Species diversity and floristic analysis of the Pinus dabeshanensis community
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摘要: 设置22个20m×20m的样地，对大别山五针松群落的物种多样性和区系成分进行了研究。结果显示，8800m2的样地内共有维管植物71科152属209种。其中，蕨类植物4科5属6种，裸子植物3科3属4种，被子植物64科144属199种。蔷薇科、樟科、菊科、杜鹃花科、豆科和禾本科等为优势科，所含物种较多。分析结果表明，大别山五针松群落种子植物区系起源古老，地理成分复杂，67个科中，世界分布、热带和温带分布的科分别有21、31和15个，显示出由热带向温带过渡的特性。147个属中，热带成分共43属，占总属数（不包括15个世界广布属）的32.58%；温带成分共有89属，占总属数的67.42%，并以北温带为主。群落垂直结构分为乔木层、灌木层和草本层，其中，Margalef指数、Simpson和Shannon-Wiener指数均以灌木层最大，其次为乔木层，草本层最低。灌木层与草本层的Pielou指数相近，且均大于乔木层。Abstract: The species diversity and floristic components of the Pinus dabeshanensis community were studied based on 22 sample plots (20 m×20 m). The results showed that there were 209 vascular plant species in total belonging to 152 genera and 71 families, with a total area of 8800 m2. Among them there were 4 families, 5 genera, and 6 species in Pteridophyte; 3 families, 3 genera, and 4 species in Gymnosperm, and 64 families, 144 genera, and 199 species in Angiosperm. Rosaceae, Lauraceae, Compositae, Ericaceae, Leguminosae, and Gramineae were the dominant families in regards to species number in the studied community. Floristic analysis revealed that the flora was ancient and the geographical components were complex. Among 67 families, 21, 31, and 15 belonged to cosmopolitan, tropical, and temperate distribution, respectively. In addition, 43 and 89 genera belonged to tropical and temperate distribution, accounting for 32.58% and 67.42% of the total, respectively. The Margalef (R), Simpson (D), Shannon-Wiener (H), and Pielou (E) indices were determined for the arbor, shrub, and herb layers. Except for the diversity index E, the other indices were the highest for the shrub layer, followed by the arbor layer, and finally the herb layer. The value of E was similar for the shrub and herb layers, which were both higher than that of the arbor layer.
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Keywords:
- Pinus dabeshanensis /
- Community /
- Species diversity /
- Floristic analysis
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