Less expensive and more environmentally appropriate than conventional engineering approaches, constructed ecosystems are a promising technology for environmental problem solving. Undergraduates, graduate students, and working professionals need an introductory text that details the biology and ecology of this rapidly developing discipline, known as ecological engineering. Ecological Engineering: Principles and Practice fills this need by describing ecological concepts and theory and demonstrating their application to constructed ecosystems. It presents highly visible and widespread applications of ecological engineering, including treatment wetlands, microcosms, composting systems, restoration ecology, soil bioengineering, and invasive species control.