京郊侧柏刺槐混交林植物物种组成特征对林内景观美景度的影响

Effect of the Characters of Species Composition on Scenic Beauty of In-forest Landscape of Platycladus orientalis-Robinia pseudoacacia Plantation Forest in the Suburbs of Beijing

北京市郊区风景游憩林侧柏刺槐混交林研究表明,侧柏刺槐林中,林内景观美景度差异与乔木层树种数量呈非线性相关,无其他伴生树种的林内景观美景度最高,两种以上伴生树种其次,而一种伴生树种为最低;伴生树种以黄栌为好,蒙桑和栾树其次,油松最低;两个主要树种的比例基本以其中一种占优势时,其景观美景度值高,且以刺槐的比例高时,林内景观美景度值更大;其林下植被物种多样性指数与林内景观美景度标准化绝对值成正比关系,即林下物种Simpson多样性指数、Shannon多样性指数、均匀度指数越大,其林内景观美景度出现两极分化现象。

The scenic beauty of Platycladus orientalis-Robinia pseudoacacia plantation of scenic-recreational forest was studied in the suburbs of Beijing. The results showed that the scenic beauty ofhad a nonlinear relationship with the number of species in tree layer. And no other associated species in the plantation forest had the highest scenic beauty degree, two or more associated species secondly, Associated species to a minimum. Associated species to Cotinus coggygria as well, Morus mongolica and Koelreuteria paniculata secondly, Pinus tabulaeformis minimum. The two main species of proportion to one of the basic advantages, the scenic beauty of its landscape value was high, and with a high proportion of Robinia pseudoacacia L. the scenic beauty of in-forest landscape had greater degree. It＇s understory vegetation and species diversity index was directly proportional to the absolute value of scenic beauty standardization of in-forest landscape, that is, the greater simpson diversity index, Shannon diversity index and evenness index of understory species, the forest scenic beauty appearing for two polarization phenomenon.