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Modeling nutrient sources, transport and management strategies in a coastal watershed, Southeast China

机译：中国东南沿海流域的养分来源，运输和管理策略建模

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摘要

Integrated watershed management requires an analytical model capable of revealing the full range of impacts that would be caused by the uses and developments in the watershed. The SPAtially Referenced Regressions On Watershed Attributes (SPARROW) model was developed in this study to provide empirical estimates of the sources, transport of total nitrogen (TN) and total phosphorus (TP) and to develop nutrient management strategies in the Jiulong River Watershed, southeast China that has enormous influence on the region's ecological safety. We calibrated the model using data related to daily streamflow, monthly TN and TP concentrations in 2014 at 30 locations. The model produced R2 values for TN with 0.95 and TP with 0.94. It was found that for the entire watershed, TN came from fertilizer application (43%), livestock breeding (39%) and sewage discharge (18%), while TP came from livestock breeding (46%), fertilizer application (46%), and industrial discharge (8%). Fifty-eight percent of the TN and 80% of the TP in upstream reaches are delivered to the outlets of North and West rivers. A scenario analysis with SPARROW was coupled to develop suitable management strategies. Results revealed that controlling nutrient sources was effective in improving water quality. Normally sharp reduction in nutrient sources is not operational feasible. Hence, it is recommended that preventing nutrient on land from entering into the river as a suitable strategy in watershed management.
机译：流域综合管理需要一个分析模型，该模型能够揭示由流域的使用和开发引起的全部影响。本研究开发了空间参考的流域属性回归模型（SPARROW），以提供源，总氮（TN）和总磷（TP）的来源，实证估算并制定九龙东南流域的养分管理策略中国对该地区的生态安全影响巨大。我们使用2014年在30个地点的每日流量，TN和TP浓度相关的数据对模型进行了校准。该模型得出的TN的R2值为0.95，TP的R2值为0.94。研究发现，在整个流域，总氮来自化肥施用（43％），畜牧业（39％）和污水排放（18％），而总磷来自畜牧业（46％），化肥（46％） ，以及工业排放（8％）。上游河道中有58％的总氮和80％的总磷被输送到北部和西部河流的出口。结合使用SPARROW进行的情景分析来制定合适的管理策略。结果表明，控制营养源可有效改善水质。通常，急剧减少营养源是不可行的。因此，建议在流域管理中作为一项适当的策略来防止陆地上的养分进入河流。

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