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本文以两个不同来源的品种为材料，分析了薏苡叶片的大小、叶面积的测定方法及叶面积的变化与组成，结果表明：薏苡叶片的大小因品种和着生部位（叶序）而异，一般中上部叶片较宽大，基部叶较短小；用长宽法测定叶面积的校正系数也因叶序不同而有一定差异，以中上部和基部叶较大，中下部叶较低，两品种的总平均为０．７２７；叶面积（Ｙ）与叶片的长宽乘积（Ｘ１）和长宽比值（Ｘ２）呈极显著正相关，回归方程分别为Ｙ＝－０．２８６＋０．７３０５Ｘ１和Ｙ＝－６．９２８＋４．９２６８Ｘ２；薏苡一生中叶面积的变化呈一元三次曲线，大约在抽穗末期达最大值，一生都处于淹水条件下的单株叶面积和比叶面积均较低；薏苡在中后期分枝分蘖叶面积占全株的比重大，中上部主茎叶面积占主茎叶面积百分比较高
In this paper, two varieties of different sources were used as materials to analyze the size and leaf area of Coix lachryma-jobi, the determination of leaf area and the change and composition of leaf area. The results showed that the size of Coix lachryma-jobi , Generally larger in the upper leaves, the base leaves shorter; correction coefficient by the length and breadth of the leaf area is also different due to leaf order, with the upper middle and base leaves larger, lower middle leaves lower, two varieties The total average was 0.727. The leaf area (Y) was significantly positively correlated with the length-width product (X1) and length-width ratio (X2) of the leaves. The regression equations were Y = -0.286 +0.7305X1 and Y = -6.928 + 4.9268X2. The change of leaf area during the lifetime of Coix lachryma - jobi was a cubic curve of three times, reaching the maximum value at the end of heading stage. The leaf area and specific leaf area per plant were lower under the condition of flooding for a lifetime. Branching tillering leaf area accounted for the proportion of the whole plant, the main stem area in the upper part of the main stem leaf area percentage is high