山西省种子植物多样性分布格局与环境关系的研究

Analysis of relationships between species richness and distribution pattern of spermatophyte in Shanxi Province

采用除趋势对应分析 (DCA)、典范对应分析 (CCA)对山西省 1 2个区域的种子植物多样性及区系地理成分的分析表明 ,全省种子植物多样性格局可分为 3类 :第 1类为山西省西部和北部山地 ,热量相对较低 ,海拔较高 ,降水随海拔升高而增加 ,气候垂直变化明显 ,小生境类型较多 ,分类强度大 ,区系成分中以北温带、旧世界温带属占绝对优势。第 2类为山西中部地区 ,地势相对较低 ,水热条件中等 ,北温带成分仍为优势种 ,但旧世界温带分布属和泛热带分布属的比例增加。第 3类为山西南部和东南部山区 ,降水量相对较高 ,但温度也高 ,蒸发量大 ,属的区系成分中以北温带成分为优势 ,但第二优势成分为泛热带亚洲成分 ,与前 2类地区相比 。

The Detrended Correspondence Analysis (DCA) and Canonical Correspondence Analysis (CCA) have been adopted to detect the relationships among 20 environmental factors, as well as the effects of environmental factors for the plant diversity and geographical components of Genus of 12 areas in Shanxi province. The results reveal that 12 areas may be clustered into 3 types. The first type is mountain areas in the east and west region of Shanxi province, where the elevation is relatively high, and the heterogeneity of habits is strong. The absolute dominant geographical component of genus is North temperate flora. The second type is in the central part plateau and the basin, where the elevation is relatively low, and the conditions intensity of water and temperature is medium, the dominant geographical components of genus is also North temperate flora, but the rate of old world temperate flora and Pan tropic flora is increased. The third type is in the mountain region of south and southeast in Shanxi, where the temperature is relatively high, the dominant geographical components of genus is North temperate flora, but the second dominant components is Trop Asia flora, comparing with the above tow types, the rate of tropic components is increased obviously.