Adaptation between irrigation intensity and groundwater carrying capacity in North China Plain

Abstract: According to the problems of the water resources shortage and the serious overexploitation of the groundwater for the agricultural irrigation in the North China Plain, the evaluation index system and the evaluation method for the adaptability between agricultural irrigation and groundwater carrying capacity were established. Taken the irrigation use water situation of the wheat crops, the corn crops, the vegetable crop and the consumption fruit trees as the main research object, the earth science module concept, equilibrium theory and MapGIS technology were used. The precipitation, water resources and agricultural irrigation situation since 1978 obtained were obtained by field investigation, collection and analysis. Evaluation results in the resolution of 0.49 square kilometers can identify adaptation of the water use intensity for agricultural irrigation and the carrying capacity of groundwater resources. Research results show that the most of the middle of the North China Plain are in agricultural irrigation water intensity state of "very serious incommensurate"; the piedmont plain of northwest, southwest near the Yellow River area in "balanced" or "general does not adapt"; the main agricultural production area of the Hebei plain in "extremely serious incommensurate", where is in the overdraft situation of the groundwater. The irrigation intensity of the wheat and other grain crops in the summer occupies 50% of the annual irrigation water use or more, the irrigation intensity ratio of the corn and other grain crops in the autumn accounted for from 10% to 30% and the irrigation intensity ratio of the vegetable crops and the fruit trees were significantly increased. In the groundwater overdraft area, irrigation intensity is over 20%. Therefore, water-saving measures should be taken to avoid continuous increase of water use for the vegetable crop planting.