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作 者:许肃[1,2,3] 黄云凤[4] 高兵[1,2,3] 黄葳[1,2,3] 崔胜辉[1,2,3]
机构地区:[1]中国科学院城市环境研究所,城市环境与健康重点实验室,厦门361021 [2]中国科学院大学,北京100049 [3]厦门市城市代谢重点实验室,厦门361021 [4]集美大学食品与生物工程学院,厦门361021
出 处:《生态学报》2016年第22期7279-7287,共9页Acta Ecologica Sinica
基 金:国家科技支撑计划项目(2013BAJ04B01);中国科学院城市环境研究所青年人才领域前沿项目(IUEMS201402);国家自然科学基金项目(31500391)
摘 要:运用物质流分析法,以龙岩市为例,分析了1985—2010年城市食物磷代谢的变化,估算了食物磷足迹。研究表明,龙岩市总磷输入和总磷输出都有明显的增长(总磷输入从4110 t增加到12102 t,总磷输出从3855 t增加到11315 t);总磷足迹从6482t增加到20473 t,直接磷足迹的比例从53%下降到42%;而间接磷足迹的增速明显高于直接磷足迹;龙岩市在城市尺度上是重要的磷汇,在流域尺度上则是重要的磷源。磷足迹的研究有助于全面理解和评估城市磷代谢的特征;将磷足迹与磷流动分析结合,对我国磷资源和区域磷素管理调控具有指导意义。Phosphorus( P) is an irreplaceable and essential nutrient for all living beings and a critical element for food production. However P is not only an essential and irreplaceable non-renewable resource,but also a potential water pollutant which can cause eutrophication. Phosphorus used in fertilizer for food,accounts for approximately 90% of the total phosphorus consumption. China's rapid urbanization calls for a better and comprehensive understanding of P management in urban food systems. In this paper,we firstly present a concept model to map the P metabolism of food production and consumption system. And then we analyzed the change of urban food P metabolism and estimated food P footprint from the year1985 to 2010 based on the method of substance flow analysis and our definition of P footprint,taking Longyan as an example. The result demonstrated that both input P and output P increased significantly( the input P increased from 4110 t to12102 t,the output P from 3855 t to 11315 t); the total P footprint grew up from 6482 t to 20473 t and the proportion of the direct P footprint decreased from 53% to 42%; the growth of the indirect P footprint was faster than that of the direct P footprint. The P metabolism analysis reflected that Longyan was an important P sink at the city scale and main P source at the watershed scale. Our results of P footprint analysis indicated that the indirect P footprint constituted an important proportion of the total P footprint and should not be neglected. The analysis of P footprint helped to comprehensively understand and evaluate characters of urban P metabolism. Combining the analysis of P footprint and substance flow had guiding significance for national and regional P management and regulation.
分 类 号:X24[环境科学与工程—环境科学] F205[经济管理—国民经济]
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