Altitudinal Patterns of Seed Plants Floristic Composition and Their Climatic Explanation in Helan Mountain Nature Reserve, Ningx-ia Province
Based on floristics of seed plants from China and documented data , we explored the patterns of seed plants richness along an altitu-dinal gradient in Mountain Helan Nature Reserve, Ningxia Province, China.Regression analysis of species richness and climatic factors was carried out by SPSS software.The results indicated that the main component of seed plants was temperate elements (73.9%).The species richness of seed plants and its floristic composition showed a unimodal pattern along the altitude in Mountain Helan Nature Reserve , up to peak value at about 2 000 m, species richness was not significantly changed at high altitude region (above 2 600 m).Annual mean temperature and annual potential evapotranspiration was the variable to explain the altitudinal pattern of seed plants and temperate elements species richness.In addition to these two climatic factors, cosmopolitan was influenced by min temperature of coldest month and annual precipitation , and tropical elements was influenced by min temperature of coldest month, annual precipitation and precipitation of coldest quarter.
国家科技期刊平台
NSTL
万方数据
维普
