The relationships among the elevation, soil factors and structure of Caragana leucophloea community in Hami region were studied based on the investigation and measuring of filed vegetation. Seventy species of plants were observed in the communities of Caragana leucophloea, and they belonged to 18 families and 54 genera. These communities were mainly composed of the xerophytic plants of Chenopodiaceae, Gramineae and Compositae. The important value of Caragana leucophloea shrubs was the highest, successively Ceratoides latens and Calligonum mongolicum. The important value of perennial herbaceous plants was greater than that of annuals herbaceous ones. There were larger differences between different diversity indexes of sampling quadrats, then these diversity indexes had a significant positive correlation between each other, and they showed the single-peak distribution pattern along with the elevations for the communities. Using clustering analysis, the communities of Caragana leucophloea could be divided into four clusters;the diversity indexes of cluster Ⅰ and cluster Ⅱ were affected by soil available nitrogen and water content, respectively. The results could provide new information for researches of community ecology and references for regional vegetation restoration in Hami region.%对哈密地区典型白皮锦鸡儿群落进行了样方调查, 并分析群落结构与海拔、土壤因子的关系.研究结果显示,白皮锦鸡儿群落共出现植物70种, 分属18科54属, 以藜科、禾本科、菊科等干旱区的表征科居多, 区系以世界分布为主.灌木层以白皮锦鸡儿的重要值最高, 后依次为驼绒藜和沙拐枣;草本层中多年生草本重要值＞一年生草本.样方之间各项多样性指数差异较大, 但互相之间呈极显著正相关关系, 并随海拔上升都呈现单峰分布格局.运用聚类分析对群落进行分类, 研究区的白皮锦鸡儿群落被分为四个群丛, 并且群丛Ⅰ和群丛Ⅱ多样性指数分别主要受速效氮、土壤含水率影响.研究结果为哈密地区群落生态研究提供新资料, 并为该地区植被恢复提供参考.
展开▼
