四川盆地道路沿线岩石坡面植被演替不同阶段群落动态特征分析

Plant Community Dynamics of Vegetation Succession Stages on Roadside Rock Steep Slope in Sichuan Basin,China

通过野外样方调查,结合样方内优势物种生活型建立道路高陡边坡植被演替序列,分析不同序列内植物群落盖度和演替度动态特征,并采用Kruskal-Wallis和Mann-Whitney判断不同序列是否存在差异,结果表明:1)植物群落盖度和演替度随植被演替序列逐渐增加,一年生草本植物群落阶段(黄鹌菜+野菊花Youngia japonica+Dendranthema indicum)群落盖度和演替度均最小,分别为46%和22.4,而乔木植物群落阶段(响叶杨+柿树Populus adenopoda+Diospyros kaki)群落盖度和演替度均达到最大,分别为86%和535.7;2)不同序列内植物群落盖度和演替度经Kruskal-Wallis检验差异显著(P=0.006和P=0.001);Mann-Whitney检验结果显示,一年生草本植物群落盖度与其余序列群落盖度差异极显著(P<0.005);演替度Mann-Whitney检验结果显示,一年生草本植物群落与草灌植物群落差异显著(P=0.049),灌木植物群落、乔木植物群落与其余阶段演替度差异极显著水平(P<0.003).研究结果表明道路坡面植被演替不同阶段群落盖度、群落演替度逐渐增加的动态特征,可为相似生境下生态恢复和重建提供重要指导意义.

Based on field sampling and the lifeform of the dominant species,the vegetation succession stages were determined; the community coverage and community succession degree were testified for the significance in successional stages by non-parametric test Kruskal-Wallis and Mann-Whitney. The results show that： 1） The community coverage and community succession degree on roadside rock steep slope were both increased gradually as the vegetation succession went forward. The minimum community coverage and community succession degree were 46% and 22. 4,respectively in annual herb stage（ Youngia japonica ＋ Dendranthema indicum）; the maximum were 86% and 535. 7,respectively in arbor community stage（ Populus adenopoda ＋ Diospyros kaki）; 2） The non-parametric test Kruskal-Wallis and Mann-Whitney showed that community coverage and community succession degree were significantly different at the different stage of the vegetation succession（ P = 0. 006 and P = 0. 001）; Furthermore,Mann-Whitney nonparametric test results of community coverage showed that the dicto herb community was significantly different from other communities（ P〈0. 005）; the community succession degree of dicto herb community was obviously different to mixed grass / shrub community（ P = 0. 049）. Shrub and tree communities were significantly different with other three communities（ P〈0. 003）. The dynamics of community coverage and community succession index on roadside rock steep slope supported the useful instruction on ecological restoration and reconstruction.