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The Lake Erie Agricultural Systems for Environmental Quality Project

An Introduction

^a Water Quality Laboratory, Heidelberg College, 310 E. Market Street, Tiffin, OH 44883
^b School of Natural Resources, The Ohio State University, Columbus, OH 43210
^c Department of Geological Sciences, Case Western Reserve University, Cleveland, OH 44106

View larger version (56K): [in a new window]   Fig. 1. The Lake Erie Agricultural Systems for Environmental Quality (LEASEQ) study area includes the watersheds of the Maumee and Sandusky Rivers (shaded), located in northwestern Ohio, northeastern Indiana, and southern Michigan. The circles near the mouths of the rivers indicate the locations of the Water Quality Laboratory sampling stations, at Woodville on the Maumee and at Fremont on the Sandusky. The scale for this map applies also to Figures 2, 3, and 5 through 8.

View larger version (115K): [in a new window]   Fig. 2. Bedrock geology of the Lake Erie Agricultural Systems for Environmental Quality (LEASEQ) study area, based on maps obtained from web sites of the Ohio, Indiana, and Michigan Geological Surveys.

View larger version (101K): [in a new window]   Fig. 3. Surficial geology of the Lake Erie Agricultural Systems for Environmental Quality (LEASEQ) study area, based on maps obtained from web sites of the Ohio, Indiana, and Michigan Geological Surveys.

View larger version (43K): [in a new window]   Fig. 4. Examples of earlier positions of Lake Erie and the glacial ice sheet at various stages of advance and retreat. Modified from Forsyth (1971) and Barnett (1992).

View larger version (78K): [in a new window]   Fig. 5. Physiographic regions of the Lake Erie Agricultural Systems for Environmental Quality (LEASEQ) study area. Based on the Ohio map of Brockman (1998) and the Indiana map of Gray (2000), with reasonable extrapolations into Michigan based on geographic trends and on the Michigan Level III ecosystem map. Unit names shown in the legend are applicable to Ohio only.

View larger version (85K): [in a new window]   Fig. 6. Level IV ecoregions of the Lake Erie Agricultural Systems for Environmental Quality (LEASEQ) study area; Michigan is classified to Level III only. Modified from electronic versions of the maps of Woods et al. (1998) and Omernik (1987).

View larger version (71K): [in a new window]   Fig. 7. General soils of the Ohio portion of the Lake Erie Agricultural Systems for Environmental Quality (LEASEQ) study area.

View larger version (99K): [in a new window]   Fig. 8. Anderson Level I land use classification of the Lake Erie Agricultural Systems for Environmental Quality (LEASEQ) study area. Land use from U.S. Geological Survey Geographic Information Retrieval System data, 1990, scale 1:250000.

View larger version (43K): [in a new window]   Fig. 9. A conceptual framework for the Lake Erie Agricultural Systems for Environmental Quality (LEASEQ) study: An agricultural ecosystem evolving over time.