Art Johnson Organization: University of Pennsylvania, Surficial Processes and Environmental GeologyAffiliations: Surficial Processes and Environmental Geology, University of Pennsylvania Contact Information No contact information available.List of Projects ProjectRoleStartEnd Plant-Available Forest Soil Calcium Reduced by Half from 1930s to 2006 in AdirondacksProject Lead/Principal Investigator 2005-01-01 OngoingDocuments NameDateAuthorsType Seventy-four years of calcium loss from forest soils of the Adirondack Mountains, New York1254110400Art Johnson, James BedisonPublicationA comparison of soil organic matter content in 1932, 1984, and 2005/6 in forests of the Adirondack Mountains, New York1238558400Art Johnson, James BedisonPublicationSeven decades of calcium depletion in organic horizons of Adirondack forest soils1225512000Art Johnson, James BedisonPublicationControls on the spatial patterns of carbon and nitrogen in Adirondack forest soils along a gradient of nitrogen deposition1224216000Art Johnson, James BedisonPublicationTwo decades of change in vegetation in Adirondack spruce-fir, northern hardwood and pine-dominated forests1171947600Art Johnson, James BedisonPublicationUpdated radial growth trends for red spruce in the northern Appalachian and Adirondack Mountains915166800Barry Sims, John Donnelly, Art JohnsonPublication