ESTIMATION OF EVAPOTRANSPIRATION FOR IRRIGATED ARTIFICIAL GRASSLANDS IN TYPICAL STEPPE AREAS USING THE METRIC MODEL
Applied Ecology and Environmental Research
Irrigated artificial grasslands can help in achieving a large amount of forage in the Inner Mongolia typical steppe areas of China. However, developing irrigated artificial grasslands requires the consumption of water resources, and also affects the hydrological cycle. In this study, mapping evapotranspiration at high resolution with internalized calibration (METRIC) model has been used to estimate regional evapotranspiration during the crop growth season (from May to September) in irrigated
... er) in irrigated artificial grasslands in 2011. The results were verified based on the data obtained from eight monitoring points of irrigated silage maize farms using water balance method, with a mean relative error value of 13.8%. The average evapotranspiration for irrigated artificial grasslands during the crop growth season is 611.42 mm. To further analyze the consumption of local water resources, concept of groundwater consumption (GW) is proposed. The GW value for irrigated artificial grasslands during the crop growth season was estimated to be 457.96 mm; the GW values at each of these farms, including Woyuan cow, Maodeng, Baiyinxile, Hezhongmumin, exceeded 400 mm. The results show that these areas, which exhibit high water consumption face difficulties in water resource management, particularly when there is no external water supply.