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首页> 外文期刊>Journal of great lakes research >Stream nutrient and agricultural land-use trends from 1971 to 2010 in Lake Ontario tributaries
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Stream nutrient and agricultural land-use trends from 1971 to 2010 in Lake Ontario tributaries

机译：1971年至2010年在安大略湖支流中的营养和农业用地趋势

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Urbanization is generally recognized as the most widespread form of landuse/landcover change (LULC) within populated regions, including southern Ontario, and is often at the expense of surrounding agricultural land. However, changes in agricultural LULC within these peripheral regions should be considered when interpreting water quality changes in watersheds containing mixed LULC The objectives of this study were to first, quantify changes in LULC within twelve Lake Ontario tributaries between 1971 and 2010, and secondly, to determine whether these changes co-occurred with changes in total phosphorus (TP) and nitrate nitrogen (NO3-N) concentrations in streams. Water quality data were obtained from the Ontario Provincial Water Quality Monitoring Network while historical land use was reconstructed from agricultural census reports, historical land cover maps, and modern remotely sensed datasets. Urban cover increased, although percent increases in urban cover were small in the most agriculturally dominated watersheds (3-8%). The area of agriculture declined across all watersheds, yet the proportion of agricultural land dedicated to crop (corn, soybean, and wheat) production increased, including in the most urbanized watersheds (e.g. Mimico 89% urban; 2009-11). Total P concentrations in streams were highest at the urbanized watersheds, particularly in the 1970s, before declining in recent decades. In contrast, NO3-N concentrations were highest (1.5 mg/L; 2000-10) within the most agricultural watersheds (e.g. Gages 71% agriculture) and have increased over the same period of row crop expansion. Further research is needed to determine the mechanisms behind the potential relationship between expanding row crop cover and stream NO3-N concentrations in southern Ontario. (C) 2019 International Association for Great Lakes Research. Published by Elsevier B.V. All rights reserved.
机译：城市化普遍认为，在包括南安大略省在内的人口稠密地区内的土地利用/地中变更（LULC）最广泛形式，通常是为周围农业土地的牺牲品。然而，在解释含有混合LULC的流域的水质变化的情况下，应考虑在这些外围地区的农业水肿内的变化，这项研究的目标是首先，在1971年至2010年间，量化了1971年至2010年间的十二湖Tradaries湖中Lulc的变化，其次确定这些变化是否与流中总磷（TP）和硝酸氮氮（NO 3-N）浓度的变化共同发生。从安大略省水质监测网络获得水质数据，同时从农业人口普查报告，历史陆地覆盖地图和现代远程感知数据集重建历史土地使用。城市掩护增加，虽然城市封面的增加百分比在最农业主导的流域中较小（3-8％）。农业领域在所有流域下降，但致力于作物（玉米，大豆和小麦）产量的农业土地比例增加，包括在最城市化的流域（例如，Mimico 89％的城市; 2009-11）。在近几十年的下降之前，溪流中的溪流中的总浓度最高，特别是在20世纪70年代。相比之下，在最多农业流域（例如，农业71％）中，No3-N浓度最高（> 1.5mg / L; 2000-10），并在相同的行作物扩张时期增加。需要进一步的研究来确定扩张行作物覆盖与南安大略省南部流域潜在关系背后的机制。 （c）2019年大湖泊研究协会。由elsevier b.v出版。保留所有权利。

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