PLANT DIVERSITY IN QIANYANZHOU AFTER 20 YEARS OF SMALL WATERSHED TREATMENT
PLANT DIVERSITY IN QIANYANZHOU AFTER 20 YEARS OF SMALL WATERSHED TREATMENT
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发表时间：
2005
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通讯作者：
L. Qi
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作者：
L. Qi
通过20年的治理，对某小流域的物种多样性进行了调查。结果表明，林冠上层物种优势度指数高于其他各层，人工林高于次生林和枫香林。从总体上看，12个群落灌木层的优势度指数较小，平均为0.17。在草本层中，驴的优势度指数较高。草本层,白茅(Imperata cylindrica var.主要群落（0.53）和驴。（2）木-无芒雀麦群落（0.51）。林冠层物种多样性指数较高。而在其他群落中均较低，尤其是在人工林中最低。林冠层物种多样性指数以羊草最高;福尔摩沙林（2.61）。林下各层的变化趋势相似，以马尾松+湿地松林最高。除马尾松+山苍子和板栗+山苍子外，人工林的物种多样性指数均高于次生林。台湾森林。灌木层的丰富度指数最高，林冠层和草本层的丰富度指数与灌木层的丰富度指数相似。台湾森林。次生林的丰富度指数高于人工林。草本层的均匀度指数和整齐度指数均高于灌木层，但驴除外。光瓣雀麦和野雀麦I. n.圆柱变种主要看台。在冠层中，驴的均匀度高达0.76。C.板栗+ L.台湾山雀和驴马尾松+ L.山苍子人工林林分的生物量值低于次生林和山苍子人工林;台塑屹立。灌木层中，除板栗+枫香林外，其余人工林的均匀度最高。灌木层与其他群落的多样性指数差异较大，而羊草群落的多样性指数与其他群落的差异较大。枫香林是位于人工林与天然次生林之间的过渡类型。
The species diversity of a small watershed was investigated following 20 years treatments. Our results showed that the species dominance index of the upper forest canopy layer was higher than other layers and was higher in the artificial forests than that in secondary forests and Liquidambar formosana stands. As a whole, the dominance index for the shrub layer of the 12 communities investigated was small, averaging 0.17. For the herb layer, the dominance index was high in the Ass. Imperata cylindrica var. major community (0.53) and the Ass. Loropetalum chinense-Bromus remotiflorus community (0.51). The species diversity index was high in the canopy layer of the L. formosana forest and natural Pinus massoniana forest but was low in other communities and, in particular, was lowest in the artificial forests. For the canopy layer, the species diversity index was the highest in the L. formosana forest (2.61). A similar trend was found in the subcanopy layers with the highest value found in the P. massoniana + P. elliottii forest. Also, the species diversity index was higher in the artificial forests than that in the secondary forests except for the P. massoniana + Litsea cubeba and Castanea mollissima + L. formosana forests. The richness index was the highest in the shrub layer for all communities and was similarly high in both the canopy and herb layers as the shrub layer in the L. formosana forests. The richness index was higher in secondary forests than that in artificial forests. The evenness index or uniformity index in the herb layer was higher than that in the shrub layer except for the Ass. Ldoropetalum chinense-Bromus remotiflorus and Ass. I. cylindrica var. major stands. For the canopy layer, evenness was as high as 0.76 in the Ass. C. mollissima + L. formosana and Ass. P. massoniana + L. cubeba stands whereas other artificial forests had lower values than that in secondary forests and L. formosana stands. In the shrub layer, evenness was the highest in the artificial forests except for the Castanea + Liquidambar forest. The diversity indices showed large differences between the shrub layer and other communities, and the L. formosana forest showed properties that can be considered atransitionaltype between artificial and secondary forests.