Altered Hydrology of the Missouri River and Its Effects on Floodplain Forest Ecosystems

摘要

A river system's hydrologic regimen, having been altered by the construction and operation of a floodplain protection project, has long been suspected of having major, long-term effects on the natural dynamics of riparian ecosystems that remain in gaps between large reservoirs. This study confirms that hypothesis by documenting some of those impacts in an area between Garrison Dam and Oahe Reservoir on the Missouri River in south-central North Dakota. Specifically, it examines post-dam changes in river meandering rate, floodplain forest composition, tree population structure, and tree growth rate. Results of this study should have application to forests on other floodplains where the natural hydrologic regimen has been altered by man.