基于DPSR模型的区域水环境承载力评价研究

Evaluation of Regional Water Environment Carrying Capacity Based on DPSR Model

摘要: 针对传统PSR模型难以表征水环境承载力评价中存在的驱动力Driving-压力Pressure-状态State-响应Response (DPSR)逻辑关系的问题，采用水资源驱动、水环境压力、水生态状态和土地生态功能响应的DPSR模型构建区域水环境承载力评价指标体系，用以评估北京市朝阳区2019年水环境承载力。结果表明：2019年朝阳区水环境承载力指数达0.64，属于高承载水平。其中，三产水污染强度指数、城市面源污染强度指数和万元GDP耗水量的贡献率高达85.51%，尤其是城镇生活污水排放强度占比46.72%。由此推测出朝阳区的产业结构以第三产业为主，提高用水效率和加强生活污水处理力度，可显著提高水环境承载力指数。这也说明朝阳区水环境承载力评价结果与《朝阳区分区规划(2017年~2035年)》相吻合，可为北京市水污染防治工作提供科学依据。

Abstract: For the traditional PSR model, it is difficult to express the logic relationship of Driving-Pressure-State- Response (DPSR) in the assessment of water environment carrying capacity (WECC). Thus, aiming at evaluating WECC in Chaoyang District of Beijing in 2019, this study established the DPSR model of the evaluation index system on regional WECC, including water resource driving, water environment pres-sure, water ecological state and land ecological function response. The results showed that Chaoyang District’s WECC index reached 0.64 in 2019, which was a high load carrying level. Meanwhile, the contribution rates of water pollution intensity index of industry-agriculture-life, urban non-point source pollution intensity index and water consumption of 10 thousand RMB Gross domestic product (GDP) were as high as 85.51%, especially the urban sewage discharge intensity accounts for 46.72%. It could be inferred that the industrial structure of Chaoyang District was dominated by tertiary industry. Improving water use efficiency and enhancing sewage treatment could significantly improve the WECC index. These results were consistent with the policy called Chaoyang District Planning (2017~2035), which could provide a scientific basis for water pollution prevention and control in Beijing.