Abstract: Based on the applicability of one-andtwo-layer resistance models, the heat and water vapor transfer over moving dune and farmland in Keerqin desert area is simulated. The calculated fluxes are compared with values measured using Bowen ratio energy balance methods . It is found that the calculated fluxes are in agreement with the measurements. The sensible heat flux, latent heat flux, and the net radiation over moving dune are smaller than those over farmland. This result is attributed to the difference of albedo and hydrothermal characteristics between the two different underlying surfaces. The peak value of latent heat flux appears earlier than that of the sensible heat flux over the moving dune.

Key words: energy balance, resistance model, moving dune, Keerqin desert region

摘要： 在验证单层和双层阻力模式适用性基础上，模拟计算了内蒙古科尔沁地区退化沙地和农耕区两种下垫面的水热交换特征，并与Bowen比能量平衡方法实测结果对比。结果显示：模拟结果与实测结果具有较好的一致性；退化沙地和农耕区下垫面反射率以及下垫面水热特征的差异，造成沙地下垫面感热通量、潜热通量和净辐射均小于农耕区；沙地的潜热通量出现极值的时间较感热通量提前。

关键词: 能量平衡, 阻力模式, 退化沙地, 科尔沁沙地