坝上高原与冀北山地过渡带木本植物区系研究

以坝上高原与冀北山地过渡带木本植物为研究对象,研究了该区木本植物区系的组成特征,结果显示本区有木本植物53科117属411种(含种下等级),其中裸子植物4科8属22种,被子植物49科109属389种.大科与较大科构成本区区系属、种组成的主体,含2～4种的小型属和单种属构成其区系属组成的主体.该区区系中木本植物117属,分为14个分布区类型,其中北温带分布、东亚和北美洲间断分布、泛热带分布和东亚分布占有重要地位.其木本植物区系的主要特征是:木本植物种类相对丰富；具有显著的温带性质；起源古老且具有明显的过渡性；区域单属科丰富,体现了过渡带区系的复杂性.

A Study on the Woody Plants Flora in the Ecotone of Bashang Plateau and Jibei Mountains Region,Hebei Province

The research on the woody plants flora composition of Bashang plateau and Jibei mountains region shows that there are 411 species(including infraspecific taxa) of woody plants belonging to 117 genera and 53 families in the ecotone.Among them,22 species belonging to 8 genera and 4 families of gymnosperm and 389 species belonging to 109 genera and 49 families of angiosperm are recognized respectively.In the flora,the large families and the relatively large families constitute the principal part of genera and species,while the small genera containing 2～4 species and single species genera constitute the principal part of genera.One hundred and seventeen genera of woody plants in the ecotone can be divided into 14 geographical patterns.Among them,North temperate,E.Asia & N.Amer.Disjunction,Pantropic and E.Asia are important patterns.Based on the research and discussion,the major characteristics of the flora can be concluded:species are comparatively rich,the genera of temperate are dominant,the flora is ancient origin with apparently transitivity,single genus families are rich,which shows the complexity of the flora in the ecotone.