Nitrogen Flow Analysis in Huizhou, South China |
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Authors: | Xiaobo Ma Zhaoyin Wang Zegao Yin Albert Koenig |
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Institution: | (1) College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China;(2) State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China;(3) Department of Engineering, Ocean University of China, Qingdao, 266100, China;(4) Department of Civil Engineering, The University of Hong Kong, Hong Kong, China |
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Abstract: | Eutrophication due to uncontrolled discharges of nitrogen and phosphorus has become a serious pollution problem in many Chinese
rivers. This article analyzes the nitrogen flow in Huizhou City in the East River watershed in south China. The material accounting
method was applied to investigate the nitrogen flows related to human activities, which consist of the natural and anthropogenic
systems. In Huizhou City, the nonpoint source pollution was quantified by the export coefficient method and the domestic discharge
was estimated as the product of per capita nitrogen contribution and population. This research was conducted based on statistical
information and field data from 1998 in the Huizhou City. The results indicated that the major nitrogen flows in this area
were river loads, fertilizer and feedstuff imports, atmospheric deposition, animal manure volatilization, and processes related
to burning and other emissions. In 1998, about 40% of the nitrogen was retained in the system and could result in potential
environmental problems. Nitrogen export was mainly by rivers, which account for about 57% of the total nitrogen exported.
Comparisons made between the East River and the Danube and Yangtze Rivers show that the unit area nitrogen export was of the
same magnitude and the per capita nitrogen export was comparable. |
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Keywords: | Nitrogen flow Material accounting Export coefficient method Huizhou East River Basin |
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