昆仑山地区禾本科植物的区系特点

昆仑山地区位于我国西部,东经74°—96°,北纬33°—40℃,是青藏高原西北隅及北部边缘的高山高原区。本区禾本科植物有49属163种。分析表明:①本区的北温带成份占有绝对优势的地位,具有明显的北温带性质。②本区所分布的泛热带成份实属一类具有一定程度的温带性质的泛热带分布类型,一些种类还表明了本区同地中海地区植物区系的历史渊源。③本区的禾本科植物绝大多数属于温寒地带分布类型,因而具有明显的高原高山植物区系的特征。④本区无特有属,特有种亦较少。说明本区系是一个年青的、衍生的区系。⑤本区同周围区系的联系广泛,同西藏区系的关系最为密切。

The Floristic Characteristics of the Family Poaceae from Kunlun Area

Kunlun area is situated at the westernmost of China,the square between latitude 33 degrees to 40 degrees of north and longitude 74 degrees to 96 degrees of east. It belongs to the alpine and highland region. Extending to the northwesternmost and northern fringe of Qinghai-Xizang (Tibet) Plateau. The family of poaceae contains 49 genus and 163 species in Kunlun area. Analysis of the distribution on the genera and species from poaceae in Kunlun area indicated: 1. The poaceae flora is chiefly north temperate elements and also rich old world temperate elements and other temperate elements. So it's clear that the floristic nature of poaceae in Kunlun area belongs to north temperate. 2. The dispersed regions of pantropic genera in this area are all part o the pantropic type that have a certain degree of temperate nature,and it's show the historical origins on Mediterranean with this area. 3. Great majority of grasses in this area is a dispersed type to temperate and cold zone. Showing the feature of highland and alpine flora is quite clear. 4. Without endemic genera of poaceae in Kunlun area. Poor endemic species. From the angle in poaceae show that the flora is a young and evolved flora. 5. The flora of Kunlun area is closely related to the flora of Xizang (Tibet), and connects extensively to around areas.