中文摘要：

陆地水文循环演化过程是开放的、不可逆的能量耗散过程,可以用热力学熵的概念来定量描述。初步给出了水文循环关键要素：降水、土壤入渗、蒸发蒸腾和径流的熵产率的计算方法。计算表明蒸发蒸腾作用对陆地水文循环过程的熵产率影响非常显著,并且蒸发蒸腾能够影响其他要素的熵产率。

英文摘要：

The hydrologic cycle on land surface is open to the exchanges of energy and mass that is characterized by irreversibility and energy dissipation,and thus it can be quantitatively described by the concept of thermodynamic entropy.The calculation method for entropy production rate in the hydrologic cycle is provided by considering the energy and mass exchanges in hydrologic factors：precipitation,soil wetting,evapotranspiration and runoff.The preliminary result suggests that evapotranspiration has the largest contribution to the entropy production rate and it can affect the production rate in other hydrologic factors.