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研究不同成熟度群落物种的共存状态,了解群落演替过程中结构的动态变化,对揭示森林不同发育时期的群落构建机制具有重要意义。本研究基于鼎湖山南亚热带常绿阔叶林20 ha固定监测样地(以下简称鼎湖山大样地)2010年植被调查的数据,根据径级与林龄将鼎湖山大样地划分为成熟林和过熟林两个斑块,对其群落物种组成、区系特征及径级结构进行了初步的比较。研究发现:(1)成熟林和过熟林种类组成的群落相似性系数高、物种多样性指数相近,以及锥栗(Castanopsis chinensis)重要值相似,但物种数、密度、总胸高断面积、物种重要值等有所不同;(2)热带区系成分在两个斑块均占优势,但以过熟林的比例较高;(3)两个斑块虽然所有活立木径级结构分布均呈倒“J”型,但在同径级个体群重要值比较中,成熟林中径级个体群重要值较高,而过熟林则是大径级个体群重要值较高。由此可见,鼎湖山大样地的成熟林与过熟林虽属于同一类群落的演替顶极阶段,但群落结构上却存在差异,推测在林窗作用下不同发育时期的群落存在不同的构建过程。
Studying the coexistence status of species with different maturity communities and understanding the dynamic changes of structure during community succession are of great significance to reveal the community construction mechanism in different developmental stages of forest. Based on the 2010 vegetation survey data of 20 ha fixed monitoring plots of Dinghu Mountain subtropical evergreen broad-leaved forest (hereinafter referred to as Dinghushan large sample site), this study divided the Dinghu Mountain large-scale plots into mature forests And over mature forest two plaques, the community species composition, floristic characteristics and diameter structure of a preliminary comparison. The results showed that: (1) The community similarity index of mature and over-mature forest was high, the species diversity index was similar, and the important value of Castanopsis chinensis was similar, but the species number, density, total area of chest height, (2) Tropical fauna is predominant in both patches, but overribed forest is higher; (3) The distribution of diameter-class structures of all living trees in both patches shows a However, at the same level with the important individual value, the important value of the diameter individual group is higher in the mature forest, while the over-mature forest is the higher value of the big diameter class individual group. Thus, although mature and over-mature forests in Dinghushan large sample plots belong to the climax stage of the same community, there are differences in community structure. It is speculated that there are different communities in different developmental stages under the influence of gap gaps Build process.