福安市马尾松林分密度效应的研究

运用随机抽样法抽取马尾松成熟林分50个小班,调查胸径、树高、单位蓄积量及密度等测树因子,运用回归分析法进行测树因子相关性分析,结果表明,林分蓄积量对于密度、胸径、树高之间存在显著线性关系,其相关性数学模型可用三元线性回归方程y=b0+b1x1+b2x2+b3x3表示,其中,密度是影响林分蓄积量的主导因素。相关性变化趋势分析表明,在兼顾林分产量和林木径级的情况下,合理保留密度每667 m2为105株。

Density Effect of Pinus massoniana Stand

Fifty subcompartment of matured stand of Pinus massoniana were extracted by using the random sampling method;measurement tree factors(DBH,tree height,volume & density) were investigated;using the regression analysis,the correlation of measurement factor was analyzed.Result shows that volume have significant linear relationship among density,DBH,tree height;its relevance mathematical model can be expressed by three variable linear regression equation y = b0 + b1x1 + b2x2 + b3x3;among them,the density is the dominant factor of affecting volume stand.The analysis on variation trend of the correlation shows that :consideration to yield & tree diameter,reserved density of 105 trees was considered to be optimal.