贵州楠杆自然保护区楠木受胁因素与资源保护

Preliminary Study on Threat Factors and Protection Strategies of Phoebe zhennan in Nangan Nature Reserve,Guizhou Province

对楠杆自然保护区内楠木种群进行调查,分析资源现状及受胁因素,结果表明:(1)保护区楠木古树种质资源均分布在距离村寨或公路200m范围内;(2)不同立木等级受到的主要干扰因素不同,生境退化或丧失、直接采挖或砍伐是楠木种群资源受胁的关键因素。(3)生境退化或丧失是影响楠木古大树的比例最大的干扰因素,其次是直接采挖或砍伐、自身特性限制。(4)乔木层植物Margalef物种丰富度指数表现为中度干扰型>重度干扰型>轻度干扰型; Simpson优势度指数和Pielou均匀度指数表现为重度干扰型>轻度干扰型>中度干扰型; Shannon-Wiener指数呈重度干扰型>中度干扰型>轻度干扰型的趋势。

Through the investigation of Phoebe zhennan population in Nangan nature Reserve of Guizhou province,the resource status and threat factors were analyzed.The results showed that:(1) The germplasm resources of Phoebe zhennan ancient trees in the nature reserve were distributed within 200 m from the village or highway;(2) The main disturbance factors for different stumpage grades were different.Habitat degradation or loss,direct mining or logging were the key factors that affect the conservation of Phoebe zhennan population resources.(3) Habitat degradation or loss was the most disturbing factor affecting the proportion of Phoebe zhennan ancient trees,followed by direct mining or logging,and limitations on their own characteristics.(4)The order of species richness index of arbor layer plants was moderately disturbed > severely disturbed> slightly disturbed; The orders of dominance index and evenness index were severely disturbed > slightly disturbed > moderately disturbed; And the order of Shannon-Wiener index was severely disturbed > moderately disturbed > slightly disturbed.