鄂西南泽泻科植物的分布

在鄂西南,泽泻科植物主要集中在利川、恩施、鹤峰和建始四县市,常见于沼泽和水田,多生在腐殖质丰富而略带酸性(pH<7)的土壤上。在垂直方向上,随海拔升高,该科植物种数增加;但分布量以低山最多,其次是高山。除少数广布种外,其余多数种类分布范围狭窄,对生境有特定选择,这与鄂西南沼泽和水田等生境的分布状况密切相关。鄂西南泽泻科植物主要属东亚亚热带温带分布,该科区系与江西、江苏和日本的同类区系关系十分密切。

THE GEOGRAPHICAL DISTRIBUTION OF ALISMATACEAE IN SOUTHWESTERN HUBEI1.

The species of Alismataceae are chiefly distributed in Lichuau-Enshi-Hefeng-Jianshi, often grow in mountainous swamps and paddy fields mostly with rich humus and acidulous soil (pH value usualy below 7). The species number tends to increase as the altitude increases, yet the distributional amount is the greatest below 800m alt. Although some species have wide distribution, yet most species of this family have very narrow distribution, having fairly strict selection for the habitats, and all these are correlated to the distribution of mountainous swamps and paddy fields.Mainly distributed in subtropical and temperate East Asia, the flora of Alismataceae in southwestern Hubei has a very close relationship With the same flora in Jiangxi, Jiangsu and Japan.