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选取６项叶片旱生结构指标：角质层厚度，栅栏组织厚度／叶肉组织厚度，细胞密集度，主脉厚度和主脉两端厚角细胞层数，观察测定了１３个核桃和铁核桃品种（优系）的抗旱性。方差分析结果显示，１３个核桃和铁核桃品种（优系）在每个抗旱性指标上均差异极显著，故此对各品种（优系）进行了两两之间的单因素多重比较。依据前３个指标利用绝对法对各品种（优系）抗旱能力的大小进行了排序，其抗旱能力的次序为：新野，西洛２号，香玲，西洛６号，西洛３号，西扶２号，辽核１优，西林３号，辽核４号，辽核１号，西洛１号，西林２号，西扶１号，铁核桃（娘青夹绵）。
The structure parameters of six species of leaves were selected as follows: the thickness of stratum corneum, the thickness of palisade tissue / the thickness of mesophyll, the cell density, the thickness of the main vein and the layers of the thick horn cells at both ends of the main vein. Thirteen varieties of walnut and iron walnut Excellent lines) of drought resistance. ANOVA results showed that 13 varieties of walnut and iron walnut (excellent line) had significant differences in each drought resistance index, so a single-factor multiple comparison was made between every two varieties. According to the first three indexes, the drought resistance ability of each breed (excellent breed) was sorted by absolute method. The sequence of drought resistance ability was Xinye, Xiluo No.2, Hongling, Xiluo No.6, Xiluo No.3, Xifu 2, Liao nuclear 1 excellent, Xilin 3, Liao nuclear 4, Liao nuclear 1, Xiluo 1, Xilin 2, Xifu 1, iron walnut (Niangqing folder cotton).