关键词: 物质代谢, 南通市, 输入, 输出

Abstract: A material metabolism analysis is a means of quantifying the burden of environment. Analysis of material metabolism can provide important information about energy efficiency, material cycling,waste management,et al in the chosen region. Given that, the paper studies the overall flows of food,energy,water,material and wastes into and out of the Greater Nangtong Area quantificationally.The most noticeable feature of material metabolism in the Greater Nangtong Area of 1996 and 2002 shows that outputs of solid wastes have generally increased at higher rates than inputs of solid material.The outputs of wastewater have generally increased at lower rates than inputs of fresh water.The speed of metabolism is higher and higher.In 2002,the consumption of material except food (material metabolism,63.34Mt/a) is as 15.8 times as that of food (human metabolism,4.01Mt/a).The consumption of energy in the form of fossil fuel and electricity(energy metabolism,1.93×1014kJ)is as much as 0.48% of all the solar energy(4.0×1016kJ)in the research region,as 17.9 times as that human body needed(body energy metabolism),and as 48.36 times as that fixated by photosynthesis.The trends of material metabolism in the Greater Nangtong Area are escalating,although all kinds of materials and energy have been used more efficiently,and recycling used rates of part of the material and energy are rising,the ecological press on land,waters and atmospheric environment has not been reduced.Finally,the paper puts forward some suggestions (such as establishing a material flow management system)on how to lower down the fragibility of regional metabolism and increase its efficiency in Nantong city.

Key words: material metabolism, Nantong city, inputs, outputs