Study on the Pattern and Influence of Species Richness of Seed Plants in Renhuai City,Guizhou Province
The diversity of seed plants in Renhuai City was analyzed based on field investigation and historical data.The differences of seed plant species richness and the effects of environmental factors on species richness were analyzed by setting up sample plots in different regions,different altitude gradients and different geomorphological types in Renhuai section of Chishui River.The results showed that,(1)The diversity of seed plants was high in Renhuai City,where existed 1119 species of seed plants belonging to 569 genera and 141 families,including 18 species of national key protected wild plants.(2)The seed plants in the upper reaches of the Renhuai section of Chishui River were richer than those in the middle and lower reaches;in terms of vertical distribution,the species of seed plants showed a trend of increasing with the increase of altitude,with the highest species richness at the altitude of 1 100 m to 1300 m.Among the three geomorphological types of normal landform,Danxia landform and karst landform,the species richness of normal landform was the highest.(3)The linear regression analysis of environmental factors and species number showed that the correlation coefficient between annual average temperature and species number was R=-0.19,P＜0.01,showing a negatively correlation.In words,the key factor affecting the species richness of seed plants in Renhuai City was annual average temperature.
万方数据
维普
