太白山攀援植物物种丰富度及其沿海拔梯度的分布格局

物种丰富度的海拔梯度格局一直是生态学研究的热点内容。在森林生态系统中攀援植物是一个重要组成部分，秦岭太白山是一个具有代表性的地区，其攀援植物种类丰富且海拔梯度变化明显，但有关攀援植物丰富度的海拔梯度格局鲜有研究。通过收集《太白山自然保护区生物多样性研究与管理》和《秦岭植物志》记录数据，统计分析太白山攀援植物的物种丰富度，并研究比较不同生活型和攀援方式攀援植物物种丰富度沿海拔梯度的变化模式。结果表明:1）秦岭太白山包含攀援植物26科44属103种。其中，草质攀援植物共计15科23属44种，木质攀援植物共计17科25属49种；2）秦岭太白山攀援植物包括4种攀援方式:缠绕、卷须、蔓生和吸附。草质攀援植物种数，缠绕类＞卷须类≥蔓生类；木质攀援植物种数，缠绕类＞卷须类＞吸附类＞蔓生类；3）在科、属、种3个水平上，总攀援植物、草质攀援植物和木质攀援植物都随着海拔的升高呈现出明显的单峰分格局，且最大值都出现在1 200~1 400 m的海拔梯度。本研究结论对于深入理解秦岭太白山攀援植物多样性的影响因素以及开展该类群植物的保护利用有一定的参考价值。

Species Richness and Altitudinal Gradient Distribution Pattern of Climbing Plants in the Taibai Mountain

The altitudinal gradient pattern of species richness has been a hot topic in the field of ecology.Climbing plants are an important part of the forest ecosystem,and the Taibai Mountain is a representative region with a rich variety of climbing plants and a marked elevation gradient.However,few studies are reported on the altitudinal gradient distribution pattern of climber richness.Based on the data recorded in the books of “Flora Tsinlingensis” and “Biodiversity Research and Management of the Taibai Mountain”,this study analyzed the species richness of climbing plants in different life forms and climbing styles,and further analyzed and compared their change patterns along the altitudinal gradient by regression analysis.The results showed that 1) there are 103 species of climbing plants belonging to 44 genera and 26 families in the Taibai Mountain,in which 44 are vine species from 23 genera and 15 families and 49 are liana species from 25 genera and 17 families.2) Four climbing modes were found in the Taibai Mountain,including twining,tendril,sprawling and adhesive.In vine climbers,the richness was in the order of twining>tendril≥sprawling.In lians plants,twining>tendril>adhesive>sprawling.3) In families,genera and species levels,the total climbers,vines and lianas all presented obvious unimodal patterns with the elevation increase,and the maximum value appeared in the elevation gradient of 1 200-1 400 m.The results of this study will be helpful to understand the factors affecting the diversity of climbing plants in the Taibai Mountain and develop the conservation and utilization of climbing plants.