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以海南岛生态关键区原始天然林和处于演替早期阶段的天然次生林为研究对象,对其物种组成、林分结构、物种多样性进行对比分析,旨在为退化的天然次生林恢复提供必要依据.结果显示:原始天然林和天然次生林径阶结构之间存在显著差异(P=0.045);原始天然林、天然次生林的胸高断面积分别为(32.0±7.9)m~2/hm~2、(6.4±3.9)m~2/hm~2,株数密度分别为(1 460±310)/hm~2、(81±29)/hm~2,原始天然林结构参数显著优于天然次生林(P<0.05);原始天然林Shannon指数(3.00±0.30)显著高于天然次生林(2.16±0.27)(P<0.01);原始天然林物种丰富度(34±5)极显著高于天然次生林(16±3)(P<0.001);物种组成方面,PCo A排序分析、聚类分析表明两类森林之间相似度较低,Jaccard相似度系数为0.068.本研究表明,两类森林在物种组成和林分结构上存在着巨大差异,40年的天然演替时间远不够天然次生林恢复到理想的水平,应合理采取土壤改良、间伐等营林措施加速天然次生林自然演替的进程.
In order to provide the necessary basis for the restoration of degraded natural secondary forests, the primary natural forests in the ecologically crucial areas of Hainan Island and the natural secondary forests in the early stages of succession were studied for comparative analysis of their species composition, stand structure and species diversity. The results showed that there was a significant difference (P = 0.045) between the original natural forest and the natural secondary forest. The area of thoracic and pheasant of the native natural forest and the natural secondary forest were (32.0 ± 7.9) m ~ 2 / hm ~ The number of plant species in the natural forest was significantly higher than that in the natural secondary forest (P <0.05), and the number density was (1 460 ± 310) / hm 2 and (81 ± 29) / hm 2 respectively. ). The Shannon index (3.00 ± 0.30) of the natural forest was significantly higher than that of the natural secondary forest (2.16 ± 0.27) (P <0.01). The species richness of the natural forest was significantly (34 ± 5) (P <0.001). In terms of species composition, the PCo A ranking analysis and cluster analysis showed that the similarity between the two types of forests was low, and the Jaccard similarity coefficient was 0.068. The results showed that there were significant differences in species composition and stand structure There is a huge difference, 40 years of natural succession time is far from natural secondary forest restored to the ideal level should be Reason to soil improvement, thinning and other silviculture measures to accelerate the natural secondary forest natural succession process.