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1.材料和方法试验地设置在本所罗家冲工班后山,林地地势平坦,土层深厚,原为荒芜板栗林,树龄14年,土壤属第四纪红壤,肥力中等,面积20亩,分为6个小区,计560株,分别用不同方法、不同品种接穗进行高接换头试验。分析方法是将各因子加以数量化,经逐步回归筛选主导因子,建立嫁接成活率(y)与各内外因子(Xi)之间的多元线性回归方程,求算各项目类目的贡献率和回归系数。根据各因子之间或各因子与嫁接成活率之间的简相关,组成相关矩阵,用“通经相关”分析方法,
1. Materials and methods Experimentally set up in the Luo school work after the class mountain, the flat topography, deep soil, formerly barren chestnut forest, aged 14 years, the soil is Quaternary red soil, medium fertility, an area of 20 acres , Divided into six districts, accounting for 560 strains, respectively, with different methods, different varieties of scion for high-head test. The method of analysis is to quantify each factor, then select the dominant factor by stepwise regression, establish the multiple linear regression equation between the graft survival rate (y) and each internal and external factor (Xi), and calculate the contribution rate and regression of each item category coefficient. According to the correlation between the factors or between the factors and the graft survival rate, the correlation matrix is formed. By using the “pass through correlation” method,