Effect of Afforestation Density on the Growth and Dry Matter of Pinus massoniana Lamb.
In order to explore the effects of different afforestation densities on the growth and dry matter of Pinus massoniana,this experiment planted Pinus massoniana on March 9,2008.Five planting densities were used dur-ing the planting process,namely 2000,3000,4000,5000,and 6000.Each planting density was divided into treatment group A,treatment group B,treatment group C,treatment group D,treatment group E,and treatment group F,with three replicates for each treatment group;The experiment ended in December 2023,after which the growth,wood dry matter,and wood chemical composition indicators of Pinus massoniana were measured;The diameter at breast height and crown width of group C were signifiicantly lower than those of group A and group B(P＜0.05),but the differences in tree height,branch height,and individual plant volume between group C and group A and group B were not significant(P＞0.05);The diameter at breast height,height under branches,crown width,and individual plant volume of group D were significantly lower than those of group A and group B(P＜0.05);Except for significantly lower diameter at breast height(P＜0.01),the height under branches,crown width,and individual plant volume of group E were significantly lower than those of group A and group B(P＜0.05);The diameter at breast height,tree height,crown width,and individual volume of group F were significantly lower than those of group A and group B(P＜0.01);There was no significant difference in individual volume and wood basic density of Pinus massoniana under different afforestation densities(P＞0.05);The highest amount of standing wood preservation was observed in treatment F group,and there was no significant difference(P＞0.05)compared to treatment E,treatment D,and treatment C groups.However,the dry matter yield of wood was highest in treatment F group;There was no significant difference in the effects of different afforestation densities on the components of lignin,cellulose,pentosan,benzyl alcohol extract,and 1％NaOH extract of Pinus massoniana wood(P＞0.05);The afforestation density has a significant impact on the diameter at breast height,height under branches,individual volume,and crown width of Pinus massoniana;Cultivating large-diameter Pinus massoniana can choose afforestation with low density;For use as raw materials or pulp for fiber particleboard,high planting density can be selected for afforestation;The afforestation density does not affect the chemical composition of the wood of Pinus massoniana.
万方数据
维普
