摘要: |
对广东省河源地区桉树人工林生长与光合特性的季节变化进行研究,结果表明:(1)桉树人工林不同月份之间的胸径和树高差异显著(P<0.05),其中树高2010年10月比2010年7月增长243.30%, 2011年4月比2010年10月仅增长26.73%;(2)光合参数也存在着明显的季节变化,净光合速率、水分利用效率和气孔导度从大到小按时间排序分别是2010年10月、2011年4月、2010年7月,其中2010年10月的净光合速率和水分利用效率分别达到22.39 μmol·m-2·s-1、4.19 μmol·mmol-1;(3)2010年7~10月桉树人工林生长迅速,2010年10月至2011年4月生长变得缓慢。 |
关键词: 桉树人工林〓生长特性〓光合特性 |
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基金项目:广东省科技计划项目“桉树人工林精准施肥配套技术研究”(2010B020303006)。 |
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Seasonal Variations of Growth and Photosynthetic Characteristics \=of Eucalyptus Plantation |
wang lipeng,He Qian,Li Jiyue,Yan Ziyi,Su Yan,Peng Zi,Qi Tao,Xie Dexin
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College of Forestry, South China Agricultural University
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Abstract: |
We studied the seasonal variations of the growth and photosynthetic characteristics of Eucalyptus plantation in Heyuan. The results were as follows: The heights and DBH of Eucalyptus plantation in different months were significantly different from each other (P<0.05). The tree height increased 241.37% from July to October 2010, while 26.85% from October 2010 to April 2011. There is obvious seasonal variation in photosynthetic characteristics, the order of net photosynthetic rate (Pn), water use efficiency (WUE) and stomatal conductance in different months is October 2010>April 2011>July 2010, and, the Pn and WUE in October 2010 were 22.39 μmol CO2 m-2 s-1 and 4.19 μmol CO2·mmol H2O-1, respectively. From July 2010 to October 2010, Eucalyptus plantation grew rapidly, but from October 2010 to Apirl 2011, the growth of Eucalyptus plantation become slow. |
Key words: Eucalyptus plantation, growth characteristics, photosynthetic characteristics |