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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 diversity 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 p H had negative relativity with the diversity index,organic matter and total N had negative relativity with shrub layer evenness index,but organic matter had significant relativity with herb layer evenness index( P 0. 01),total P and total K had significant relativity with shrub layer diversity indexes( P 0. 05).