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Bulletin of Botanical Research ›› 2023, Vol. 43 ›› Issue (6): 846-856.doi: 10.7525/j.issn.1673-5102.2023.06.007

• Physiology and Ecology • Previous Articles     Next Articles

Effects of Different Pruning Treatments on Growth and Photosynthetic Characteristics of 10-year-old Triploid Populus tomentosa

Tianmeng REN1, Yu BAO1, Yaxun SU2, Qingbin CHEN2, Liying WEI2, Ruoxuan JI1, Xiao YU1, Xinli XIA1, Weilun YIN1, Chao LIU1()   

  1. 1.College of Biological Sciences and Technology,Beijing Forestry University,Beijing 100083
    2.Jinglan North Pioneering Gardens Share Co. ,Ltd. ,Tianjin 300000
  • Received:2023-02-22 Online:2023-11-20 Published:2023-11-08
  • Contact: Chao LIU E-mail:liuchao1306@bjfu.edu.cn
  • About author:REN Tianmeng(1996—),male,postgraduate,mainly engaged in the research of tree stress biology.

Abstract:

In order to explore the response of photosynthetic physiological characteristics to different pruning intensities in Populus of middle and high forest age, 10-year-old triploid Populustomentosa asexual lines B301 and S86 were used as materials, light pruning(pruning the lower 1/3 of the canopy) and heavy pruning(pruning the lower 1/2 of the canopy) and unpruned trees as the control were adopted respectively. The results showed that pruning had no significant effect on the growth rate of height, diameter at breast height and wood volume of 10-year-old Populus, but heavy pruning increased the net photosynthetic rate(Pn), transpiration rate(Tr), and stomatal conductance(Gs) of their remaining leaves and enhanced material synthesis at the single-leaf level, while pruning had no significant effect on instantaneous water use efficiency(WUE). From a comprehensive analysis of growth and physiology, pruning the lower 1/2 of the canopy could improve the physiological condition of 10-year-old Populus tomentosa, but had no significant effect on the growth of the stand.

Key words: 10-year-old, triploid Populus tomentosa, pruning, growth, photosynthetic characteristics

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