探讨流溪河国家森林公园林分结构和植物多样性,旨在为其天然次生阔叶混交林森林经营和植物多样性保护提供理论依据。研究结果表明,1)流溪河国家森林公园植物多样性高,天然更新能力强。乔木树种和林下植物的单种科组成都在50%及以上,幼苗种类和数量较多,林分天然更新能力较强,幼树相对较少。2)林分郁闭度、株数密度、胸径差异大,林木空间布局有待调整。标准地郁闭度为0.64~0.90,株数密度为675~1 975株/hm²,胸径在5.0~44.5cm之间,林分空间分布多为团状分布,林木竞争处于中庸状态。3)乔木层植物多样性丰富,灌木层植物多样性受林分因子的影响。不同林层中,乔木层的4个指数相对较大;灌木层植物受郁闭度、平均胸径等林分因子的影响,草本层基本不受影响,幼树幼苗层受郁闭度的影响。因此,可进行森林抚育间伐,适度调整林分密度和空间分布,提高幼树幼苗的数量和质量,丰富林下灌木种类,提高流溪河国家森林公园植物群落的多样性和稳定性,确保森林持续稳定发展。

The stand structure and plant diversity of Liuxihe National Forest Park were discussed,so as to provide theoretical basis for forest management and plant diversity protection of its natural secondary broad-leaved mixed forest.The results showed that:1) Liuxihe National Forest Park had higher plant diversity and stronger natural regeneration ability.Single-species family composition of tree species and understory plants were 50% or more.There were quite more species and quantity of seedlings,and the natural regeneration ability of stands was strong,but young trees were relatively few.2) There were big differences in stand canopy density,stem density and DBH,and the spatial layout of trees needed to be adjusted.In sample-plots,the canopy density was 0.64~0.90,and the stem density was 675~1 975 plants per hectare,and the DBH was between 5.0~44.5 centimeter.The spatial distribution of stands was mainly in the form of clusters,and the forest competition was medium.3) The plant diversity of arbor layer was rich,and that of shrub layer was affected by stand factors.In different forest layers,the four indexes of arbor layer were relatively high.The shrub layer was affected by stand factors such as canopy density and mean DBH,and the herb layer was basically unaffected,and the sapling and seedling layer were affected by canopy density.Therefore,forest tending and thinning should be carried out,and stand density and spatial distribution of trees should be appropriately adjusted.The quantity and quality of saplings and seedlings should be improved,and understory shrub species should be enriched.The diversity and stability of plant community should be improved in Liuxihe National Forest Park,to ensure the sustainable and stable development of forests.