仙居县古树的分布区类型及物种多样性

Distribution-type and Species Diversity of Ancient Trees in Xianju County

收集以往资料,采用实地调查方式,于2017年对仙居县的古树进行全面调查,并对古树的分布区类型和物种多样性进行分析。结果表明,仙居县有古树4 880株,共34科69属98种。古树植物区系的地理成分较为多样,但是具有明显的温带性质,热带分布类型也较丰富,呈现热带向温带过渡的特征,与仙居的地理位置和亚热带季风气候条件相吻合。古树物种的种数、古树株数、物种多样性指数和均匀度指数在县域内的分布均为南北两侧高、中间低,与仙居县南北两侧山系自东向西延伸的地形地貌特征存在一定联系。

Collecting previous data and using the field survey method,the ancient trees in Xianju County were surveyed comprehensively in2017,the distribution-type and the species diversity of ancient tree were analyzed.The results showed that there were4880ancient trees in Xianju County,belonging to34families,69genera and98species.The geographical composition of the ancient tree flora was relatively diverse,the flora showed the obvious temperate characteristic and rich tropical elements,with transitional characteristics from tropical to temperate,which was consistent with Xianju’s geographical location and subtropical monsoon climate conditions.The number of ancient trees and species,species diversity index and evenness index in ancient tree species were high in north-south sides and low in the middle.It was related to the topographic and geomorphologic features of the mountain system extending from east to west on the north and south sides of Xianju County.