【摘要】 以广西平果县喀斯特石漠化地区7种主要人工植被恢复模式为研究对象,采用主成分分析、相关性分析和敏感性分析方法,对涵盖林分生长、凋落物和土壤3类23个参数进行分析,选取对质量变异敏感、能最大限度代表所有候选参数的最小数据集,应用熵权灰色关联分析法对其植被恢复效应进行定量分析与评价。结果表明:1)研究区植被恢复效应评价最小数据集由胸径、最大拦蓄量、土壤自然含水量、全氮、速效磷和速效钾等6个参数组成。2)植被恢复效应加权关联度由大至小依次为银合欢0.795>任豆0.631>柚木0.583>香樟0.541>顶果木0.433>乌墨0.391>苏木0.381。3)不同模式植被恢复效应存在一定差异,银合欢属Ⅰ级(优),任豆属Ⅱ级(良),柚木和香樟属Ⅲ级(中),顶果木、乌墨和苏木属Ⅳ级(差)。4)银合欢和任豆属固氮类先锋树种占据着演替早期生态位,更能适应演替早期的环境,在生理特征上有明显优势。5)在喀斯特石漠化地区植被恢复初期筛选配置适生先锋树种,率先恢复植物群落的基本结构和功能,有利于演替后续优势物种的入侵和定居,加快植被恢复演替进程。6)实例验证了基于熵权灰色关联分析法用于植被恢复效应评价的可行性,为植被恢复效应定量化评价提供了新的方法,具有一定的实用价值和推广意义。更多还原

【Abstract】 To assess the effect of vegetation restoration of karst rocky desertification in Pingguo County, Guangxi, China, seven primary vegetation restoration models there were surveyed. Three kinds of factors such as stand growth, litters and soil(including 23 parameters)were analyzed, and then the minimum data set that is sensitive to mass variation and can maximally represent all candidate parameters was selected. Finally, entropy weighted grey relational analysis was applied to quantitatively analyze and evaluate the effect of vegetation restoration. The results are as follows. 1) The minimum data set was composed of diameter at breast height, maximum interception amount of litter, soil natural water content, total nitrogen, available phosphorus, and available potassium. 2) The weighted incidence degree of vegetation restoration effects were ordered as followjng: Leucaena leucocephala(0.795) > Zenia insignis(0.631) > Tectona grandis(0.583) > Cinnamomum camphora(0.541) > Acrocarpus fraxinifolius(0.433) > Syzygium cumini(0.391) > Caesalpinia sappan(0.381). 3) There were some differences in the effects of different vegetation restoration modes, Leucaena was classified to 1 level(optimal), legume 2-level(good), teak and camphor 3 level(middle), fruit tree, black ink tree 4 level(poor). 4) Leucaena and legume were the pioneer species of nitrogen fixation, occupying the ecological niche in the early stage of succession and adapting to the environment in the early stage of succession, it had obvious advantages in physiological characteristics. 5) Therefore, in the early stage of vegetation restoration in karst rocky desertification areas, the selection and allocation of suitable pioneer species should be carried out to take the lead in restoring the basic structure and function of plant community, which is conducive to the invasion and settlement of subsequent dominant species in succession and the acceleration of the process of vegetation restoration and succession. 6) An example verifies the feasibility of using entropy weighted grey relational analysis method for evaluation of vegetation restoration effect, and provides a new method for quantitative evaluation of vegetation restoration effect, which has certain practical value and popularization significance.更多还原