南岭山地杉木人工林密度试验研究

Studies on the Density Experiment of Chinese fir Stands in Nanling Hilly Area

试验通过对南岭山地杉木密度试验林17年的连续观测,得到了在高立地指数等级条件下密度为:1620株/hm2、2475株/hm2、2925株/hm2、3510株/hm2,4种密度杉木试验林连续17 a的生长的观测值,用以分析不同密度对杉木林分生长的影响。试验结果表明:不同密度对林分的自然稀疏、林分平均胸径、林分单株材积和高径比有影响,对林分平均优势高、平均高影响不大。林分蓄积随林龄增加而递增,随密度增加而递增,当到一定年龄时差异不大。

The planting density experiment consists of four density treatments： 1 620 trees/hm^2,2 475 trees/hm^2 ,2 925 trees/hm^2,and 3 510 trees/hm^2. The density experiment stands of Chinese fir were investigated in Nanling hilly area of high site index stands. The result of the experiment showed that the different density levels impacted the natural thinning, the average diameter, the volume and radio of height to diameter; there was no significant effect on the dominant height and average height. The stands volume increased with the increase of stand age, with the increase of stand density, but the stand density had no significant effect when the stands were old enough.