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对宜昌县防护林的地理区位与立地类型特征调查，采用模糊聚类分析法对立地类型进行划分，并由理查德方程和数量化理论Ⅰ模型得出编制该地立地指数的预测方程为：Ｙｉ＝８．０４＋３．６１Ｘ１１＋１．４６Ｘ１２＋１．０８Ｘ５１＋１．０１Ｘ５２＋２．１６Ｘ６１＋２．５２Ｘ６２－０．８７Ｘ８１＋０．７７Ｘ８２＋１．１８Ｘ８３＋０．６０Ｘ８４－０．２６Ｘ８５－１．１０Ｘ９１＋０．２０Ｘ９２，所调查的１１个样地的立地质量等级为１３ｍ以上为好，１１～１３ｍ为中等，１１ｍ以下为差。从而建立了宜昌县防护林立地分类与评价系统，为长江防护林工程建设提供了科学依据。
Based on the investigation of the geographical location and site type characteristics of shelterbelt in Yichang County, the site type was classified by fuzzy cluster analysis. The prediction equation of the site index was derived from Richard equation and quantitative theory Ⅰ model as follows: Yi = 8.04 + 3.61X11 + 1.46X12 + 1.08X51 + 1.01X52 + 2.16X61 + 2.52X62-0.87X81 + 0.77X82 + 1.18X83 + 0.60X84-0.26X85-1.10X91 + 0.20X92, and the site quality of 11 plots surveyed is above 13m As well, 11 ~ 13m is medium, 11m is poor. Thus, the classification and evaluation system of shelterbelts in Yichang County was established, which provided a scientific basis for the construction of the shelterbelt in the Yangtze River.