蒙古栎群落叶型的分析

1　引　　言叶的大小即叶型是群落的重要外貌特征之一 ,与群落的生产率有关 ;叶子的形态与气候有密切的关系 ,一个扩展着的叶片所能达到的最大程度 ,受温度和湿度有效性的影响 ;大的叶片经常地出现于热带温暖而潮湿的气候中 ,而小的叶片则是十分干燥和寒冷地区植物的特征1] .对于不同的群落的叶型分析 ,前人已做了一些研究 ,如对常绿阔叶林和季雨林的群落学研究2～ 4 ] 及北方落叶林的群落学研究5,6] .另一个与气候相关联的叶子特征是叶子的叶缘 ,有关方面的研究资料比较少 .据研究 ,在一个植物区系的双子叶乔木中全缘叶植物种的百分率 ,…

Analysis on leaf forms in Quercus mongolica community

Leaf-size classes of 337 vascular plants in Quercus mongolica community in northeast, China were analyzed according to Raunkiaer system. The dominant type was microphyll which percentage is 45.4%,followed by compound leaf (23.1%),mesophyll ( 22.6%),nanophyll (6.8%),macrophyll (0.9%),aphyllous (0.9%),leptophyll ( 0.3%).The leaves edges of 337 plants were investigated and the percentage of entire leaves plants is 22.3%.Leaf-size classes spectra of trees,shrubs and herbs were figured out.The mesophyll ratio in trees was higher than that in shrubs and herbs.The mesophyll ratio in shrubs was the lowest.Different sites had different leaf-size classes spectra.Microphyll also was the dominant type in every site.No significant relationships were found between leaf-size classes spectra and latitude and altitued.