京津走廊麦田蒸散及其与地下水位变化关系研究

The relationship between evapotranspiration in wheat field and the groundwater level in Beijing-Tianjin Corridor

利用区域遥感模型rGIS-ET分析1992年4月至2001年4月京津走廊麦田蒸散及其与地下水位变化结果表明,同一县内麦田蒸散量空间变异明显,10年来麦田耗水呈减少趋势,但由于补给滞缓性等原因地下水位持续下降。且地下水位的季节变化和冬小麦用水密切相关,蒸散量的空间变化可间接反映地下水位采水变化。遥感技术可能为较准确估算小单位地下水用水量提供依据。

By using the regional evapotranspiration （ET） model, rGIS-ET, the relationship between evapotranspiration in wheat field and the ground water level in Beijing-Tianjin Corridor in April from 1992 to 2001 was analyzed. The results show that the spacial variations of ET in a county are significant, the water consumption of wheat field trends to reduce in recent 10years, hut the groundwater level sustainablly decreases because the supply is slowly. The seasonal change of groundwater level is closely related to the water used by winter wheat, the spacial change of ET may indirectly reflect the amount of groundwater.