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运用相关与回归的数理统计方法，对茌梨成龄树（４０～１００年生）枝量和叶面积两个因素的分析，其正相关达高度显著水平，相关系数（ｒ）＝０．９８９１（ｄ＝０．００１），达高度显著水平。求得叶面积（）依枝量（Ｘ）的直线回归，即经验公式：ｙ＝０．０４２４８４７５９Ｘ－４９４．７４３７２５以此估计每亩叶面积与按枝类抽样所得叶面积的符合程度平均达９６．３９％，好的园片达到９９．５％，因此，完全可以用于田间调查，是一种简便易行、快速有效的叶面积研究方法。
Correlation and regression mathematical statistics were used to analyze the correlation between the branch quantity and leaf area of adult tree (40-100 years old), and the correlation coefficient (r) was 0.9891 ( d = 0.001), reaching a significant level of height. Obtain the linear regression of leaf area () and branch amount (X), that is, the empirical formula: y = 0.042484759X-494.743725, so as to estimate the coincidence of the leaf area per mu .39% of the total area, and a good area of 99.5%. Therefore, it can be completely used for field investigation and is a simple, fast and effective leaf area research method.