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    上海市公园绿地植物群落冠层结构定量化研究

    关键词:园林植物;植物群落;冠层结构;叶面积指数;定量化

    Key words:landscape plants; plant community; canopy structure; LAI; quantification

    摘要:冠层是植物群落进行生理活动的重要媒介,群落冠层结构的研究对于解释与估算植物群落生长活力与生态效益具有重要意义。选取上海地区公园绿地较为常见的群落类型为研究对象,基于半球影像技术对植物群落冠层结构进行了定量化研究。研究结果表明:不同树种组成的群落冠层结构特征之间存在一定差异:冠层空隙度(Gap Fraction)的变化范围为6.5%~39.5%;叶面积指数(LAI)的变化范围为1.50~3.65。研究比较了不同径阶下的冠层结构指标:群落冠层空隙度随着胸径增加而降低,群落叶面积指数随着胸径增加而升高。冠层结构量化研究为构建复层的、多样性的和稳定性的群落结构提供基础分析与参考。

    Abstract:Canopy is the important carrier of physiological activity of plant community. The research on canopy structure has important significance to explain and estimate the growth vigor and ecological benefits of plant communities. In this paper, the common types of plant communities of public green space in Shanghai are selected. The canopy structures of plant community are quantified using hemisphere image technology. The research results show that there are some differences in canopy structure characteristics of different types of plant communities. The values of canopy gap fraction range from 6.5% to 39.5%. The values of LAI range from 1.50 to 3.65. The value of canopy gap fraction is decreased with the increase of diameter at breast height. The value of canopy gap fraction is increased with the increase of diameter at breast height. This study shows basic analysis and reference for establishing the plant communities with structure of multi-layer, diversity and stability.

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