共和盆地不同人工灌木群落生态特性分析

摘要

There were four kinds of typical shrub plantations in alpine desert vegetation recovery areas of Gonghe basin:Caragana korshinskii, Hippophae rhamnoides, Salix psammophila and Salix cheilophila. To reveal the differences in species diversity of understory vegetation and environmental factors, we selected four kinds of artiifcial shrubberies with similar forest age located in the Gonghe basin, Qinghai Province and investigated species diversity and relevant environmental factors of community and herbaceous under forest. The results showed that:the impacts of plantation types on species diversity were obvious. species diversity index and species richness index of herbaceous under forest of each plantation type had a similar varying pattern, changing as Hippophae rhamnoides>Caragana intermedia >Salix psammophila >Salix cheilophila, while dominance index was on the contrary. Soil particle size composition of topsoil at different stands varied signiifcantly, but ifne sand had a larger proportion. Soil types of the plots are alkaline soil and the impacts of plantation types on soil nutrition content were obvious.%共和盆地高寒沙区植被恢复区4种典型人工灌木林是柠条Caragana korshinskii，沙棘Hippophae rhamnoides，沙柳Salix psammophila，乌柳Salix cheilophila。选取林龄相近的4种人工灌木林，对群落及林下草本植物的物种多样性和相关的环境因子进行调查，揭示林下植被物种多样性及环境因子的差异。结果表明：人工林类型对物种多样性的影响较为明显，各人工林类型林下草本植被物种多样性指数与物种丰富度指数具有相似的变化规律，均为沙棘＞柠条＞沙柳＞乌柳，而优势度指数与前者相反。不同林地表层土壤粒径组成差异明显，但细砂粒所占比例较大。试验样地均为碱性土壤，且林分类型对土壤养分含量影响显著。