四川省黄龙自然保护区种子植物区系研究

A Floristic Study of the Seed Plants on Huanglong Nature Reserve in Sichuan Province

在对四川省黄龙自然保护区初步调查的基础上 ,对其种子植物科、属、种分布区类型进行了统计和分析。结果表明 :(1)区内有种子植物 74科 ,2 0 8属 ,474种 ;(2 )植物区系优势科、属明显。含 2 0种以上的优势科数虽只占总科数的 8.7%,但其所含属数和种数却分别占总属数和总种数的 38.94%和 44 .0 9%;含 5种以上的 2 6个优势属所含的种数占区内总种数的 37.34 %,这些科、属在本区系组成中占明显的主导地位 ;(3)在科、属、种 3个层次上 ,植物区系均表现出明显温带性质。尤其在属级水平上 ,温带分布占总属数的 82 .89%,其中北温带分布占总属数的49.73%,表现出明显温带性质 ,并以北温带成分为主 ;(4 )中国特有种丰富 ,达 314种 ,占区内总种数的 6 6 .39%;(5 )植物区系起源古老 ,地理成分复杂 ;(6 )本植物区系与西南西北地区 ,特别是云南地区联系紧密。

The Huanglong Nature Reserve is a provincial reserve,which is located in northwest of Sichuan Province.From the statistics and analysis of the areal-types of family,genus and specie basing primary survey of the Huanglong Nature Reserve,the results indicate as follow:(1) There are 474 species in 208 genera and 74 families of seed plants in the Nature Reserve.(2) The dominant families and genera are prominent.These families containing more 20 species only account for 8.7% of overall families,but genera in which account for 38.94% of overall genera and species account for 40.09% of overall species.The 26 dominant genera containing more 5 species account for 37.34% of overall species.take up dominant degree.(3) The flora of seed plants in the region shows distinctly the characteristic of Temperate in the level of family,genus and specie.Especially in the level of genus,the genus of Temperate account for 82.89% of overall genus,and the genus of North Temperate account for 49.73% of overall genus,so the characteristic of Temperate is distinct,and the elements of North Temperate account for huge proportion.(4) Chinese endemic species of seed plants in Huanglong Nature Reserve are abundant.(5) The flora are ancient origin and very complex in geographical elements.(6) The flora of seed plants in the region relates the flora of Southwest and Northwest of China tightly,especially the flora of Yunnan.