Effects of Different Afforestation Densities on the Growth of Large-diameter Timber of Corymbia torelliana
A completely randomized block design was used to analyze the effects of different afforestation densities on the growth of large-diameter timber of Corymbia torelliana,providing a reference for the cultivation of large-diameter timber plantations of C.torelliana for solid wood use.The results showed that three different afforestation densities had a highly significant impacted on the diameter at breast height(DBH),tree height,individual volume,number ratio and volume ratio of large-diameter classes of 22-year-old C.torelliana.They also significantly affected its survival rate,volume and dispersion.At a density of 1 000 plants·hm‒2,the survival rate,DBH,tree height,individual volume,large-diameter volume,stand volume,and net profit all reached their maximum values,with increases of 21.35%,18.79%,18.35%,55.89%,100.00%,14.94%,and 74.44%,respectively,compared to the 1 667 plants·hm‒2 density.The dispersion was 1.022,close to the critical value of 1.The best growth indicators for C.torelliana large-diameter timber plantations were observed at a density of 1 000 plants·hm‒2.At 22 years of age,the number of surviving trees was 846 plants·hm‒2,the stand volume reached 276.80 m3·hm‒2,and the net profit was 276 617 yuan·hm‒2,demonstrating high productivity and economic benefits.
NETL
NSTL
万方数据
