In this paper, 196 plots and 460 larches were selected as the material, and analyzed the oriented exponential order site class index curve model of larches located at Wangyedian in Chifeng City, Inner Mongolia. The forestal statistical analysis software (SPSS 18.0) was used to data fitting and analytic comparison of larch plantation data. The results showed that: the oriented Mitstcherlich curvilinear function was the more appropriate model of oriented larch plantation site class index curve after comprehensive considering of fitting accuracy, curve trend, distribution trend of sampling points and residual distribution. Based on regressive Mitstcherlich model, the paper selected 30a larches planted and operating level confirmed the exponential distance is 2m with 12 exponential orders, and then drew the site class curve cluster. Furthermore, the 12 exponential orders site class index table of larches located in Wangyedian, Chifeng City, Inner Mongolia was worked out.

本文以196个样地和460株落叶松为材料，分析了内蒙古赤峰市王野店落叶松的定向指数级位点类指数曲线模型。采用森林统计分析软件（SPSS 18.0）对落叶松人工林数据进行数据拟合和分析比较。结果表明：综合考虑拟合精度、曲线趋势、采样点分布趋势和残差分布，定向Mittcherlich曲线函数是定向落叶松人工林立地等级指数曲线的较合适模型。基于回归Mitstcherlich模型，选取30a个落叶松种植，作业水平确定指数距离为2m，12个指数级，绘制场地类曲线簇。此外，