【摘要】 本文以趋势面分析法研究了油松针叶中营养元素浓度的空间变异.结果表明,以二维二次趋势面可以很好地模拟K、Mg、zn和灰分浓度的空间变异情况;树冠营养元素浓度不仅有垂直方向的差异,而且有水平方向的差异,这种差异表现为树冠外部向内部的逐渐变化,据此,进行油松营养诊断时,应按树冠内部、中部和外部确定采样部位.更多还原

【Abstract】 Trend surface analysis was used to study the spatial variation in concentration of nutrient elements in the canopy of P. tabulaeformis. The results show that the phenomena of spatial changes in concentrations of K, Mg, Zn, and ash can be well simulated with 2-dimentional and quadratic tendency surfaces. The nutrient concentrations of needles not only vary along vertical but also along horizontal directions in the canopy. This indicates that there is a gradual change from the exterior to the interior of the crown. It is recommended that in sampling for determination of nutrient difficiency the position of interior or exterior of the canopy must be taken in consideration.更多还原