- Safety assessment of water resources in Chongqing Section of the Three Gorges Reservoir Area based on DPSIR model from the perspective of agricultural non-point pollution source
- 1. 西南大学资源环境学院, 重庆 400716;
2. 宜春学院经济管理学院, 宜春 336000
- Abstract：The agricultural non-point pollution source has become the major source of river basin pollution in China. It threatens the safety of urban and rural residents' drinking water and has some effects on the sustainable development of our economy. The Three Gorges Reservoir area is frangible ecotope. Therefore, water resource security is especially important for promoting the protection of ecological environment in this area and developing the regional economy. To explore the evolutionary process and inherent mechanism between agricultural nonpoint pollution source and river basin water resource security in Chongqing Section, this paper makes an assessment of river basin water resource security level over the period 2000—2011 by using structural equation model based on DPSIR frame. The results show that the river basin water resources security level can be divided into two stages. During 2000—2005 the water resources safety level was degraded from ‘generally secure' to ‘very unsecure'. However, during 2005—2011 the security level was improved from ‘very unsecure' to ‘secure'. The main cause of these changes is due to the fact that since 2006 the government has realized the importance of ecological environment and strengthened its control over agricultural nonpoint source pollution and soil erosion. Hence, to reduce agricultural nonpoint source pollution and improve river basin water quality, on one hand, the development way of agricultural economy and agricultural structure should be adjusted, depending on science and technology to improve the agricultural product efficiency, reduce the investment of agricultural chemicals and popularize organic agriculture to improve the quality of cultivated land; on the other hand, it is necessary to strengthen the supervision over the water resources, the reservation of water in agricultural production and the investment in the pollution control. By this way, soil erosion and nonpoint source pollution can be effectively controlled and reduced and the sustainable and safe use of river basin water resources can be achieved.
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