Effect of Thinning Intensity on the Growth of Cryptomeria japonica Forests
In this study,tree height,diameter at breast height,volume and biomass of Cryptomeria japonica were measured in Beijianghe Forest Farm,Guangxi Rongshui Miao Autonomous County.The effect of thinning intensi-ty on the growth of Cryptomeria japonica forest was studied.The results showed that under different thinning in-tensities,the various growth indicators and biomass of Cryptomeria japonica were significantly affected.Especial-ly at 30％thinning intensity,the growth performance of Cryptomeria japonica is most significant.Moderate nur-turing and thinning can promote the growth of height,diameter at breast height,volume,and biomass of Crypto-meria japonica trees,but excessive thinning intensity may lead to adverse effects.The results indicate that moder-ate thinning intensity has a positive impact on the growth of Cryptomeria japonica forests.With the increase of thinning intensity,the biomass of roots,leaves,branches,and whole plants in some treatment groups showed an increasing trend,indicating that moderate thinning can promote the growth and biomass accumulation of Crypto-meria japonica.This study provides a theoretical basis for the scientific nurturing of Cryptomeria japonica forests.
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