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对高、中、低三个不同供水量下的夏玉米蒸腾效率研究结果表明，在强光照下，供水不足引起ＷＵＥ明显下降，而在弱光照下，不同供水量的ＷＵＥ相差不大，灌浆期复水后则差异消失。说明供水不足时ＷＵＥ由供水量和光照共同决定。这是由于在强光照下不同供水量之间Ｐｎ差异很大，Ｔｒ无差异，而在弱光照下，Ｐｎ无差异，Ｔｒ差别明显所致。在强光照下，供水４４５ｍｍ的ＷＵＥ明显高于供水３５０ｍｍ和２８０ｍｍ的ＷＵＥ；在弱光照下，上述三个供水量条件下的ＷＵＥ相近。
The results of summer maize transpiration efficiency under high, medium and low water supply showed that WUE decreased obviously under the condition of high light, while WUE of different water supplied under low light had little difference, Differences disappear after rehydration. Explain that WUE is determined by the amount of water supplied and the amount of light when water is scarce. This is due to the fact that there is a large difference in Pn between different water supplies and no difference in Tr under strong light, but not in Pn under low light conditions. Under bright light, the WUE of 445mm water supply was significantly higher than that of water supply of 350mm and 280mm WUE. Under low light, the WUE of the above three water supply conditions were similar.