中文摘要：

研究运用物质流分析方法,构建基于物质代谢过程的城市食物生产与消费系统磷代谢分析框架,即追踪以＂食物生产＂、＂食物加工＂、＂居民消费＂、＂废物处置＂为主要过程的磷代谢路径,解析磷代谢主要过程机制并提出相应的核算方法;在此基础上,以合肥市食物生产与消费系统为例进行了案例研究.结果表明,2008年合肥市食物生产消费系统磷的总需求量为5 475.86 t,其中出口到系统外含磷总量为242.57 t,进入地表水体的磷负荷为1 710.84 t,其余磷以存量形式留存于系统中.农田化肥流失与生活废污排放是导致水体磷负荷过大的主要原因.据此,针对磷代谢系统的总体结构特征,从农业种植、城乡消费、环境基础设施建设和畜禽养殖等方面提出若干优化磷代谢过程和减少磷排放的对策建议.

英文摘要：

With the method of substance flow analysis（SFA）,the study provided an analytical framework for phosphorus cycle on civil food production and consumption system that was demonstrated by four life stages-food production,food processing,consumption and waste handling.Furthermore,a case study was carried out in Hefei City,for the year 2008.The SFA results show that the total demand of phosphorus reaches 5 475.86 t in the food production and consumption of Hefei City in 2008;approximately 242.57 t P leaves the system,and around 1 710.84 t P is emitted via waste discharge to the surface water,the rest is transformed as the stocks in the system.The effluent of excessive fertilizer in agriculture plays an important role for the huge phosphorus load,as well as the civil sewage.In the end,the study provided some suggestions on improving the use efficiency of phosphorus and reducing phosphorus discharge into surface water.