Leaf Temperature and Vapour Pressure Deficit (VPD) Driving Stomatal Conductance and Biochemical Processes of Leaf Photosynthetic Rate in a Subtropical Evergreen Coniferous Plantation

Yue Li, Lei Zhou, Shaoqiang Wang, Yonggang Chi and Jinghua Chen
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Yue Li: Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
Lei Zhou: College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
Shaoqiang Wang: Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
Yonggang Chi: College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
Jinghua Chen: Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

Sustainability, 2018, vol. 10, issue 11, 1-13

Abstract: Photosynthesis is arguably the most important biochemical process on Earth, which is dramatically influenced by environmental conditions. How environmental factors drive stomatal conductance and biochemical processes of leaf photosynthetic rate has not been sufficiently investigated in subtropical China. In this study, we analysed the effects of stomatal and biochemical parameters on the photosynthetic rate of native Masson’s pine ( Pinus massoniana Lamb.) and exotic slash pine ( Pinus elliottii Engelm.) in response to leaf temperature and vapour pressure deficit (VPD) in subtropical China, based on leaf gas exchange measurements in 2016. Our results showed that there was no significant difference in the light-saturated photosynthetic rate (A sat ) between native Masson’s pine and exotic slash pine. The seasonal patterns of maximum rate of the carboxylation (V cmax25 ) were basically consistent with seasonal patterns of A sat for both species. The positive effect of leaf temperature on A sat was mainly produced through its positive effect on V cmax25 . Leaf temperature had no significant effect on stomatal conductance. V cmax25 and g s simultaneously affected A sat in response to VPD. Our results highlighted the importance of biochemical processes in limiting leaf photosynthetic rate in response to environmental conditions in subtropical evergreen coniferous plantations.

Keywords: seasonal variations; photosynthetic rate; V cmax25; J max25; stomatal conductance; climate (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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