Relationship Between Land Use and Evapotranspiration-A Case Study of the Wudaogou Area in Huaihe River basin

Land use has critical influence on evapotranspiration (ET). Winter wheat and bare land are selected to analyze ET in the Wudaogou area in the Huaihe River basin. Firstly Penman-Monteith formula combining crop coefficient was used to calculate the actual evapotranspiration of winter wheat, and a modified Penman Equation was applied to calculate the actual evapotranspiration of bare land. Then the impact of temperature and precipitation on evapotranspiration was evaluated. The results show that maximum monthly mean evapotranspiration of bare land appears different from that of winter wheat. But the monthly mean evapotranspiration of bare land has a similar trend with the winter wheat during the growth period. Based on regression analysis of data, correlation functions between evapotraspiration and temperature, and precipitation have been respectively established for winter wheat and bare land to seek the influence mechanism of evapotranspiration under different land use types.