湘中丘陵区3种林分林下植物多样性与土壤特性研究

在湘中丘陵区选取针叶林、针阔混交林和阔叶林为研究对象,研究三种林分林下植被多样性、土壤理化性质及其相关关系。结果表明:三种林分林下植物多样性总体表现为灌木层明显高于草本层,阔叶林、针阔混交林高于针叶林。土壤有机质、全N和全P含量基本表现为随土层加深而下降的规律。土壤含水率与各项多样性指标不相关,土壤容重、p H值与灌草层各多样性指数呈负相关关系,有机质、全N与灌木层均匀度指数呈负相关关系,有机质与草本层均匀度指数呈极显著正相关关系(P0.01),全P、全K与灌木层多样性指数呈显著正相关关系(P0.05)。

The understory plant diversity and soil properties of three forest types in hilly region of central Hunan Province

This paper selected coniferous forests,coniferous and broadleaved mixed forests and broadleaf forests as the research object in the hilly region in central Hunan Province,to study species diversity of undergrowth vegetation,soil physical and chemical properties,and correlation between them in three forest types.The results showed that plant diver-sity index of shrub layer were all higher than herb layer,coniferous and broadleaved mixed forests and broadleaf forests were higher than coniferous forests.The contents of soil organic matter,total N and total P showed significantly decreased with increasing soil depth.The soil water content was not related with the diversity indexes.Soil bulk density and pH had negative relativity with the diversity index,organic matter and total N had negative relativity with shrub layer evenness in-dex,but organic matter had significant relativity with herb layer evenness index (P <0.01),total P and total K had sig-nificant relativity with shrub layer diversity indexes (P <0.05).