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研究了６个品种（系）的对生和互生玉米的叶面积分布、蒸腾速率（Ｔ_ｒ）和水分利用率（ＷＵＥ）。 结果表明，对生玉米单株叶数和叶面积比互生玉米分别高出１９２％～２２０％和１３０％～１９０％。两者的不 同叶位与叶面积之间均呈极显著的二次抛物线回归关系，即判断得最大叶面积的叶位数为６。后期（灌 浆期起），对生玉米叶绿素含量高于互生的，差异显著。在睛天，对生和互生玉米的Ｔ_ｒ、气孔导度（Ｇ_ｓ） 以中午前后最高，其日变化与光量子通量密度（ＰＦＤ）、叶温（Ｔ_１）、叶片一大气之间的水蒸气压亏缺 （ＶＰＤ）等因子显著相关，ＰＦＤ对Ｔ_ｒ、Ｇ_ｓ影响较明显。对生玉米Ｔ_ｒ和Ｇ_ｓ低于互生的，两者之间的净光 合速率（Ｐ_ｎ）差异不显著，对生玉米的ＷＵＥ高于互生的，差异显著。表明对生比玉生玉米对干旱条件 的适应性较强。
The leaf area distribution, transpiration rate (T_r) and water use efficiency (WUE) of six different varieties (lines) were studied. The results showed that the number of leaves per plant and leaf area per plant were 192% ~ 220% and 130% ~ 190% higher than that of the corresponding maize. There was an extremely significant quadratic parabolic regression relationship between different leaf positions and leaf areas, ie, the maximum number of leaf positions judged to be 6. Late (from the filling stage), the chlorophyll content of raw corn is higher than the other, the difference was significant. On daylight, T_r and stomatal conductance (G_s) of maize and alternate maize were the highest at noon, and the diurnal variation was positively correlated with the light flux density (PFD), leaf temperature (T_1) and water vapor pressure (VPD) and other factors were significantly related to PFD on T_r, G_s more obvious. There was no significant difference in net photosynthetic rate (P_n) between T_r and G_s and the WUE of live corn, which was significantly different from each other. The results showed that maize was more adaptable to drought conditions than maize.