甘肃省太子山次生林区维管植物多样性调查研究

太子山林区处于青藏高原与黄土高原的过渡地带,由于特殊的地理位置,蕴育了较为丰富的植物资源。通过实地调查和区系统计分析表明:1)该区分布有维管植物 89 科 306 属 847 种 12 变种 2 变型;其中蕨类植物 9 科16 属 29 种,占总种数的 3.42 %;种子植物 80 科 290 属 818 种,占总种数的 96.56 %;2)温带分布属占本区属数的75.1 %,占本区总种数的 81.4 %,热带分布属占本区总属数的 8.53 %,表现出明显的温带性质和一定的区系过渡性;3)高位芽植物和地面芽植物占本区总种数的 87.9 %,具有绝对优势;4)植物区系组成与马衔山林区相似性最高,其次是莲花山、洮河流域,较远是孟达保护区;5.本区应划归横断山脉植物地区、川西北甘西南青东南小区,并作为横断山脉植物地区与华北植物地区、黄土高原亚地区的分区界线。

Studies on species diversity of vascular plants in the Taizi Mountains forest region

The forest region of the Taizi Mountains, locating in the transitional zone between Tibetan Plateau and Loess Plateau, is located in special geological area and shows obvious diversity in vascular plant species and forest community types. The results of floristic analysis based on inventory data showed as follows: 1.There were 89 families, 306 genera,847 species, and 12 varieties, 4 subspecies, 2 forms of vascular plants, among which pteridophyta included 9 families ,16 genera and 29 species, occupied 3.42 % of the total number of species and spermatophyte 80 families,290 genera,818 species, occupied 96.56 % of the total; 2. The temperate genera occupied 75.1 % of the total number of genus and 81.4 % of the total species, but the tropical genus occupied only 8.53 % and the flora expressed transitional characteristics; 3. The life forms of 719 species had been identified as phanerophytes (Ph) and chamaephytes (Ch), tended to be absolutely dominant life-forms and occupied 87.9 % of the total species; 4. The floristic composition was highly similar to the Maxian Mountains, and the follows were the Lianhua Mountains, the Tao River basin and the Mengda Nature Reserve; 5. The forest region should belong to the floristic subregion of the Northwestern Sichuan-Southwestern Gansu-Southeastern Qinghai of the Hengduan Mountains Floristic Region and could be regarded as the boundary line between this region and the Loess Plateau subregion of the Northern China Region.