In‐Stream Nonpoint Source Nutrient Prediction with Land‐Use Proximity and Seasonality
In‐Stream Nonpoint Source Nutrient Prediction with Land‐Use Proximity and Seasonality
复制标题
具有土地利用邻近性和季节性的流内非点源养分预测
DOI：
10.2134/jeq1998.00472425002700010015x
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
J. Hussey
中科院分区：
文献类型：
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作者：
D. Tufford;H. McKellar;J. Hussey
本研究开发了多元回归模型，土地利用的总氮（TOTN）和总磷（TOTP）在8个，低阶流域的南卡罗来纳州沿海平原的流浓度。研究区（4860平方公里）包括农业，森林，城市和湿地的主要土地利用类别，包括马里恩湖流域的下部。土地使用数据是从通过卫星图像分类得到的现有地理信息系统数据库中获得的。该模型划分土地利用类别，根据距离流通道使用一系列的缓冲区周围的每个流。点源贡献的影响被删除，从观察到的流中浓度，使非点源的影响可以更清楚地描绘。除两个模型外，所有模型在P 150 m）时均具有显著性。土地使用变化情景（将森林和湿地转为农业）支持这样的结论，即以河岸和邻近土地为重点的溪流水质管理将是最有效的。季节模型普遍显着（P < 0.05），并表明，流营养盐浓度的季节分布是依赖于镶嵌在一个特定的subhasin的土地利用。
This research developed multiple regression models relating land use to in-stream concentrations of total nitrogen (TOTN) and total phosphorus (TOTP) in eight, low-order watersheds on the coastal plain of South Carolina. The study area (4860 km 2 ) included dominant land-use categories of agriculture, forest, urban, and wetland comprising the lower portion of the Lake Marion drainage. Land-use data were obtained from a pre-existing GIS database derived by classification of satellite images. The models partitioned land-use categories according to distance from stream channels using a series of buffer zones around each stream. Effects of point source contributions were removed from observed in-stream concentrations so that nonpoint source effects could be more clearly delineated. All models except two were significant at P 150 m). Land-use change scenarios (converting forest and wetland to agriculture) support the conclusion that management of stream water quality will be most effective with emphasis on riparian and adjacent lands. Seasonal models were generally significant (P < 0.05) and demonstrate that the seasonal profile of stream nutrient concentrations is dependent on the mosaic of land uses in a specific subhasin.