关键词: 物质流分析, 房屋建筑, 钢铁存量, 时空变化, 中国

Abstract:

At present, the construction industry is China’s largest iron consumption sector. Understanding the stock of iron in construction helps to accurately grasp the utilization of iron resources in construction and provide support for the management and recycling of iron resources. This study implemented dynamic material flow analysis combined with life cycle distribution function to quantitatively analyze the usage and recycling of iron in buildings, which was based the stock of iron in China's housing construction from 1949 to 2016. The results show that with three periods of quiet growth period, slow growth period, and rapid growth period, the iron stock in China's housing construction increased from 100 000 tons in 1949 to 2.81 billion tons in 2016. The per capita iron stock in housing construction also increased from 0.2 kg per capita to 2029 kg per capita in China. Both of above are still in a period of rapid growth stage. There is a great potential for iron recovery in housing construction in the future. Due to the impact of industrialization and urbanization, the per capita iron stocks in housing construction of the four major economic regions are significantly different in China. In 2016, the largest iron stock per capita in housing construction in the eastern region was 2526 kg per capita, followed by 2128 kg per capita in the northeast region, 1732 kg per capita in the central region, and 1605 kg per capita in the western region. Affected by differences in the living environment and economic level of urban and rural areas, the per capita iron stock in China's urban and rural areas are significantly different. In 2016, the per capita iron stock of urban residents in China's housing construction reached 3145 kg per capita. However, this number was 530 kg per capita in rural areas.

Key words: material flow analysis, housing construction, iron stock, Temporal and spatial changes, China