中文摘要：

蒸发和光合作用二仔细被联系， intercoupled 处理那统治庄稼的生理的活动和收益。因此，有需要学习联合在各种各样的规模当模特儿增加水使用效率(WUE ) 的水碳。夏天在诺思中国把玉米地用作一个例子，在叶的变化和华盖光合作用和蒸发(或土壤水分蒸发蒸腾损失总量) 被分析。光合作用蒸发的合成模型然后在二规模基于有气孔的行为(SMPT-SB ) 被校准并且验证。叶光合作用和蒸发，以及华盖光合作用和土壤水分蒸发蒸腾损失总量，一一致日报趋势。然而，华盖土壤水分蒸发蒸腾损失总量被表层土潮湿内容更影响。在叶光合作用，蒸发，和 WUE 之间的回归系数由 SMPT-SB 估计了，测量价值被发现接近 1，与超过 0.74 的决心的一个系数。在价值的二个集合之间的相对错误是不到 11% 。因此， SMPT-SB 能相当表示井叶光合作用，蒸发，和 WUE。由 SMPT-SB 的估计的华盖规模光合作用也在对测量价值的好同意。然而，当表层土有高潮湿内容因此过高估计时，这个模型低估华盖土壤水分蒸发蒸腾损失总量，到某个程度，华盖 WUE。

英文摘要：

Transpiration and photosynthesis are two closely related and intercoupled processes that dominate the physiological activities and yield of crops. Therefore, there is a need to study water-carbon coupling modeling at various scales to increase water use efficiency （WUE）. Using a summer maize field in North China as an example, the variations in leaf and canopy photosynthesis and transpiration （or evapotranspiration） were analyzed. The synthetic model of photosynthesis-transpiration based on stomatal behavior （SMPT-SB） was then calibrated and validated at the two scales. The leaf photosynthesis and transpiration, as well as the canopy photosynthesis and evapotranspiration, have a consistent diurnal trend. However, the canopy evapotranspiration is affected more by topsoil moisture content. The regression coefficient between leaf photosynthesis, transpiration, and WUE estimated by the SMPT-SB and the measured values was found to approach 1, with a coefficient of determination of more than 0.74. The relative error between the two sets of values is less than 11%. Therefore, the SMPT-SB could express fairly well leaf photosynthesis, transpiration, and WUE. The estimated canopy-scale photosynthesis by the SMPT-SB is also in good agreement with the measured values. However, this model underestimates the canopy evapotranspiration when the topsoil has high moisture content and therefore overestimates, to a certain extent, the canopy WUE.