Measuring Marsh Grass Productivity, by Unknown, 1979, Smithsonian Archives - History Div, Measuring marsh grass productivity in this Plexiglas box. The production of energy in a salt marsh was investigated through a cooperative effort of two Smithsonian bureaus, with the Radiation Biology Laboratory's physiological ecologist Bert Drake and a team of his co-workers conducting research at the Chesapeake Bay Center of Environmental Studies located along the Rhode River estuary of the bay. The two bureaus were merged to become the Smithsonian Environmental Research Center..