徐州石质山地人工林物种多样性及群落稳定性

Species diversity and community stability of plantations in rocky mountain areas of Xuzhou

以徐州石质山地上发育的人工侧柏林和刺槐林为研究对象,在群落学调查的基础上,分析了人工林的物种多样性和群落稳定性,探讨了人工植被的动态特征和变化规律。结果表明:现有人工林的物种组成和结构发育存在较大差异,结构复杂的群落物种多样性高,刺槐林的群落总体多样性大于侧柏林;人工林优势种群的自我更新较弱,现有人工林均处于不稳定状态;现阶段人工林的变化主要反映在灌木和草本层;复杂的群落结构、丰富的物种多样性有利于群落的稳定,故可通过抚育间伐、补植和引入乡土树种等促进人工林的稳定发展。

In order to explore the dynamic characteristics and change mechanism of artificial vegetation in rocky areas, the 15 plots of Platycladus orientalis and Robinia pseudoacacia plantations located in bedrock hilly areas in Xuzhou were selected to study the species diversity and community stability of the plantations through the method of typical community surveys of the plots. The results revealed that there were great differences in the species composition and structure in the existed plantations and the species diversity was usually higher in the structure complex community. The community whole diversity in the R. pseudoacacia plantations was larger than that in the P. orientalis plantations. The existed plantations were unstable because of the weak regeneration of dominant population. However, the community stability in the R. pseudoacacia plantations was slightly higher than that in the P. orientalis plantations. Also, the community dynamics of the plantations appeared different markedly among layers, and the differences mostly appeared in shrub layer and herb layer. Therefore, the approaches such as thinning, replanting and introducing native tree species, etc. could be used to promote the stable development of existing plantations in the areas.