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William Crumpton




Office: 129 Bessey

Phone: 515-294-4752









Department: Ecology, Evolution & Organismal Biology

Research Interests: ecosystem ecology, environmental systems modeling, biogeochemistry, aquatic and wetland ecology

Brief description of current research:

Much of my current research focuses on wetland processes and functions, including the dynamics of energy flow and nutrient transformation in wetlands, the fate and effects of contaminants in wetlands, and the role wetlands in watershed hydrology and water quality. Our work combines experimental studies in wetland mesocosms, field studies in natural and restored wetlands, and dynamic simulation modeling in an effort to understand critical processes and predict wetland performance. Much of my personal effort is directed toward the development and application of performance forecast models for siting, design and assessment of wetland restorations in agricultural watersheds. We have developed and field validated a general model for nitrate loss in wetlands receiving non-point source loads, and have integrated this model in a watershed scale framework for performance forecast modeling of alternative wetland restoration scenarios. This work provided the research foundation for the Iowa Conservation Reservation Enhancement Program, a ten-year, $89 million program using targeted wetland restorations to reduce nitrate loads from tile-drained agricultural watersheds.

Recent publications:

Miller, B. A., W. G. Crumpton, and A. van der Valk, 2009: Spatial distribution of historical wetland classes on the Des Moines Lobe of Iowa. Wetlands, 29, 1146-1153.

Christensen, J. R., W. G. Crumpton, and A. G. van der Valk, 2009: Estimating the breakdown and accumulation of emergent macrophyte litter: a mass balance approach. Wetlands, 29, 204-214.

Miller, B. A., L. Burras, and W. G. Crumpton, 2008: Using soil surveys to map quaternary parent materials and landforms across the Des Moines Lobe of Iowa and Minnesota. Soil Survey Horizons, 49, 83-86.

Iovanna, R., S. Hyberg, and W. Crumpton, 2008: Treatment wetlands: Cost-effective practice for intercepting nitrate before it reaches and adversely impacts surface waters. J. Soil and Water Conservation, 63, 14A-15A.