湖南芦头林场甜槠天然林群落结构特征

Community structure of Castanopsis eyrei natural forest in Lutou Forest Farm in Hunan Province

甜槠林是亚热带典型的常绿阔叶林之一。本文对湖南芦头林场甜槠天然林群落结构特征进行调查和分析。结果表明:甜槠天然林群落中有维管植物10科12属14种,其中甜槠优势十分明显。根据分布区类型对群落进行分析,发现其中10种植物都属于热带亚洲分布,占比58.82%。群落垂直结构明显,在乔木层中甜槠为第一优势种,重要值为60.56;灌木层中杜鹃和垂丝卫矛为主要优势种,重要值分别为53.00和32.49;草木层中则是以甜槠幼苗和肾蕨为多,重要值分别为24.94和20.28。群落三个层次的多样性都较低;乔木上层和中层密度大,下层密度低。芦头林场甜槠群落总体上表现稳定,有较好的增长空间,优势种地位突出,伴生种数量较少。研究结果可为森林经营管理提供科学依据。

Castanopsis eyrei forest is one of the typical broad-leaved evergreen forests in subtropical regions.The community structure characteristics of C.eyrei natural forest were investigated and analyzed by setting sample plots in Lutou Forest Farm in Hunan Province.The results indicated that there were 14 species of vascular plants belonging to 12 genera from 10 families,and the C.eyrei was the dominant one.By analyzing of the areal type of community,it was found that 10 species of plants were distributed in tropical Asia,accounting for 58.82%.Vertical structure of the community was obvious,and C.eyrei was the dominant species in the arbor layer with an important value of 60.56.In shrub layer,Rhododendron simsii and Euonymus oxyphyllus were the main dominant species with important values of(53.00)and(32.49)respectively.In the herb layer,the most two common species with their important values were C.eyrei saplings(24.94)and Nephrolepis cordifolia(20.28).The diversity of the three levels of the community is low.Trees have high density in upper and middle layer and low density in lower layer.In conclusion,C.eyrei community in Lutou Forest Farm is stable for the time being and has a good growth space.The dominant species position of community is prominent,but the number of associated species is scarce.The research results can provide scientific basis for forest management.