贺兰山油松和青海云杉交错区的物种丰富度研究  

Study on species richness in ecotone between Pinus tabulaeformis and Picea crassifolia on Helan Mountain

作　　者：朱源[1] 康慕谊[1] 刘全儒[2] 江源[1] 和克俭[3] 

机构地区：[1]北京师范大学资源学院中国生态资产评估研究中心地表过程与资源生态国家重点实验室,北京100875 [2]北京师范大学生命科学学院,北京100875 [3]云南大学资源环境与地球科学学院,云南昆明650091

出　　处：《植物资源与环境学报》2007年第3期1-6,共6页Journal of Plant Resources and Environment

基　　金：国家自然科学基金资助项目(40571001和40671065)

摘　　要：对贺兰山东坡的油松（Pinus tabulaeformis Carr．）和青海云杉（Picea crassifolia Kom．）交错区进行了野外群落调查和数据分析。结果表明，该交错区跨越2100～2500ITI海拔范围，油松林和青海云杉林的海拔分界线为2300～2350m。地形是该交错区群落物种丰富度的主要影响因子，阳坡群落的物种丰富度高于阴坡。中等坡度样地的物种丰富度较低；平缓或陡峭样地的物种丰富度较高。海拔升高，物种的丰富度也有所增加。当群落中油松和青海云杉的优势度基本相等时，为典型的油松与青海云杉交错区，在该交错区内，随着油松优势度的降低和青海云杉优势度的升高，土壤条件有所改善，物种丰富度增加。The field survey and datum analysis of ecotone between Pinus tabulaeformis Carr. and Picea crassifolia Kom. were carried out on the east side of Helan Mountain. The results showed that altitude range of this ecotone was 2 100 - 2 500 m, and altitude boundary between Pinus tabulaeformis and Picea crassifolia forest belts was 2 300 -2 ）50 m. The species richness in ecotone was significantly influenced by topographic factors, including aspect, slope and altitude. The species richness of south-faced plots was higher than that of north-faced plots. Compared to those plots on flat or steep places, the species richness of plots with middle slopes was lower. Ascending with altitude, the species richness was tending to increase. In the typical ecotone, where the dominance of Pinus tabulaeformis and Picea crassifolia was almost same, which along with gradually replacing of dominance of Pinus tabulaeformis by Picea crassifolia, the conditions of soil were improved and the species richness was increased.

关 键 词：群落交错区 物种丰富度 地形因子 油松 青海云杉 

分 类 号：Q948.158[生物学—植物学]