杉木造林密度生长效应规律的研究

Effects of Densities on Growth of Chinese Fir Plantation

本文通过对２９年生五种不同造林密度杉木生长规律的研究结果表明：平均木和优势木胸径均随着密度增大而明显减小；树高随着密度增大而有减小的趋势，但不明显；平均单株材积随密度增大而减小；林分现存蓄积量随密度增大而减小，但没有达到显著水平．因此，在确定造林密度时，应控制在１８７５～３７５０株／ｈｍ２，培育大径材应控制在１８７５～２８０５株／ｈｍ２．

This paper researched into the effects of five kinds of densities (1875, 2805, 3750, 4500 and 6000 trees per hm2) on growth in 29-year-old Chinese fir plantation. The results showed that the D. B. H of mean tree and dominant tree decreased obviously with the increase of density, so did the mean individual volume.The height of mean tree and dominant tree and the current stocking per unit also followed the law, but not obviously. The effects of densities on growth indicated that afforestation density would be controlled within 1875 to 3750 trees per hm2,and the density must be controlled within 1875 to 2805 trees per km2 for culturing large diameter timber.