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Nitrogen Flow Analysis in Huizhou, South China

机译：华南惠州的氮流分析

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摘要

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.
机译：在许多中国河流中，由于无法控制的氮和磷排放而引起的富营养化已成为严重的污染问题。本文分析了华南东部河流域惠州市的氮流量。物质核算方法被用于调查与人类活动有关的氮流量，其中包括自然和人为系统。在惠州市，通过出口系数法对面源污染进行了定量分析，并以人均氮贡献量和人口数的乘积估算了家庭排放量。这项研究是基于1998年惠州市的统计信息和现场数据进行的。结果表明，该地区的主要氮流量是河流负荷，肥料和饲料的进口，大气沉积，动物粪便的挥发以及与燃烧和其他排放有关的过程。 1998年，系统中保留了约40％的氮，这可能会导致潜在的环境问题。氮出口主要通过河流，约占氮出口总量的57％。东河与多瑙河和长江的比较表明，单位面积的氮出口量相同，人均氮出口量可比。

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