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作 者 ：郭连生,田有亮

期 刊 ：生态学报 1994年 14卷 2期 页码：136~141

关键词：针叶幼树；光合生理特性；大气相时湿度。；

Keywords:saplings of conifer, photosynthetic characters . air humidity.,

摘 要 ：应用225MK₃IRGA（英ADC公司）在室内控制的环境条件下测定研究了侧柏、樟子松、油松和白等4种针叶幼树的净光合速率、暗呼吸强度、光补偿点与大气湿度的关系，研究结果证明：各种幼树的净光合速率均随大气湿度的降低而减弱，二者之间的关系可用y＝a＋blnx方程表达。其变化速率（b）　在树种间有明显差异，它可以反映出不同树种对大气干旱忍耐力即抗旱性的差异。“b”值小的树种表明其抗旱性强。依此排列出的上述4种幼树的抗旱性强弱顺序与应用PV技术所测抗旱性水分生理指标所排顺序一致。大气湿度的下降亦能明显提高幼树的暗呼吸强度和光补偿点。

Abstract:The relationship between the air humidity and the rate of the net photosynthesis,ten-dency of respiration and the compensation point of light quantum of saplings of four conifer-ous species. Namely . Platycladus orientaris , Pinus sylvestris var. mongolica , P. tabulaeformisand Picea meyeri were measured and studied by using 225MK₃IRGA(ADC) under the con-trolled indoor conditions. The results show that all the rates of net photosynthesis in thefour species of salings declined with decreasing air humidity an...

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