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Variations in source apportionments of nutrient load among seasons and hydrological years in a semi-arid watershed: GWLF model results

机译：半干旱流域季节和水文年间养分负荷源分配的变化：GWLF模型结果

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摘要

Quantifying source apportionments of nutrient load and their variations among seasons and hydrological years can provide useful information for watershed nutrient load reduction programs. There are large seasonal and inter-annual variations in nutrient loads and their sources in semi-arid watersheds that have a monsoon climate. The Generalized Watershed Loading Function model was used to simulate monthly nutrient loads from 2004 to 2011 in the Liu River watershed, Northern China. Model results were used to investigate nutrient load contributions from different sources, temporal variations of source apportionments and the differences in the behavior of total nitrogen (TN) and total phosphorus (TP). Examination of source apportionments for different seasons showed that point sources were the main source of TN and TP in the non-flood season, whereas contributions from diffuse sources, such as rural runoff, soil erosion, and urban areas, were much higher in the flood season. Furthermore, results for three typical hydrological years showed that the contribution ratios of nutrient loads from point sources increased as streamflow decreased, while contribution ratios from rural runoff and urban area increased as streamflow increased. Further, there were significant differences between TN and TP sources on different time scales. Our findings suggest that priority actions and management measures should be changed for different time periods and hydrological conditions, and that different strategies should be used to reduce loads of nitrogen and phosphorus effectively.
机译：量化养分负荷的来源分配及其在季节和水文年之间的变化可以为流域养分削减计划提供有用的信息。在季风气候的半干旱流域，养分含量及其来源存在很大的季节性和年际变化。利用广义流域负荷函数模型模拟了中国北方柳江流域2004年至2011年的月营养负荷。模型结果用于调查来自不同来源的养分负荷贡献，源分配的时间变化以及总氮（TN）和总磷（TP）行为的差异。对不同季节的源分配进行的调查表明，在非洪水季节，点源是总氮和总磷的主要来源，而在洪水中，来自农村径流，水土流失和城市地区等分散源的贡献要高得多。季节。此外，在三个典型的水文年中，结果表明，随着径流的减少，点源养分的贡献率增加，而随着径流的增加，农村径流和城市地区的养分贡献率增加。此外，在不同的时间尺度上，TN和TP源之间存在显着差异。我们的发现表明，应针对不同的时间段和水文条件改变优先行动和管理措施，并应采用不同的策略来有效减少氮和磷的负荷。

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