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应用线性模型统计推断理论检验了杉木种源对立地指数曲线的影响。洪雅和鸡公山种源试验材料分析表明：（１）同一地区不同种源的立地指数不同，相同种源不同地区的立地指数也不同，这说明立地指数的差异是遗传和环境差异的综合体现；（２）不同种源立地指数曲线的斜率相同，即各种源优势高生长规律相同，因此可以用同一个模型来描述，这对杉木模型的通用性提供了很好的依据。
The linear model of statistical inference theory was used to test the impact of provenances on site index curve. Hongya and Jigongshan provenance test material analysis showed that: (1) the same area different provenance location index different from the same provenance in different regions of the site index is also different, indicating that the site index is a combination of genetic and environmental differences (2) The slopes of the in-situ index curves of different provenances are the same, that is, the growth laws of the superiority of all kinds of sources are the same, so the same model can be used for the description. This provides a good basis for the universality of the Chinese fir model.