|
Figures and Tables from:
"Perspectives on the Land Use History of North America:
A Context for Understanding Our Changing Environment"
Figures
Number
2-1 Population, 1790
2-2 Population, 1850
2-3 Percent of land in farms by county, 1850
2-4 Population, 1860
2-5 Percent of land in farms by county, 1860
2-6 Population, 1900
2-7 Percent of land in farms by county, 1900
2-8 Population, 1950
2-9 Percent of land in farms by county, 1950
2-10 Population, 1990 and percent of land in farms by county, 1992
2-11 Percent of land in farms by coundy, 1982, and 1992
3-1 Nighttime "city lights" image for the continental United States
3-2 Soils map of the united States
3-3 Percent of soil area covered by lights in the United States
3-4 Percent of soil area covered by lights for all 315 soil units for the United States
4-1 A field dominated by kudzu in northern Georgia
4-2 Published floras used to detect changing patterns in species number
4-3 Estimated size of the flora for specific areas in 1900 and 1996
4-4 Estimated proportion of exotic species for specific areas in 1900 and 1996
5-1 Study area for the Baltimore-Washington Regional Collaboratory
5-2 Two hundred years of urban growth for the Baltimore-Washington region
5-3 Simulated forest land cover showing 200 years of urban growth in Baltimore
5-4 Long-term ecological research location map in Baltimore
5-5 Spatial analysis for forest patch map comparison
5-6 Temporal analysis of land cover using 1972 and 1994 photos
5-7 Baltimore region counties' population densities for 1800, 1890, and 1990
6-1 Presettlement and modern forests, and changes in forest types in Great Lakes states
6-2 Changes in area covered by major forest types in the Great lakes states
6-3 The average size of contiguous presettlement and modern forest patches in the Great Lakes states
6-4 Pollen sites in the Great Lakes states
6-5 Scatterplots of squared cord distance values between pollen samples
7-1 Locations of navigation reaches 25 and 26, upper Mississippi River
7-2 Section lines of the U.S. General Land Office surveys permanently etched across the landscape
7-3 Prairie-forest continuum and tree density criteria used to generalize presettlement communitites
7-4 Presettlement land cover along navigation reaches 25 and 26 of the upper Mississippi River
7-5 Contemporary land cover along navigation reaches 25 and 26 of the upper Mississippi River
7-6 Conceptual model of the presettlement upper Mississippi River valley ecosystem
8-1 The Greater Yellowstone Ecosystem
8-2 Time periods examined for studying the natural and human drivers of biodiversity in the Greater Yellowstone Ecosystem
8-3 Strong abiotic gradients in the Greater Yellowstone Ecosystem
8-4 Bird abundance in the Greater Yellowstone Ecosystem
8-5 Bird species richness in the Greater Yellowstone Ecosystem
8-6 Portions of Yellowstone National Park burned by wildfires in 1988
8-7 Stages of lodgepole pine forests after fires
8-8 Past vegetation patterns in the Targhee National Forest
8-9 Remains of a homestead on a productive valley bottom near the Gallatin River
8-10 Frequency distribution of land allocation across elevation classes over the study area
8-11 Landscape patterns imposed by wildfire in Yellowstone National Park
8-12 The Gallatin Valley near Bozeman, Montana
8-13 Change in rural residential development in a portion of Gallatin County, Montana
8-14 New construction in Gallatin County, Montana, 1979-95
8-15 Primary productivity compared with human population density
9-1 Vegetation changes in southwestern landscapes since the end of the last ice age
9-2 Diagram showing fossil packrat midden records of pinyon in the Southwest
9-3 An isolated stand of Colorado pinyon at Owl Canyon in 1950 and 1989
9-4 Creosotebush at the Sevilleta Long-Term Ecological Research site in 1915 and 1989
9-5 Views from Acoma Pueblo to Enchante Mesa in 1899 and 1977
9-6 Photographs of Silver Lake in 1891 and 1982
9-7 The confluence of the west branch of the Santa Cruz River in Tucson, 1904 and 1981
9-8 Changes in montane grassland area between 1935 and 1981 in the Jemez Mountains
9-9 Roads in 1935 and 1981 from aerial photographs of the Bandelier National Monument area
9-10 A tree ring sample showing fire scars
9-11 Fire history study sites in the southwestern United States
9-12 Fire-scar chronologies for different forest sites in 27 southwestern mountain ranges
9-13 A cross-scale comparison of the largest regional fire year (1748) in the Southwest
9-14 Ponderosa pine forest changes
10-1 The Palouse bioregion
10-2 Human population change on the Palouse Prairie
10-3 Percent of total land area in farms through time in three counties
10-4 Changing proportion of the human population living in rural areas
10-5 Rural population and average farm size through time for Whitman County
10-6 Historical and current vegetation in the Palouse bioregion
10-7 Changing vegetation over time of an area near Viola, Idaho
10-8 Past vegetation predicted from soil characteristics for areas in Idaho
10-9 Cropland soil loss due to erosion, 1939-72
Tables
Number
2-1 Large, historically non-farmed or unsustainably-farmed regions in the United States
3-1 U.S. soils grouped by number of physical factors limiting agricultural production
3-2 Results for soils of top-producing agricultural states
5-1 Historical trends of land use and land cover for the Chesapeake region
7-1 Presettlement tree composition within reaches 25 and 26 of the upper Mississippi River
10-1 Changes in species composition since European-American settlement
10-2 Noxious weeds in Latah County, Idaho
Text-only
Privacy Policy and Disclaimers |
Accessibility |
FOIA
http://biology.usgs.gov/luhna/figtab.html
Last Updated: Tuesday, 15-Aug-2000 08:26:50 MDT
|