摘要
采用野外调查的方法,研究了绥德地区28年生不同坡向人工油松林林木个体生长、植物种类、相似系数和林下物种多样性特征,以明确坡向对人工油松林生长和群落结构的影响。结果显示,(1)阴坡油松的胸径、树高、冠高和冠幅均显著大于阳坡;(2)阴坡与阳坡林下分别有植物21和19种,共有种11种。群落相似系数为55%,说明坡向对人工油松林林下物种组成影响较大。(3)阴坡物种丰富度指数、均匀度指数和多样性指数均表现为草本层>灌木层;而阳坡的Shannon-Wiener指数和Pielou指数(Jsw)则与阴坡相反,为灌木层>草本层;群落总体多样性表现为丰富度指数和多样性指数均是阴坡稍大于阳坡,而均匀度指数表现为阳坡稍大于阴坡。研究表明,绥德地区人工油松林的生长状况阴坡显著优于阳坡,但与陕北南部地区人工油松林相比,该地区人工油松林林木生长各项指标还是较低,群落结构配置不合理。
To assess the slope aspect impact on the growth and commumty structure of Pinus taoutaeformis and to provide some scientific basis for reasonable management, field investigations were conducted to study the growth of Pinus tabulaeforrnis, species composition, species diversity and similarity coefficient under different slopes in Suide. The results showed that stem diameter,height, crown height and crown width on the shady slope were significantly greater than on the sunny slope. There was 21 and 19 species on shady slope and on sunny slope, and the number of common species of the two slopes was 11. The community similarity coefficient was 55 % ,which illustrated slope aspect had great influence on species composition. Species richness, evenness index and diversity index of the herb layer were higher than that of the shrub layer on the shady slope. Shannon-wiener index and Pielou index（JSW） were shrub layer〉herb layer on the sunny slope. The community species richness and diversity index were shady slope〉sunny slope; evenness index was sunny slope〉 shady slope. Research shows that the growth of tree on the shady slope were greater than on the sunny slope in Suide,but the growth indices were lower than that in the south region of Northern Shaanxi. Allocation of shrub and herd were irrational.
出处
《西北植物学报》
CAS
CSCD
北大核心
2009年第8期1678-1683,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
中国科学院西部行动计划(KZCX2-XB2-05)
国家十一五科技支撑课题(2006BAD09B03)
关键词
油松
坡向
生长状况
物种多样性
Pinus tabulaeformis
slope aspect
growth
species diversity
