کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4431835 1619898 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Assessment of in-stream phosphorus dynamics in agricultural drainage ditches
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Assessment of in-stream phosphorus dynamics in agricultural drainage ditches
چکیده انگلیسی

The intensive agricultural systems in the Midwestern United States can enrich surface waters with nutrients. Agricultural drainage ditches serve as the first and second order streams throughout much of this region, as well as other highly productive agricultural areas in humid regions throughout the world. This project was conducted to evaluate in-stream processing of soluble P (SP) in agricultural drainage ditches. Soluble P injection studies were conducted at seven sites along three drainage ditches (298 to 4300 ha drainage area), and one site on a third-order stream that receives the discharge from the agricultural ditches (19,000 ha drainage area) by increasing the SP concentration in the ditch water by approximately 0.25 mg L− 1. Sediments collected from smaller watersheds contained greater amounts of Mehlich 3 and exchangeable P (ExP), silt and clay size particles, and organic matter. Phosphorus uptake lengths (Snet) ranged from 40 to 1900 m, and SP uptake rates (U) ranged from 0.4 to 52 mg m− 2 h− 1. Phosphorus Snet was correlated with ditch geomorphological (i.e. width) and sediment properties (i.e. organic matter, ExP, and equilibrium P concentration; r2 = 1.00, P < 0.001), indirect drainage in the watershed (r2 = 0.92, P < 0.001), and the amount of small grains, forest, urban area, alfalfa and corn (r2 = 1.00, P < 0.0001). Agricultural drainage ditches actively process nutrients and could potentially be managed to optimize this processing to minimize SP export from these landscapes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 407, Issue 12, 1 June 2009, Pages 3883–3889
نویسندگان
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