翁源青云山自然保护区亚热带常绿阔叶林群落结构和区系特征

目的 研究青云山自然保护区亚热带常绿阔叶林的群落结构和区系特征，为该区域森林生态系统及生物多样性保护提供参考。 方法 参照CTFS的调查技术规范，于2016年在广东翁源青云山省级自然保护区内设置了14个40 m×40 m的森林固定样地，对样地内胸径≥1 cm的木本植物进行每木调查。 结果 样地内共有胸径≥1 cm的木本植物216种、13 630株，分属52科110属；稀有种和偶见种分别占总种数的28.70%和43.98%。样地以杉木、木荷、罗浮柿、毛棉杜鹃花、黧蒴锥、栲、罗浮锥、米槠、华润楠、鼠刺、毛竹和甜槠为优势种，以樟科、山茶科、大戟科、金缕梅科、木兰科、蔷薇科、壳斗科、禾本科为优势科。52个科可划分为9个分布区类型，以热带性质为主，占总科数的65.39%，温带性质占总科数的15.38%；110个属可分为12个分类区类型，以热带性质为主，占总属数的70.00%,温带性质占总属数的26.36%。样地内所有个体径级结构呈倒“J”形分布，有丰富的小径级植株；记录到的物种数随起测胸径的增大而逐渐减少，无明显断层现象，群落总体更新良好，呈稳定增长型。 结论 青云山自然保护区亚热带常绿阔叶林群落物种组成丰富，群落总体更新良好并处于演替初期。

The Community Structure and Floristic Characteristics of Subtropical Evergreen Broadleaved Forest in Qingyunshan Nature Reserve,Guangdong

Objective To study the community structure and floristic characteristics of subtropical evergreen broadleaved forest in Qingyunshan Nature Reserve and to provide reference for the protection of forest ecosystem and biodiversity. Method According to the field investigation protocol of the Center of Tropical Forest Science (CTFS), 14 forest dynamic plots with the size of 40 m×40 m were established in 2016 in Qingyunshan Nature Reserve, Wengyuan, Guangdong Province. All the woody plants with diameter at the breast height (DBH) ≥1 cm were measured, tagged, and identified to species level. Result There were a total of 13 630 trees, with DBH≥1 cm, belonging to 52 families, 110 genera and 216 species recorded in the 14 plots. The rare and occasional species accounted for 20.7% and 37.6% of the total species, respectively. The dominant species were Cunninghamia lanceolata, Schima superba, Diospyros morrisiana, Rhododendron moulmainense, Castanopsis fissa, Castanopsis fargesii, Castanopsis faberi, Castanopsis carlesii, Machilus chinensis, Itea chinensis, Phyllostachys edulis and Castanopsis eyrei. The dominant families were Lauraceae, Theaceae, Euphorbiaceae, Hamamelidaceae, Magnoliaceae, Rosaceae, Fagaceae and Gramineae. The 52 families of 216 woody species can be classified into 9 flora distribution types, with tropical elements accounting for 65.39% and temperate elements accounting for 15.38% of the total of families. The 110 genera can be classified into 12 distribution types, with tropical elements accounting for 70.00% and temperate elements accounting for 26.36% of total genera. Diameter distribution of all individuals showed inverted J-shaped structure and small diameter individuals were relatively abundant. The amount of species gradually decreased with the increase of DBH classes. The community regeneration was relatively well with a stable pattern. Conclusion In conclusion, the community characteristics of the subtropical forest in Qingyunshan Nature Reserve has abundant species and relatively good regeneration process, although the community is still in the early successional stage.