论文部分内容阅读
以喀斯特区小生境及其地表着生植物作为研究对象,分析了喀斯特区小生境分布面积及不同小生境植物的分布现状。不同生境面积比例关系是石面>土面>石沟>石缝>石槽>石洞。在森林群落的自然恢复演替进程中,林木株数密度的变化是从草本群落阶段到灌丛灌木阶段逐渐上升,灌乔过渡阶段林木株数密度和灌木林阶段基本一致,演替到乔林阶段林木株数密度最大,到顶级群落阶段林木株数密度又出现下降。在森林群落恢复的早期,林木主要占据石缝和土面的小生境,随着演替的进行,对于石面这种严酷的小生境植物也能充分利用。植被在自然恢复演替的早期,喀斯特区小生境对植物的生长有一定的限制作用,随着演替的进行,生境的限制作用逐渐减弱,在森林群落演替的后期,林中小气候的变化成为植物演替的主要限制条件。
Taking the niche of karst area and its surface plant as the research object, the distribution of niche and distribution of niche in karst area were analyzed. The proportion of different habitats area ratio is stone surface> soil surface> stone ditch> stone seam> stone groove> stone cave. In the process of natural restoration and succession of forest community, the change of plant population density gradually increased from the herbaceous community stage to the shrub and shrub stage. The number density of shrubs in the transitional stage of shrubs was basically the same as that of the shrubbery stage, The number of trees was the highest, and the number of trees in the top community stage declined again. In the early period of restoration of forest communities, the forest trees mainly occupied the niches of stone seams and soil surface. As the succession proceeded, the harsh niche plants such as stone surface were also fully utilized. In the early stage of natural succession, the niche of karst area restricted the plant growth. With the succession of habitat, the habitat restriction gradually weakened. In the later stage of forest community succession, the change of forest microclimate Become the main limiting factor of plant succession.