运用典型样方调查法,从龄级结构、静态生命表特征、存活曲线和4种聚集强度指标(分布系数R、负二项指数K、平均拥挤度指数 M*、聚块性指数PAI)等方面研究湖南阳明山国家森林公园甜槠次生林种群结构特征和分布格局。结果表明:1) 阳明山甜槠种群结构为纺锤形,属于衰退型种群;2) 甜槠种群在总体上存活数随龄级增加先上升后降低,存活曲线接近Deevey I型,即曲线凸型;3) 在研究样地内,甜槠种群的分布格局整体呈现为集群分布,符合最普遍的种群样式。种群结构和分布格局与生态因子、生物学特性密切相关,自然干扰和人为破坏也有一定的影响。
By using the methods of typical quadrat,the structure characteristics and distribution pattern of Castanopsis eyrei populations of secondary forest through age stucture,lifetable characteristics,survival curves and 4 aggregation intensity index (distribution coefficient R,negative binomial parameter K,mean crowding index M* and accumulation index PAI) were studied in the National Forest Park of Yangmingshan,Hunan.The results showed that:1)the age structure of the C.eyrei population of the Yangmingshan followed a spindle shape,which indicated that the population was declining;2)In general,the survival rate of C.eyrei population increased first and then decreased with the increase of age,the survivorship approximated the type of the DeeveyI.3)In the study plots,the distribution pattern of C.eyrei population showed cluster distribution which coincides with the most common pattern of population.The population structure and distribution pattern were closely related to ecological factors and biological characteristics,natural disturbance and human destruction also had certain effect.The research results can provide a theoretical basis for natural regeneration and conservation of dominant population of Yangmingshan secondary C.eyrei forest.
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