青冈常绿阔叶林主要树种叶片形态生态研究

青冈常绿阔叶林主要树种叶形基本上都为椭圆形,叶面积在15-40cm2／叶之间,属于中型叶和小型叶;在同一植株上,青冈叶片的大小很好地符合正态分布规律,石栎则近似于负二项分布,甜槠和木荷接近正态分布;主要树种叶的大小是优势种青冈>次优势种石栎>其它伴生种,这在群落结构分化中具有适应意义,即其“生长策略”不同;同一树种叶片大小为中层木叶片>上层木叶片;春夏换叶之前,叶大小和叶重达到第一高峰,秋冬季出现第二峰,叶比重为秋、冬季>春、夏季,这是常绿植物对季节性不利气候(冬季寒冷,夏季高温伏旱)的一种生态适应。

A Study on the Morpho-Ecology of the Leaves of the Main Species in the Evergreen Broad-Leaved Forest Dominated by Cyclobalanopsis glauca

The leaf morphology of the main species in the evergreen broad-leaved forest dominated by Cyclobalanopsis glauca was ellips roughly, and the area was between 15- 40 cm2/leaf. The leaves belong to middle and small type leaf; The size of the leaves in a tree were in conformity to the normal distribution except for Lithocarpus; The leaf size of the main species was C. glauca (dominant species) > L. glaber (sub-dominant species) > other species, that was an ecological adaptation in the community structure differentiation, i.e. they have the different "growth strateges" of the species; The leaf size of the same specis was upper layer individiual leaves < middle layer individual leaves; The leaf size reached the first peak during the spring-summer and the second peak during late autumn-winter, the specific weight of the leaf was higher in autumn and winter than in spring and summer, that was the adaptation of the evergreen trees to the seasonal unfavorabale climate.