紫金山栓皮栎群落结构及物种多样性

在野外调查的基础上,对南京紫金山栓皮栎Quercus variabilis林的群落结构与物种多样性进行了研究。结果表明：紫金山栓皮栎群落植物种类丰富,有维管植物63科106属127种;地理成分较为复杂,区系过渡性特征明显;群落可以分为乔木层、灌木层和草本层3个层次。灌木层的丰富度指数、Simpson指数和Shannon-Wiener指数均最大,分别为16.2857±1.0187,0.8273±0.0255和2.1742±0.1117;乔木层次之,分别为10.1429±0.9992,0.7769±0.0217,1.7939±0.0954;草本层最小,分别为5.5711±0.4654,0.6873±0.0322和1.2943±0.0795。乔木层的物种均匀度最高,灌木层次之,草本层最小,分别为0.7933±0.0175,0.7822±0.0293,0.7774±0.0279。

Community structure and species diversity of a Quercus variabilis forest on Mount Zijinshan

Based on quadrat sampling,community structure and species diversity of a Quercus variabilis forest on Mount Zijinshan in Nanjing were analyzed. Results showed that there were 63 families,106 gener-a,and 127 species of vascular plants. The community could be divided into three layers of tree,shrub,and herb with species richness（S）,Simpson s （D）,and Shannon-Wiener s （H） indices in the shrub layer greatest followed by the tree and herb layers. Shrub indices were S = 16.285 7 ± 1.018 7,D = 0.827 3 ± 0.025 5,H = 2.174 2 ± 0.111 7; tree indices were S = 10.142 9 ±0.999 2, D = 0.776 9 ± 0.021 7, H =1.793 9 ±0.095 4; and herb indices were S = 5.571 1 ±0.465 4, D = 0.687 3 ± 0.032 2, H = 1.294 3 ± 0.079 5. The evenness （J） indices of the tree layer were largest （0.793 3 ± 0.017 5）, while those of the shrub （0.782 2 ±0.029 3） and herb layers （0.777 4 ±0.027 9） followed. Overall the floristic interims were obvious with abundant species diversity in this community of mixed vascular plants.