山西翅果油树分布区种子植物区系分析

翅果油树是国家2级珍稀濒危保护植物,在山西分布于中条山的翼城、绛县和平陆,吕梁山南端的乡宁、河津和稷山,约当110°36'~111°56'E,34°52'~36°05'N。山西翅果油树分布区有种子植物905种,隶属于449属95科,其中裸子植物2科2属4种,被子植物93科447属901种(双子叶植物78科312属714种,单子叶植物15科135属191种)。山西翅果油树分布区种子植物属的区系成分类型多样,具有暖温带性质。突出特征是温带成分占优势和有相当比例的热带成分,前者共有276属,占总属数的68.66%(其中北温带成分138属,占总属数的为34.33%);热带成分共有106属,占总属数的26.38%,它们在植物区系和植被的组成中具有重要作用或指示意义。在山西翅果油树分布区种子植物种的区系成分中,中国特有种占绝对优势,达369种,占总种数的41.65%,它们是构成山西翅果油树分布区优势植被类型的建群种和优势种的主要成分,如油松、华山松、白皮松、橿子栎、翅果油树、黄刺玫、虎榛子、白刺花、连翘、蚂蚱腿子等。此外,还提出了翅果油树资源的可持续利用和保护对策。

ANALYSIS ON THE FLORA OF SEED PLANTS IN ELAEAGNUS MOLLIS AREAL, SHANXI PROVINCE

Elaeagnus mollis is an endemic to China, being one of the China protected two grade rare and endangered plants, and distributed mainly in hills and lower mountains in southern Shanxi. E. mollis areal is located in hills of the southern tip of Luliang Ranges and the middle and western of Zhongtiao Ranges in Shanxi, 110°36'~111°56' E, 34°52'~36°05' N, which is the transit from the basin of southern Shanxi to the hills surrounding the basin.There are 905 species of seed plants, belonging to 449 genera and 95 families in E. mollis areal, among which gymnosperms have 2 families, 2 genera and 4 species, and angiosperms have 93 families, 447 genera and 901 species. The angiosperms are composed of dicotyledon and monocotyledon, having 78 families, 312 genera and 714 species, and 15 families, 135 genera and 191 species, respectively.The flora of genera in E. mollis areal has some typical characteristics of warm temperate deciduous broad leave forest. Among them, temperate distribution elements have 276 genera and accounting for 68.66% and tropic distribution elements have 106 genera and accounting for 26.38% in the total(excluding cosmopolitan), respectively, and both them make significant dominant or have some indicating meaning for the floristic elements and vegetation. Moreover, among the floristic elements of species, endemic species to China have 369 species, accounting for 41.65% in the total species, and makes evidently dominant. They are the major elements of the edificatos and dominant species of dominant vegetation types, such as Pinus tabulaeformis, Pinus armandi, Pinus bungeana, Quercus baronii, E. mollis, Rosa xanthina, Ostryopsis davidiana, Sophora viciifolia, Forsythia suspensa, Myripnois dioica etc. Finally, the strategies for the sustainable utilizing and protection of E. mollis resource.