| 摘要: |
| 通过野外数据采集和资料整理分析，以年楚河流域种子植物为研究对象，对区域种子植物科、属组成、区系特征和资源型进行分析。年楚河流域共记录到种子植物58科179属339种；生活型以多年生草本为主；资源类型中药用植物最多。科内种水平上大型科为优势科，有菊科（Asteraceae）、禾本科（Poaceae）、豆科（Fabaceae）；科内属的数量水平上，大型科、较大型科和小型科是植物科组成的主要成分。科的分布区类型中除世界广布型外，以温带性质为主导，热带性质次之。属的组成以单种属和小型属为主，其分布区类型表现出明显的温带性质；科、属的特有性不高。与邻近区域的植物区系R/T值比较中，本研究区与拉萨河流域、佩枯错地区植物区系的性质较接近；比较这两个区域与研究区域植物属、种的相似性系数，发现拉萨河流域与研究区域植物属、种的相似性均高于佩枯错，本研究区植物区系与拉萨河流域的亲缘关系更为亲近。 |
| 关键词: 年楚河 区系地理 R/T值 Sorensen系数 |
| DOI：10.14188/j.ajsh.2021.05.010 |
| 分类号:Q948 |
| 基金项目:2019年中央支持地方高校改革发展资金（藏财预指［2019］1号）；2020年中央支持地方高校改革发展资金生态学“黄大年式教师团队”建设项目（藏财预指［2020］1号）；西藏大学高水平人才培养项目（2019-GSP-S053） |
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| Composition and floristic characteristics of seed plants in the Nianchu River Basin， Tibet |
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WEN Xiaodi, CHEN Jingjing, Phurbu Tsering, Dawa Zhuoma, Basang Phuntsok, Lhaduo
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Alpine Botany Laboratory， School of Science， Tibet University， Lhasa 850000， Tibet， China
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| Abstract: |
| The composition， floristic characteristics and resource types of seed plants in the Nianchu River Basin were analyzed through field investigation and literature analysis. A total of 339 species of seed plants belonging to 179 genera and 58 families have been recorded in the Nianchu River Basin. Perennial herbs are the dominant life forms， and the medicinal plants are the main resource type of seed plants in the study area. In terms of the number of species within the family， large families are dominant families including Asteraceae， Poaceae and Fabaceae. However， the large， larger and small families are the main components of plant families in terms of the number of genera within the family. In addition to the world-wide type， the distribution area of the family is dominated by temperate character followed by tropical character. The composition of the genus is dominated by single-species genera and small genera， and its distribution area type shows an obvious temperate character with low number of endemic families and genera. The comparison of R/T value between the flora in the study area and in neighboring areas shows that the character of the flora in the study area is close to that of the Lhasa River Basin and Peikucuo area. The flora in the study area is more closely related to the Lhasa River Basin. |
| Key words: Nianchu River floristic geography R/T value Sorensen coefficient |
