嵩山侧柏(Platycladus orientalis)人工林恢复过程中物种多样性变化研究

采用空间代替时间的方法,通过样方调查对嵩山侧柏人工林恢复过程中不同群落的物种多样性变化进行了研究.结果表明,在侧柏人工林恢复过程中,灌木层和草本层的物种丰富度和多样性变化规律相似,物种丰富度(Margalef指数)和物种多样性(Shannon-Wiener指数及Simpson指数)都表现为“低→高→低→高”的变化趋势,在波动中逐渐增加;物种均匀度(Pielou指数)却没有明显的增加趋势.不同恢复阶段因人工林环境条件的改变导致林下不断出现因喜阳和耐荫物种的交替而出现的物种消亡和更新,个体数目分布的不均使物种均匀度显示出较大的波动性.总体来看,侧柏人工林在恢复过程中是朝着有利于物种多样性恢复的方向发展.

Study on Species Diversity in Artificial Restoration Process of Platycladus Orientalis Forest, Songshan Mountains

By adopting plot investigation and the concept of space as a substitude for time,the developments of species diverstity of the P.orientalis forest at different restoration stages were studied.The results indicated that the species richness and diversity in different successional series of the P.orientalis plantations were gradually increased with a fluctuating way in the storation process.The indices of species richness(Margalef index) and species diversity(Shannon-Wiener index and Simpson index) of shrubs and herbage layers all exhibited a low-high-low-high tendency with some slight fluctuations in the early stages(from plantation establishment to 21 years old).However,the richness index showed no rising intend but with slight decreasing tendency,which indicated that the disappearance and regeneration of some shade tolerant species and intolerant species occurred with the alteration of the environmental conditions of plantations in different restoration stages.As a whole,the storation process of the P.orientalis plantations showed a tendency of development that in favor of resuming species diversity.