The Stand Features of Pinus massoniana Plantation with Different Regulation Density in Danjiangkou Reservoir Area of Hubei Province
A Pinus massoniana plantation of Danjiangkou reservoir of Hubei Province was selected as object to analyze the stand features under different regulation density from three respects of the stand structure,natural re-generation status and biodiversity.The results showed that average tree height,average DBH,dominant height,and under branch height were significantly increased with the stand density decreased.At the same time,the height dis-tribution in three densities of Pinus massoniana plantation all showed a normal distribution curve,but the stand height structure at low density tended to be more complete.In high density stand,small diameter class trees were main components,but in low-medium density stand,the number of larger diameter tree was increased significantly. The number of regeneration species under forest of high density,medium density and low density P.massoniana were 5,7 and 8,respectively,and the dominant regeneration species were Quercus variabilis and Rhus chinensis. With the stand density increased,the number of regeneration seedlings,the ratio of saplings and seedlings to domi-nant trees gradually decreased.The seeding characteristic was more concentrated in height≥50 cm,and the stand was lack of low age old seedlings.The density decrease of Pinus massoniana stand promoted the increase of biologi-cal diversity of understory vegetation in some extent,but there were some differences on the variation trends of bio-logical diversity between different layers.
Pinus massonianaplantationregulation densitystand featuresnatural regenerationspecies diversityDanjiangkou reservoir area of Hubei Province
国家科技期刊平台
NSTL
万方数据
维普
