杉木人工林多种立地指数曲线簇的展开和比较

选择Richards生长函数作为开化杉木人工林林分优势高和林龄导向曲线建模的基本模型,采用比例法、标准差法、差分方程法以及多导向平移法等展开了4簇立地指数曲线。通过拟合精度检验,发现标准差法展开的曲线簇拟合误差较大,而其余3种方法的拟合结果均较理想,误差不超过半个指数级(1m)。作者认为在目前的杉木经营水平下,差分方程法更为简便实用。

Expansion and Comparison of Four She Index Curve-groups for Chinese Fir Forest Plantation

Selecting Richards function as a basic model to establish the guided curve between stand dominant height and age of C. lanceolata plantation, the four methods (proportion expression, standard deviation, different equation and multiple guided curves) were used to expand the each group of site index curves. The comparison results of fitting precision showed that the error of standard deviation method was the greatest, but the errors of others were less than a half site index class (1m). The authors suggested that the different equation method was a simple and practical method under current managing intensity.