柳杉人工林全周期经营目标树密度研究

[Objective]Taking the Cryptomeria plantation in Pingba district of Guizhou Province as the research object,the study on target tree density management of the whole cycle of cryptomeria plantation is of great significance for improving the stand quality,cultivating high-quality large-diameter timber and sustainable forest management.[Methods]Based on 6a continuous survey data from 2016 to 2022,a total of 60 pieces of fixed standard land data with an area of 0.06hm2(20mx30m)were used to construct a stand density control map by using the models of equal tree height line,equal diameter line,maximum density line,equal sparse line and equal sparse density line.The target tree density in each growth stage of Cryptomeria plantation was obtained.[Results]Under the near-nature management theory system,taking target tree management technology as the core and combining with the actual growth situation of Cryptomeria,the growth of cryptomeria plantation was divided into five stages,and the target tree density of each growth stage was obtained:when cr yptomeria failed to meet the selection criteria of target trees in the group building and competition stages,no target tree was selected;When the growth of Cryptomeria entered the quality stage,the target tree selection was satisfied,and the target tree density was 295～590 trees·hm-2.The target tree growth stage is 90～180 trees·hm-2,and the large diameter wood reserve stage is 60～120 trees·hm-2.[Conclusion]Based on the stand density control map,this paper studied the target tree density in each growth stage of Cryptomeria plantation,providing a new method for density control of cryptomeria plantation and theoretical reference for sustainable management of cryptomeria plantation.