The Effect Of Large Scale Crop Production Upon Ground Water In The Northern Region: A Case Study Of The Luohui Ditch Irrigation District

Ground water is not only the primary component of water resource, but also the important water resource for water supply in the northern region. So the exploitation of ground water is connected with the sustainable development of society economy and the sustainable utilization of ground water. Aiming at the problems of the ground water table's continual decline in the Irrigation District, the effect of the crop production upon ground water table and consumption of ground water is studied in this paper, and the ground water table is predicted by Grey Model and Regression Model. The research results will be the direction for the Irrigation District to regulate crop planting structure, and use ground water reasonably. The main conclusions are listed as follows:1. According to the actual meteorologic data in the Irrigation District, crop potential water requirement, based on the analysis of the calculation measures of ecumenical crop water requirement, is calculated by Penman formula in this paper. The crop water requirement and its rule on different frequency of rainfall are analyzed in the paper, and the crop water requirement is indirectly predicted by the Grey Disaster Model of rainfall.2. Based on the pertinence analysis of the data of the water diversion of the canal head, rainfall, water from River Luo, water of well irrigation, irrigation area, the conclusion is obtained that the water diversion of canal head is preferable pertinence with rainfall. Themodel of the water diversion of canal head and rainfall can be founded by the Grey Model-GM (1,2), and water diversion of canal head is predicted by this model.3. The consumption of ground water for crop production is calculated on the basis of field water balance. The Regression Model of ground water table and the accumulation of consumption of ground water is established. The ground water table in the future is imitated and predicted by the model. Combined with the prediction result of the ground water table, the effect of crop production upon ground water is analyzed, and some measures must be adopted to ensure sustainable utilization of ground water resource.