Agriculture is an important industry in the Yangtze River Delta.Agricultural non-point source pollution has brought severe challenges to water security,food security,and ecological safety in the Yangtze River Delta;therefore,it is urgent to synergistically manage agricultural non-point source pollution through co-governance of water resource protection,water pollution control,and aquatic ecosystem restoration,thereby safeguarding the high-quality and integrated development of the Yangtze River Delta.This study systematically analyzes the challenges faced in the management of agricultural non-point source pollution in the region:large agricultural water consumption and low recycling rate;complex composition of agricultural non-point source pollution and variable production and transportation process;mutual interaction of regional planting and breeding with superimposed pollution emissions;lack of coordination between water quality improvement,water quantity,and aquatic ecosystem;unclear responsibility of non-point source pollution governance entities;and difficulties in long-term operation and maintenance of engineering projects.The study proposes the following suggestions for the system construction aimed at synergistic governance of agricultural non-point source pollution in the Yangtze River Delta:(1) constructing a regional circular wetland system for farmland to facilitate the recycling of water,fertilizer,and pesticides;(2) leveraging irrigation and drainage systems to realize stepwise interception and purification of farmland pollutants;(3) coordinating the integrated use of water and fertilizer for planting and breeding to achieve near-zero emission of non-point source pollutants;(4) integrating the governance of water resource protection,water pollution control,and aquatic ecosystem restoration to establish technical standards and management paradigms;and (5) establishing a platform for co-governance to enhance the comprehensive control system for water resources,environment,and ecology in the Yangtze River Delta.
关键词
长江三角洲/农业面源污染/"三水"共治/水肥循环利用/逐级截留净化
Key words
Yangtze River Delta/agricultural non-point source pollution/coordination of water resources,environment,and ecology/water and fertilizer recycling/stepwise interception and purification
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