凹叶厚朴一元立木材积方程的研究

Standing volume equation based on both DBH and measurements for Magnolia officinalis ssp.biloba

实测 2 39株凹叶厚朴样木的胸径和材积 ,采用遗传算法、三次设计法和改进单纯形法等拟合一元材积方程并与对数线性化最小二乘法进行比较。结果表明 :采用遗传算法、三次设计法和改进单纯形法等建立一元材积方程优于对数线性化最小二乘法 ;三次设计及对数线性化最小二乘法的适用性检验统计量F值不能通过F检验 ,说明不能用三次设计及对数线性化最小二乘法拟合凹叶厚朴的材积方程 ;同时用模外 2 5株凹叶厚朴样木进行检验 ,遗传算法和改进单纯形法建立的一元材积方程的理论材积与实测材积相吻合。用遗传算法建立的立木材积方程编制了凹叶厚朴的一元材积表。表 3参 1

The standing volume equation based on both DBH for Magnolia officinalis ssp. biloba was first studied.By actually surveying the DBH and the volume for the 239 samplings of Magnolia officinalis ssp. biloba ,the one variable volume equation were established by the genetic algorithm,the three designs and the modified simplex,and were compared with the logarithm linearise minimization double multiplication method.The results indicated that the one variable volume equations established by the genetic algorithm,the three designs and the modified simplex were better than that by the logarithm linearise minimization double multiplication method,and the statistic F of volume equation established by the three designs and the logarithm linearise minimization double multiplication method didnt passes the F test;and the theoretical values calculated by the genetic algorithm and the modified simplex were identical with the observed values of the 25 sampling of Magnolia officinalis ssp. biloba of out model data.The standing volume table based on both DBH for Magnolia officinalis ssp. biloba was compiled.