| 摘要: |
| 为了研究混交林群落植物多样性，对黄土高原子午岭林区山杨纯林、辽东栎纯林及山杨-辽东栎混交林3种林型植物多样性的变化进行了研究。结果表明，子午岭林区由先锋群落（山杨纯林）向顶极群落（辽东栎纯林）演替的过程中，其群落物种丰富度指数与植物种类多样性均呈下降趋势，而混交林类型是处于演替的中间过渡阶段，所以其物种丰富度与植物种类多样性也介于以上两种林型之间，即山杨纯林〉山杨-辽东栎混交林〉辽东栎纯林。山杨纯林、山杨-辽东栎混交林和辽东栎纯林的群落物种丰富度指数（Gleason指数与Margalef指数）与植物物种多样性指数（Shannon-Wiener指数）在草本层、灌木层及乔木层均呈下降趋势，除辽东栎纯林的乔木层外，Pielou均匀度指数在乔木层、灌木层和草本层差异较小。植物种类多样性与森林群落稳定性之间存在一个最优点，植物种类的多样性并不能完全代表群落的稳定性，但却是反映森林群落稳定性的必要条件。 |
| 关键词: 山杨纯林 辽东栎纯林 山杨-辽东栎混交林 植物多样性 群落稳定性 子午岭林区 |
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| 基金项目:教育部新世纪优秀人才培养计划项目(NCET-04-0955)；西北农林科技大学拔尖人才和创新团队计划项目 |
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| Change of plant diversity of Populus davidiana,Quercus liaotungensis and their mixed forest in Ziwuling area of Loess Plateau |
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| Abstract: |
| The plant diversity of the three types of forests:Populus davidiana,Quercus liaotungensis,and Populus davidiana-Quercus liaotungensis mixed forest in Ziwuling forest area of the Loess Plateau was studied.The results showed that in the proccss of from the vanguard community(Populus davidiana)to the climax community(Quercus liaotungensis)succession,the plant species richness index and plant diversity index assumed the drop tendency,but the mixed forest type was in the middle stage of succession,therefore its species richness index and plant diversity index was also between the two kinds of forest types, namely,Populus davidiana>Populus davidiana-Quercus liaotungensis mixed forest>Quercus liaotungensis.Each of the change of plant species richness index (Gleason index and Margalef index),and diversity index (Shannon Wiener index) in herbage layer、shrub layer and arbor layer both assumed the drop tendency.There are little difference of pielou evenness index in the arbor layer,shrab layer and herbage layer,except in the arbor layer of cuercus liaotangensis.In the study of the plant diversity and relation of community′s stability of forest,we found an advantageous point exist between the plant diversity and stability of the forest community,namely,the plant diversity can not totally represent the stability of community,but it is an essential index to show the forest community's stability. |
| Key words: Populus davidiana Quercus liaotungensis Populus davidiana-Quercus liaotungensis mixed forest plant diversity community stability Ziwuling forest area |
