1 Introduction</h5> Eutrophication is a crucial issue worldwide for environmental water management ( Kuo et al., 2008 ; Leigh et al., 2010 ). In northern China, for example, the Hai River basin is a region of concern because it has become increasingly eutrophied in the past several decades. Eutrophication in this basin has accompanied the economic development and modernization of this region, which has challenged the ecological stability of the watershed system ( Lowery, 1998 ). Water bodies are impacted by anthropogenic disturbances that supply excess nutrients to their systems. Dissolved nitrogen (DN) has significantly impaired water quality and is thus seen as a major target for load reduction ( Ferreira et al., 2007 ; Chen et al., 2011 ). Nonpoint sources of DN loads have only recently received attention in China and have become a serious concern ( Zhang and Wen, 2008 ; Ongley et al., 2010 ).</P>Unlike the direct discharge of point sources, the diffuse nature of nonpoint sources makes their identification more difficult. Nonpoint source loads are characteristically indirect, are multiple and dynamic in nature, and are closely correlated with hydrological processes at the watershed scale ( Loague et al., 1998 ; Zhang et al.,
Journal of Environmental Management – Elsevier
Published: Jul 30, 2013
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