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Bulletin of Botanical Research ›› 2006, Vol. 26 ›› Issue (5): 600-608.doi: 10.7525/j.issn.1673-5102.2006.05.018

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A comparison of photosynthethetic characteristics in four poplar clones

DENG Song-Lu;DI Xiao-Yan;WANG Meng-Ben*;CHEN Jian-Wen;ZHANG Wei-Feng;REN Jian-Zhong;ZHOU Yu-Quan;LIU Cun-Ping   

  1. (1.Institute of Loess Plateau, Shanxi University, Taiyuan 030006) (2.Poplar Experimental Bureau of Shanxi Province, Datong 037006)
  • Received:1900-01-01 Revised:1900-01-01 Online:2006-09-20 Published:2006-09-20
  • Contact: WANG Meng-Ben
  • Supported by:

Abstract: The photosynthetic characteristics and the relationship of net photosynthetic rate, water use efficiency with the environmental factors and stomatal conductance in four new poplar clones (3#、6#、8#、9#) were studied. The results showed that the peak value of the diurnal courses of the photosynthetic rate generally appeared around 10:00, and then reduced gradually. The diurnal courses of transpiration rate in different months were different. The peak value of the diurnal courses of stomatal conductance generally appeared at 7:00~9:00. The total mean net photosynthetic rate(μmol CO2·m-2·s-1), transpiration rate (mmol H2O·m-2·s-1) and water use efficiency (mmol CO2·mol-1 H2O) had following order in June, July and August respectively: Clone 9#(8.53)>6#(7.21)>3#(6.47)>8#(4.98); Clone 9#(3.74)>3#(2.76)>6#(1.76)>8#(1.47); Clone 8#(4.77)>6#(4.35)>3#(2.99)>9#(2.40). Clone 9# had higher net photosynthetic rate and transpiration rate, with lower water use efficiency. On the contrary, clone 8# had lower net photosynthetic rate and transpiration rate, with higher water use efficiency. Net photosynthetic rate and water use efficiency had a close relationship with the air temperature and relative humidity in 6#, and had a close relationship with the photosynthetic active radiation and stomatal conductance in 3#、8# and 9#.

Key words: photosynthetic rate, transpiration rate, photosynthetic active radiation, stomatal conductance, water use efficiency

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