大青山区油松人工林密度对林木生长影响的研究

在大青山区对油松人工林密度与其生长因子关系的研究指出,随着林分密度的增加林分平均胸径、冠幅呈减小趋势,二者呈幂指数函数关系,即在一定林分密度范围内,随着林分密度的增加,胸径和冠幅减小。树高随密度的变化不显著,而树木的高径比随密度增加呈上升的趋势,二者关系可拟合为对数曲线。该区油松人工林密度对生长因子影响的最大临界值阳坡为3 000株/hm2,阴坡为4 000株/hm2可作为调空密度的参考依据。

INFLUENCE OF THE DENSITY OF THE ARTIFICIAL FOREST OF PINUS TABULAEFORMIS IN DAQING MOUNTAIN ON THE GROWTH OF THE FOREST

The study on the relationship between density and growth factors of the artificial forest of Pinus tabulaeformis in Daqing Mountain showed: average chest height diameter and crown broadth decreased with the increase of stand density.And the relationship between them can be showed by the function of power and index.It means that under certain extent,the average diameter and crown broadth decreased with the increase of stand density.With the increase of stand density,the tree height didn't change remarkably.But the height diameter ratio of trees increased with the increased density.And the relationship between them can be simulated with logarithm curve.The critical maximum of stand density in Daqing Mountain,which affected growth factors,was 3000 stocks/ha in the sunny slope and 4000 stocks/ha in the shady slope.And it can be considered as the reference criterion to control the stand density.