北沟林场天然次生林植物群落结构及物种多样性研究

为了对森林群落结构及其物种多样性进行深入研究,掌握其发展变化规律,以便为有效开展生物多样性保护提供可靠依据,以河北省围场县北沟林场天然次生林为研究对象,从Raunkiaer生活型、多样性指数等方面对森林群落结构及物种多样性进行了研究.结果表明:(1)该区天然次生林物种丰富,共计117种植物,隶属58个科99个属；(2)高位芽植物在天然次生林植物群落中优势明显,其次为地下芽植物,其余生活型植物不占优势；(3)群落内部层片结构复杂,优势层片为大高位芽层片和中高位芽层片；(4)各群落的丰富度指数顺序为:草本层＞灌木层＞乔木层；多样性指数在各层之间呈现多样化趋势；而均匀度指数在各层物种之间差异显著,均匀度指数排序为:草本层＞灌木层＞乔木层.

Structural Characteristics of Plant Communities and Species Diversity of Natural Secondary Forests in Beigou Forest Farm

In order to understand forest community structure,species diversity and their changing dynamicsand therefore to provide a reliable basis for effective biodiversity conservation,the natural secondary forest inBeigou forest farm,Weichang County,Hebei Province was selected to investigate forest communities structure and species diversity including Raunkiaer life-form,diversity index,etc.The results showed that thestudy area had vegetation resources of 117species belonging to 58families and 99genera.Phanerophytesdominated in the communities,followed by geophyte,while other kinds of plant showed no obvious advantages.The internal lamellar structure of the community was complex,as dominated by phanerophytes lamellarand in high bud lamellar.The richness index for each plant communities could 0 be ranked in a descending order as herb layer>shrub layer>tree layer.The diversity index differed among different layers.The evennessindex varied significantly between the layers of species,in the descending order as herb laye>shrub layer>tree layer.