采用时空互代方法,对兴隆山山杨-白桦-青？e林及辽东栎演替不同阶段优势乔木种群组成、径级与高度级结构,以及林分和优势树种密度变化规律进行了研究。结果表明:①随着森林正向演替的进行,阳性树种山杨、白桦等的重要值在减小,并逐渐退出森林群落; 阴性树种青？e重要值在增加,并逐渐演变成优势树种和建群树种。②胸径与树高呈逐渐增加的趋势,处于不同演替阶段的森林群落及不同优势树种径级与高度级分布表现多样而复杂。③林分和青？e密度先增加后减小,山杨和白桦密度一直在减小。④林分和青？e死亡株数先增加后减小,山杨和白桦死亡株数一直在减小; 青？e幼苗及幼树密度先增加后减小。研究认为,兴隆山山杨-白桦-青？e林正逐渐向青？e纯林方向演替。To explore the structure characteristics of dominant tree species population during forest succession process of Xinglong Mountain and provide a scientific basis for the close-to-nature management of natural secondary forest and artificial pure forest in this region, by using the methods of spatial series representing temporal series, the dynamic law on composition, DBH and height class distribution of dominant tree species, and density of stand & dominant tree species about Populus davidiana-Betula platyphylla-Picea wilosonii forest during different secondary succession stages in Xinglong mountain were studied. The results showed that:① With positive succession of forest community, the important values of positive species, such as P. davidiana and B.platyphylla were gradually decreasing, and these species were withdrawing from the forest community gradually; however, the important value of negative species P. wilosonii was increasing, and it would be the dominant tree species and constructive species.② DBH and tree height showed a trend of increasing; and the class distributions of DBH and height about forest community and dominant tree species were various and complex in different succession stages. ③ The densities of stand and P. wilosonii increased in early stage but decreased in latter period,whereas the densities of P. davidiana and B. platyphylla were gradually decreasing. ④ The mortality numbers of stand and P. wilosonii increased in early stage but decreased in latter period, whereas the numbers of P. davidiana and B. platyphylla were gradually decreasing; Numbers of seedings and saplings for P. wilosonii first increased then decreased.The research showed community of P. davidiana-B. platyphylla-P. wilosonii forest would gradually evolve to be pure P. wilosonii forest in Xinglong mountain
