甘肃省早熟禾属植物区系特征分析  

Analysis of the Floristic Characteristics of Poa in Gansu Province

作　　者：黄晓 杨艳丽 吴晓凡 方强恩[1] HUANG Xiao;YANG Yanli;WU Xiaofan;FANG Qiangen(College of Pratacultural Science,Gansu Agricultural University/Key Laboratory of Grassland Ecosystem,Ministry of Education/Pratacultural Engineering Laboratory of Gansu Province/Sino-U.S.Center for Grazingland Ecosystem Sustainability,Lanzhou 730070,China)

机构地区：[1]甘肃农业大学草业学院/草业生态系统教育部重点实验室/甘肃省草业工程实验室/中-美草地畜牧业可持续发展研究中心,甘肃兰州730070

出　　处：《中国草地学报》2024年第9期139-148,共10页Chinese Journal of Grassland

基　　金：甘肃省林草局草原生态修复治理科技支撑项目(GSLC-2020-3,LCJ20210021)。

摘　　要：明确甘肃省早熟禾属植物区系特征及分布格局,可为开发和利用早熟禾属植物资源提供依据。本研究通过整理馆藏标本,查阅文献资料,建立了甘肃省早熟禾属植物名录,并从物种组成、地理分布、区系成分、区系分化等方面进行甘肃省早熟禾属植物区系特征及分布格局的分析。结果表明,甘肃省早熟禾属植物共43种(包含3变种、8亚种);从水平分布看,祁连山北麓地区和甘南高原地区早熟禾属物种数最多,中部黄土高原区分布物种数最少;从垂直分布看,早熟禾属主要分布在2000~<4000 m亚高海拔区,其中2500~<3000 m段物种最为丰富;甘肃省早熟禾属植物区系划分为7个分布型和10个变型,主要以东亚分布为主;甘肃省早熟禾属植物区系与邻省区系均有较高相似性,相似系数达50.00%~74.73%,与青海省相似性最高;甘肃省早熟禾属植物区系分化强度与物种的分布格局一致,区系分化强度最高的是祁连山北麓地区和甘南高原地区。总体上,甘肃省早熟禾属植物主要分布于冷凉湿润的亚高海拔区,祁连山北麓地区和甘南高原地区是甘肃省早熟禾属植物分布的多度中心,温带属性、区域特有性低、交汇和过渡性是甘肃省早熟禾属植物区系的基本特征。Clarifying the floristic characteristics and distribution patterns of Poa plants in Gansu province can provide a basis for the development and utilization of Poa plant resources.In this study,a list of Poa plants in Gansu province was established by collecting specimens and consulting literature.The floristic characteristics and distribution patterns of Poa plants in Gansu province were analyzed from the aspects of species composition,geographical distribution,floristic composition and floristic differentiation.The results showed that there are 43 species(including 3 varieties and 8 subspecies)of Poa in Gansu province.From the perspective of horizontal distribution,the number of species in the north foot of Qilian mountains and Gannan plateau was the highest,while the number of species in the central Loess Plateau was the low‐est.From the vertical distribution,the species were mainly distributed in the sub-alpine altitude area of 2000-<4000 meters,and the species were most abundant in the 2500-<3000 meters section.The Poa flora in Gansu province could be divided into 7 distribution types and 10 variants,mainly in East Asia.The Poa flora in Gansu province had high similarity with those in neighboring provinces,with the similarity coefficient of 50.00%to 74.73%,and the highest similarity with Qinghai province.The floristic differentiation intensity was consistent with the species distribution pattern,and the highest intensity observed in the northern foothills of Qilian mountains and Gannan plateau.In general,Poa plants in Gansu province were primarily distributed in cool and humid sub-alpine regions,and the northern foothills of Qilian mountains and the Gannan plateau were the abundance centers of Poa plants in Gansu province.Temperate attributes,low regional endemism,intersection and transition were the basic characteristics of Poa flora in Gansu province.

关 键 词：甘肃省 早熟禾属 植物区系 区系分化 

分 类 号：Q948.5[生物学—植物学]