宁夏种子植物区系研究

宁夏有种子植物(不包括栽培植物)101科493属1415种(含种下等级),其中裸子植物3科7属11种,被子植物98科486属1404种,另外,具有中国特有属12个,宁夏土著特有种21个(含种下等级)。本文对宁夏种子植物区系的组成、地理成分、特点进行了分析,主要结论如下:种类相对贫乏;区系地理成分复杂,区系中温带成分占绝对优势地位,显示出该区系的温带性质,其中北温带成分是宁夏植物区系的核心;区系起源古老,但也有年轻成分;区系联系广泛,多种区系成分的汇集,即华北-蒙古-唐古特三个区系成分交汇、混杂和过渡;宁夏土著特有成分和珍稀濒危植物较少。

A FLORISTIC STUDY ON SEED PLANTS IN NINGXIA

There are 1415 species (including infraspecific taxon) of the seed plants belonging to 101families and 493 genera (exclude cultivated plants) in Ningxia municpality. Among them, there are 11 species belonging to 11 genera and 3 families are of gymnosperm and 1404 species belonging to 486 genera and 98 families are of angiosperm. In addition, there are 12 Chinese endemic genera and 21 Ningxia endemic species. Based on the analysis of compositions and the geographical elements and characteristics of the flora, the paper has discussed the major characteristics of the flora as follows: Species are comparatively poor; the geographical elements of the flora are comparatively complex, and the genera of temperate are the dominant areal types, among them, north temperate play the part of an important role in the flora; the flora is ancient origin, but has also younger elements; the flora has widely relate to other area, and the flora is the crisscrossing and assembling of diversified geographical elements, or the crisscrossing and assembling, mixing and transition of North China, Neimenggu and Tanggute three floristic elements; the Ningxia endemic taxa and rare and endangered seed plants are comparatively low.