无量山半湿润常绿阔叶林的区系特征及保护生物学意义

无量山半湿润常绿阔叶林是其垂直带上重要的植被类型，目前面临被彻底毁灭的危险，从这类森林及相应地段的177种优势和常见植物的种类结构分析看，只有热带亚洲的成分，东亚中的中国－喜马拉雅成分和中国特有成分贯穿乔木A，B，C层，灌木层，草本和层外植物几大类中，而中国特有种的进一步分析表明了它的区系成分的亚热带性质，温带性质不是很显著，在无量半山湿润常绿阔叶林地段，还存在一些原生植被破坏后产生的次生落叶阔叶加以保护，因之有这么多的特点，加之其为重要特有类群和保护种类聚集的场所，该类植被明显具有不同层次的保护生物学意义。

The Floristic Characteristics and Its Significance in Conservat ion of Semi-humid Evergreen Broad-leaved Forests

The semi-humid evergreen broad-leaved forest is an important vegetation type in vertical zone of the Mts. Wuliangshan, which is on the edge of extinction. Based on the analysis of the disposition in vertical structure of 177 dominant and frequent species in the forest and in other areas of the mountains, it shows that there are only Tropical Asia, Sino-Himalayan and Chinese endemic elements appearing in all the synusiae from the canopy to the ground layer, including A, B and C tree layers, shrub layer ground layer and inter-layers. It is floristically subtropical in the forest rather than temperate according to a further analysis of distributions on Chinese endemic species. In the semi-humid evergreen broad-leaved forest zones there are four types of common deciduous broad-leaved forests. They are Alnus nepalensis forest, Juglans sigillata forest, Populus bonatii forest and Leucosceptrum canum forest respectively. They are secondary forests after the original vegetation was destroied. It is necessary to protect the secondary forests because we do not know what stages they are belonging to in ecological succession. It may be an ideal places for studying the secondary succession and restoration ecology. The semi-humid evergreen broad-leaved forests of Mts. Wuliangshan are of obvious significance in biodiversity conservation because of its important characters and the location harbpring many endemic and endangered taxa.