CAS Workshop on Ecosystem Succession Theory and Practice of Ecological Restoration 

中国南亚热带植被演替的生理生态学解释 

高琼¹  彭少麟²  赵平²  曾小平²  蔡锡安²  刘颖慧¹

（¹北京师范大学资源科学研究所，教育部环境演变和灾害重点实验室，北京 100875；²中国科学院华南植物研究所，广州 510650）

 摘要：气孔导度模型和光合作用速率模型被用于中国南亚热带属于针叶树、阳性阔叶树、中生性阔叶树三个功能型的7种植物的野外测定的叶片光合和蒸腾数据。非线性回归被用来获取模型中的抗旱、耐旱、以及生物化学光合作用能力等参数。分析结果说明这些模型足以描述从旱季到湿季这些植物的生理生态学行为。从针叶树到阳性阔叶树到中生性阔叶树的演替过程可以被量化为这些物种在耐旱-抗旱能力和生化光合能力的差异。我们发现了，从针叶树到阳性阔叶树到中生性阔叶树，耐旱-抗旱能力下降，但生化光合能力增加。植被的演替可以解释为三个功能型的植物在生理生态学特性方面的差异和土壤物理性状的改变反馈的结果。

关键词：气孔导度；光合；同化；协同；模型

Explanation of vegetation succession in subtropical southern China in light of ecophysiological characteristics of plant species

Gao Qiong ¹  Peng Shaolin ²  Zhao Ping ²  Zeng Xiaoping ²  Cai Xi’an ²  Liu Yinghui ¹

(¹MOE Key Lab of Environmental Change and Natural Disasters, Institute of Resources Science, Beijing Normal University, Beijing 100875, China; ²Southern China Institute of Botany, Chinese Academy of Sciences, Guangzhou 510650, China)

Abstract: A stomatal conductance model and a photosynthesis model were applied to field observations on leaf transpiration and photosynthesis of 7 tress species in subtropical southern China. Parameters of drought resistance and tolerance and biochemical assimilation capacity were obtained using nonlinear statistical regression. The analysis indicated that the models were adequate to describe the ecophysiological behavior of these trees under various environmental conditions. Species succession from coniferous pines to heliophilus broadleaf to mesophilus broadleaf trees was quantified in light of the parameters of biochemical assimilation capacity and drought- resistance and tolerance of plants. We found a general pattern of decreased drought resistance and tolerance, but increased biochemical assimilation capacity from pines to heliophilus broadleaf to mesophilus broadleaf trees. Succession was explainable in light of these physiological characteristics together with the positive feedbacks from changes in soil physical properties.

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