潜在蒸散(potential evapotranspiration，ETo)既是水分循环的重要组成部分, 也是能量平衡的重要部分，它表示在一定气象条件下水分供应不受限制时, 某一固定下垫面可能达到的最大蒸发蒸腾量，也称为参考作物蒸散。潜在蒸散在地球的大气圈-水圈-生物圈中发挥着重要的作用，与降水共同决定区域干湿状况, 并且是估算生态需水和农业灌溉的关键因子。
在探讨潜在蒸散量计算方法的基础上，计算出孟津县农田潜在蒸散量和土壤含水量；
The paper probes into the methods of calculating the potential evaporation and gives an appropriate method to calculate soil water content and potential evaporation.
以田间实验资料为基础，建立农田蒸散量和土壤相对含水量与潜在蒸散的函数关系。
On the basis of the experimental data in farmland, a function relationship between the potential evapotranspiration and the relative water content of the soil in the root zone was established.
结果表明：从空间分布来看，潜在蒸散量年均和四季从西北到东南基本呈下降趋势。
The results show that: From the spatial distribution, the annual and quarterly potential evapotranspiration from northwest to the southeast of basic have downward trend;
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