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Phosphorus Transport Pathways to Streams in Tile-Drained Agricultural Watersheds

^a Dep. of Natural Resources and Environmental Sciences, Univ. of Illinois at Urbana-Champaign, 1102 S. Goodwin Ave., Urbana, IL 61801
^b School of Public and Environmental Affairs, Indiana Univ., 1315 E. Tenth St., Bloomington, IL 47405
^c current address, Dep. of Crop and Soil Sciences, Michigan State Univ., 572 Plant and Soil Sciences Bldg., East Lansing, MI 48825

View larger version (34K): [in this window] [in a new window]   Fig.1. Map of east-central Illinois indicating three agricultural watersheds and sampling sites used in the study. Watersheds include: (A) Big Ditch, (B) Lake Fork, and (C) Embarras River; and sites are (1) North Fork of Salt Creek, (2) main stem of Salt Creek, (3) South Branch of Salt Creek, (4) Big Ditch (BDO), (5) unnamed tributary of Big Ditch, (6) Long Creek, (7) Big Creek, (8) Lake Fork (LFK), (9) Black Slough, (10) East Branch of the Embarras River, and (11) Embarras River (EMC).

View larger version (22K): [in this window] [in a new window]   Fig. 2. Stream hydrograph and P concentrations for Embarras River site (EMC) during the 1994 through 2003 water years. TP, total phosphorus; DRP, dissolved reactive phosphorus.

View larger version (19K): [in this window] [in a new window]   Fig. 3. Stream hydrograph and P concentrations for Lake Fork site (LFK) during the 1998 through 2003 water years. TP, total phosphorus; DRP, dissolved reactive phosphorus.

View larger version (17K): [in this window] [in a new window]   Fig. 4. Stream hydrograph and P concentrations for Big Ditch site (BDO) during the 2001 through 2003 water years. TP, total phosphorus; DRP, dissolved reactive phosphorus.

View larger version (16K): [in this window] [in a new window]   Fig. 5. Relationship between discharge and particulate phosphorus (PP) concentrations for three streams in central Illinois. See text for the period of record for each site. EMC, Embarras River site; LFK, Lake Fork site; BDO, Big Ditch site.

View larger version (23K): [in this window] [in a new window]   Fig. 6. Discharge and dissolved reactive phosphorus (DRP) concentrations from two agricultural tile drains in the Embarras River watershed showing three successive rain events during June 1997.

View larger version (16K): [in this window] [in a new window]   Fig. 7. Discharge, particulate phosphorus (PP), and dissolved reactive phosphorus (DRP) concentration from an agricultural tile drain in the Big Ditch watershed showing two successive rain events during June 2002.

View larger version (11K): [in this window] [in a new window]   Fig. 8. Box-and-whisker plots of dissolved reactive phosphorus (DRP) and NH4–N concentrations (log10) from 11 streams throughout central Illinois before and during a rain-on-snow event that occurred 30 Jan. 2001. Horizontal lines in the box indicate the 25th, 50th, and 75th percentiles; the 10th and 90th percentiles are indicated by the whiskers and solid circles indicate concentrations outside of the 10th and 90th percentiles.