Characteristics and Influence of Phosphorus Accumulated in the Bed Sediments of a Stream Located in an Agricultural Watershed

被引：43

作者：

Hoffman, Adam R. ^{[1
]}

Armstrong, David E. ^{[1
]}

Lathrop, Richard C. ^{[2
,3
]}

Penn, Michael R. ^{[4
]}

机构：

[1] Univ Wisconsin, Madison, WI 53706 USA

[2] Wisconsin Dept Nat Resources, Madison, WI 53707 USA

[3] Univ Wisconsin, Ctr Limnol, Madison, WI 53706 USA

[4] Univ Wisconsin Platteville, Platteville, WI 53818 USA

来源：

AQUATIC GEOCHEMISTRY | 2009年 / 15卷 / 03期

关键词：

Agricultural watersheds; Bioavailable phosphorus; Phosphorus; Sediment; Equilibrium phosphorus concentrations; ALGAL-AVAILABLE PHOSPHORUS; BIOAVAILABLE PHOSPHORUS; HEADWATER STREAM; LAKE SEDIMENTS; PARTICLE-SIZE; PHOSPHATE; SOILS; IRON; DYNAMICS; WETLANDS;

D O I：

10.1007/s10498-008-9043-2

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

We investigated the accumulation and influence of bioavailable P (BAP) in sediments of a stream located in an agricultural area of the Lake Mendota watershed in Wisconsin, USA. During hydrologic events, the stream carried high concentrations of suspended sediment (up to 250 mg/l) and BAP (up to 2.5 mg/l). Bed sediments were highly enriched in BAP, as inventories of BAP in the top 10 cm of sediment ranged from 143 to 14,500 mu g P/cm(2). Space variations in BAP inventories were related to site-specific hydrodynamics and geochemical factors, including iron (Fe; r (2) = 0.71) and aluminum (Al; r (2) = 0.54) concentrations. Most sites behaved as potential sinks for dissolved reactive phosphate during hydrologic events and potential sources during base-flow periods. Through the combination of site-specific factors and geochemical controls, Dorn Creek modifies the amount, timing, and composition of P delivered from the watershed to downstream sites and water bodies.

引用

页码：371 / 389

页数：19