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首页> 外文期刊>Journal of Hydrology >Different seasonality of nitrate export from an agricultural watershed and an urbanized watershed in Midwestern USA
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Different seasonality of nitrate export from an agricultural watershed and an urbanized watershed in Midwestern USA

机译：美国中西部一个农业流域和一个城市化流域的硝酸盐出口季节不同

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摘要

Land use/land cover is a critical factor affecting temporal dynamics of nitrate export from watersheds. Based on a long-term (>30 years) water quality monitoring program in the Western Lake Erie area, United States, this study compared seasonal variation of nitrate export from an agricultural watershed and an urbanized watershed. A seasonality index was adapted to quantitatively characterize seasonal variation of nitrate export from the two watersheds. Results showed that monthly nitrate concentrations from the two watersheds exhibited different seasonal variation. Seasonality index of monthly nitrate loading for the agricultural watershed is approximately 3 times of that from the urbanized watershed and the difference is statistically significant (p < 0.0001). Meanwhile, calculated historical seasonality indexes of monthly nitrate loading for both watersheds exhibited significant (p < 0.05) decreasing trends according to the non-seasonal Mann-Kendall test. The identified differences in seasonal nitrate export from the two watersheds were mainly attributed to their distinct nitrogen sources, physical and biogeochemical settings. The declining seasonality index of monthly nitrate loading from the agricultural watershed could be partially caused by historical climate change in the study region, especially increased temperature during winter. Urbanization could be one key factor contributing to the declining seasonality index of monthly nitrate loading from the urbanized watershed. Information derived from this study have practical implications for developing proper management practices to mitigate nitrate pollution in Midwestern United States. (C) 2016 Elsevier B.V. All rights reserved.
机译：土地利用/土地覆盖是影响流域硝酸盐输出的时间动态的关键因素。基于美国西伊利湖地区的一项长期（> 30年）水质监测计划，该研究比较了农业流域和城市化流域硝酸盐出口的季节性变化。季节性指数适用于定量表征两个流域硝酸盐出口的季节性变化。结果表明，两个流域的每月硝酸盐浓度表现出不同的季节变化。农业流域每月硝酸盐负载量的季节性指数约为城市化流域的3倍，差异具有统计学意义（p <0.0001）。同时，根据非季节性Mann-Kendall检验，计算得出的两个流域每月硝酸盐负荷的历史季节性指数均显示出显着的下降趋势（p <0.05）。两个流域季节性硝酸盐出口量的差异主要归因于它们不同的氮源，物理和生物地球化学环境。农业流域每月硝酸盐负荷的季节性指数下降可能部分是由于研究区域的历史气候变化，特别是冬季温度升高。城市化可能是导致城市化流域每月硝酸盐负荷季节性指数下降的关键因素。这项研究得出的信息对开发适当的管理实践以减轻美国中西部硝酸盐污染具有实际意义。 （C）2016 Elsevier B.V.保留所有权利。

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