Taian, 271018 Taian, China
Online publish date: 2018-03-12
Publish date: 2018-03-30
Submission date: 2017-07-20
Final revision date: 2017-09-05
Acceptance date: 2017-09-18
Pol. J. Environ. Stud. 2018;27(4):1869–1877
Using a CIRAS-2 portable photosynthesis system, the photosynthesis, transpiration, and light responses of Aralia elata were studied under different soil moisture values with the aim of understanding the adaptability of this species to different light and soil water conditions. The results showed that the net photosynthetic rate (Pn), transpiration rate (Tr), and water use efficiency (WUE) of A. elata varied in response to different levels of photon flux density (PFD). When PFD was between 800 and 1,800 μmol m-2 s-1, Pn changed little in response to the increasing light intensity, whereas Tr decreased gradually and WUE increased significantly. Light saturation point (LSP) and light compensation point (LCP) were approximately 800 and 30 μmol m-2 s-1, respectively. The soil water content had little effect on LSP and LCP, but significantly affected photosynthetic quantum efficiency (Φ) and dark respiratory rate (Rd). By defining the Pn and WUE as the indexes of plant productivity and soil water efficiency, respectively, the soil moisture availability and productivity of A. elata were graded and evaluated, and six types of soil water grading were established. Thus, at RWC values between 44.5% and 79.2% in which both Pn and WUE were maintained at a high level, the results can provide theoretical support for highly productive and efficienct water management in A. elata.