竹叶兰的地理分布及气候影响因子

Geographical Distribution and Climatic Limiting Factors of Arundina Graminifolia

为全面了解竹叶兰当前地理分布现状及气候限制性因子,基于142个地理分布记录和相应的19个生物气候数据,利用主成分分析法对竹叶兰的地理分布格局及其主导环境因子进行分析。结果显示:竹叶兰在中国的水平分布以中亚热带以南为主,同时东部地区的分布要比西部集中;垂直分布累计显示,竹叶兰以中低海拔分布为主,多数在海拔800m以下生长;主成分分析的结果显示,降水对竹叶兰地理分布格局的影响要强于温度,尤其是干季降水的影响较大,降水和温度分别是限制竹叶兰向西和向北分布扩散的主要气候因子。

In order to comprehensively understand the current geographical distribution status and climatic limiting factors of Arundina graminifolia,the geographical distribution pattern of A.graminifolia and its dominant environmental factors are analysed using principal component analysis(PCA)based on 142 geographical distribution records and the corresponding 19 bioclimatic data.The results show that the horizontal distribution of A.graminifolia is mainly south of the central subtropics in China.However,the distribution pattern is more concentrated in the east than that in the west.The cumulative vertical distribution shows that A.graminifolia is mainly distributed at middle and low altitudes,especially below 800 m.The results of the principal component analysis show that precipitation has a slightly stronger influence on the geographical distribution pattern of A.graminifolia than temperature,especially the dry season precipitation.Precipitation and temperature are the main climatic factors limiting the westward and northward distribution of A.graminifolia respectively.