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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (8): 2423-2430.doi: 10.13287/j.1001-9332.201708.014

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Impact of land pavement on photosynthetic characteristics of common greening trees in Beijing, China

WANG Xu-ming1,2, CHEN Yuan-yuan1,2, WANG Xiao-ke1*   

  1. 1State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
    2University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-12-22 Published:2017-08-18
  • Contact: * E-mail: wangxk@rcees.ac.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41571035)

Abstract: Land pavement has impacted urban tree growth and its ecosystem service, and it is necessary to investigate the key physiological processes of urban trees grown under land pavement. To study the impact of land pavement on photosynthetic characteristics of common greening trees in Beijing, a field experiment was designed with three treatments: the control (the non-paved), pervious pavement and impervious pavement, and the leaf net photosynthetic rates and related physiological-ecological parameters of two common greening trees (Fraxinus chinensis and Acer truncatum) in Beijing were measured in the 4th year after planting. Results showed that the photosynthesis of F. chinensis and A. truncatum showed different responses to different types of pavement, the net photosynthetic rate was significantly decreased for F. chinensis under both pervious and impervious pavements and for A. truncatum only under impervious pavement. The air relative humidity and soil volumetric water content under pervious and impervious pavements were lower than that under the control, which reduced water amount available for trees. The lower net photosynthetic rates of F. chinensis and A. truncatum under impervious pavement were mainly attributed to the decrease in leaf stomatal conductance. The PSⅡ effective photochemical quantum yield (Fv′/Fm′) of F. chinensis was significantly lower under pervious and impervious pavements, while the PSⅡ actual photochemical quantum efficiency (ΦPSⅡ) and apparent electron transport rate (ETR) of A. truncatum were significantly higher under impervious pavement.