阿拉善荒漠区种子植物科的初步分析

Study on the Seed Plants of Allah Desert

阿拉善荒漠区分布有种子植物73科,328属,820种,优势现象明显,优势科8个:菊科、禾本科、豆科、藜科、毛茛科、蔷薇科、十字花科和莎草科;表征科8个:香蒲科、麻黄科、柽柳科、蒺藜科、胡颓子科、藜科、眼子菜科和蓼科。植物区系成分多样,其中,以世界广布成分为主,共35科,占总科数的47.95%,它们对当地的生态环境具有重要的决定地位;其次为温带分布,共27科,占总科数的36.97%;热带成分、热带亚热带成分和泛热带成分较少,共11科,占总科数的15.07%。这些均反映出植物的分布与气候相适应的特点。

There are 73 families, 328 genera, 820 species seed plants which are obvious dominant phenomenon in Allah Desert of China. There are 8 dominant families （Compositae,Gramineae Leguminosae,Chenopodiaeeae, Ranunculaceae,Rosaeeae,Crueiferae,Cyperaceae）and 8 typical families（Typhaceae,Ephedraceae,Tamaricaceac, Zygophyllaceae,Elaeagnaeeae,Chenopodiaceae,Polyg-onaeeae,Potamogetonaeeae）. The flora has a diverse geographical elements and the mainly ones is cosmopolitan elements （35 families）,they are accounting for 47.95%, they play a important role on the local ecological environment.The followed is temperate elements （27 families）and they are accounting for 36.97%, Tropics,Tropics-Subtropics and exudes tropics elements are only 11 families and accounting for 15.07%.It shows that the distribution of plants adapt to the climate.