新疆鄯善种子植物物种多样性及区系分析

Analysis on the diversity of seed plant in Shanshan of Xinjiang

文中在形态分类学研究的基础上,对鄯善野生种子植物物种多样性与区系地理进行了分析。鄯善共有种子植物48科177属,296种2亚种1变种。科的组成中,就属水平而言,寡属科与多属科构成科结构的主体,所含属数占74.01%,而就种水平而言,则大科和寡种科为主体,所含种数占81.94%;属的组成中,单种属和寡种属构成属结构的主体,所含种数占88.63%。该区新疆特有种与中国新疆仅分布种占26.09%,比例较高。生活型以地面芽植物与一、二年生植物为主;生态型以旱生植物与中生植物占较大优势,占种数的77.92%,与其区系的温带干旱性质相吻合。属的分布区类型表明,该区系地理成分多样,有11个分布类型和10个变型,温带性质明显,约占72.3%,以北温带为主。

The diversity and flora of seed plant in Shanshan of Xinjiang were analyzed. About 48 families, 177 genera and 296 kinds of species, 2 kinds of subspecies and 1 kinds of variaties wild seed plants are distributed in Shanshan. The little genera family and more genara family occupy 74.01% of the total genera which are predominant on genera level. The big family and little species family occupy 81.94% on the species level in the composition of family ;one species genera and little species genera occupy 88.63% of the total species which composed the main part of the genera. The endemic species of Xinjiang and the species which only distributed in Xinjiang of China occupy 26.09% of the total species. The hemieryptophytes and annuals and biennials occupy 71.91% of the total species which composed the main life form; the aridisphytes and mesophytes occupy 77.92% of the total species which predominanted by the analysis of life form and ecotype, which is consistent with the temperate and desertis nature. According to the analysis of the areal - type of genera, the flora elements in Shanshan are diversiform, their geographical distribution can be classified into 11 types and 10 subtypes, the temperate elements occupy 72.3% of the total, especially the north -temperate elements, are dominant in the floristic composition.