杭州西湖山区不同植被类型植物多样性比较研究

Diversity index of different vegetation types in the West Lake hills of Hangzhou

对杭州西湖山区常绿阔叶林（EBLF）、落叶阔叶林（DBLF）和针叶阔叶混交林（NBLMF）3种植被类型的群落多样性指数进行比较。结果表明：落叶阔叶林具有较高的物种多样性，针叶阔叶混交林物种多样性较低；在垂直结构物种多样性比较中，常绿阔叶林和针叶阔叶混交林为灌木层〉乔木层〉草本层，而落叶阔叶林为灌木层〉草本层〉乔木层；枯立木在常绿阔叶林中主要存在于6～10m高度，而落叶阔叶林和针叶阔叶混交林中主要存在于3～4m高度。与其他各地植被类型相比，常绿阔叶林和落叶阔叶林群落物种多样性随纬度增加而减少。

Diversity indexes of plant communities in three vegetation types of the West Lake hills, Evergreen Broad-Leaved Forest （EBLF） ,Deciduous Broad-Leaved Forest （DBLF） and Needle and Broad-Leaved Mixed Forest （NBLMF） , were compared. Results show higher plant community diversity in DBLF and lower diversity in NBLMF. Diversity indexes of different forest layers in EBLF and NBLMF are in the following order： shrub layer 〉 tree layer 〉 grass layer; and shurh layer 〉 grass layer 〉 tree layer in DBLF. Dead trees are 6 m to 10 m high in EBLF and 3 m to 4 m high in DBLF,and NBLMF. In comparison with other vegetation belts,community diversity index decreases with increase in latitude in EBLF and DBLF.