次生裸地植被恢复过程的植物群落特征

城市建设造成的次生裸地越来越严重,次生裸地的人工植被恢复是重建生态系统的重要途径,裸地植被多样性的变化是植被恢复的重要表现。以涪陵地区马鞍乡次生裸地为研究对象,通过不同年限的跟踪调查和多样性分析,研究了次生裸地人工植被恢复过程中群落多样性特征。结果表明,恢复1年的裸地植被群落物种数量是原生裸地植被的2倍,恢复效果较好。乔木类的重要值降低,而草本类重要值增加,其中禾本科的白羊草的成层效果最好,相对频度与密度最大,表现出了较好的适应性。通过适宜的多种恢复配植方式,可以加快植物群落的演替进程,保持较高的物种丰富度与多样性,但是在群落演替的早期,物种丰富度主要表现在草本层植物的替代与更新。

Community Characteristics of Planting Vegetations in Secondary Barren

The secondary barren caused by urban construction becomes increasingly severe,and its artificial vegetation restoration is an important means to reconstructing the ecosystem,the change of barren vegetation diversity reflects the vegetation restoration.With the secondary barren in Ma'an Town of Fuling as the study object,the community characteristics during the artificial restoration of secondary barren are studied through years of follow-up survey and diversity analysis.As indicated by the results,the species quantity of the barren vegetation community which has been restored for one year is double that of the original barren vegetation;the important value of arbor is decreasing,while that of herb is increasing,the layered effect of Bothriochloa ischaemum(L.)Keng in Gramineae is the best,its relative frequency and density are the largest,showing better adaptability.Through appropriate planting model,the plant community succession process is accelerated and more species and diversities are preserved,but in the early stage of community succession,species richness degree is largely expressed in herbal plants renewing and replacing.