喀斯特森林自然恢复演替中林木对生境利用分析

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。

Analysis of Forest Inhabited Microhabitats in Succession of Natural Restoration of Karst Forest

Based on microhabitats and vegetation in karst,the distributing area of microhabitats and forest is analyzed in actual situation.There are different area rates of microhabitats as follows,stony surface>soil surface>stony gully>stony crevice>stony pit>stony cave.With the vegetation succession,the density of trees increases from herbaceous stage to scrub-shrub stage,the density of trees is consistent from shrub-tree stage and the density of trees declines in climax tree stage.Trees are mainly growing in stony crevice and soil surface in the early period of forest restoration.With the development of forest succession,plants can make the best use of all the microhabitats.As a result,the restrictive effects of microhabitats are gradually reduced,the microclimatic change in forest is mainly the restricting condition in the later period of vegetation succession.