Evaluation of Point and Diffuse Sources of Nutrients in a River Basin on Base of Monitoring Data
Evaluation of Point and Diffuse Sources of Nutrients in a River Basin on Base of Monitoring Data
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DOI：
10.1007/s10661-006-9376-5
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发表时间：
2007-05
影响因子：
3
通讯作者：
A. Drolc;J. Zagorc Koncan;T. Tišler
中科院分区：
文献类型：
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作者：
A. Drolc;J. Zagorc Koncan;T. Tišler
提出了物质核算的方法，并将其应用于流域养分平衡（氮磷）的研究。该方法基于平衡原理，即平衡各氮磷相关子系统的输入和输出。通过斯洛文尼亚克尔卡河的案例研究说明了方法战略的应用。考虑到排放到地表沃茨的不同途径：污水处理厂排放、直接排放、侵蚀/径流和基流。据估计，每年向Krka河的总排放量为362吨氮/年和73.3吨磷/年。氮的主要来源是扩散源，通过基流排放（52%）。其他重要来源是污水处理厂的废水，占总排放量的36%。其他来源，如侵蚀和直接排放到地表水（动物粪便、工业、家庭）的程度较低。土壤侵蚀是磷的主要排放源，占总排放量的55%，污水处理厂排放的磷占总排放量的37%，其他排放源的贡献较小。除了通过废水收集和实施营养物去除技术减少点源外，管理农业氮和磷以保护水质应成为Krka河流域的一项重大挑战。
The methodology of materials accounting is presented and applied to developing nutrient balance (nitrogen and phosphorus) in a river basin. The method is based on the balance principle: inputs and outputs of each nitrogen and phosphorus related sub-systems were balanced. The application of the methodology strategies was illustrated by means of a case study of the Krka river, Slovenia. Different pathways of emission to surface waters were taken into account: WWTP discharges, direct discharges, erosion/runoff and baseflow. Total annual emission into the river Krka was estimated to be 362 tonnes N/year and 73.3 tonnes P/year. The main sources of nitrogen are diffuse sources, emitted via baseflow (52%). Other important sources are effluents from WWTP, which account for 36% of total emissions. Other sources like erosion and direct discharges to surface water (animal manure, industry, households) are of lower magnitude. Erosion is main source of phosphorus emission (55% of total emission), WWTP effluents account for 37% of total emission, while other sources are less important. Besides reduction of point sources by means of wastewater collection and implementation of nutrient removal technology, managing agricultural nitrogen and phosphorus to protect water quality should become a major challenge in the Krka river basin.