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National Resources Inventory
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Key Findings
Cropland and Forest Land Gains and Losses Tables
Importance to the NationLand use is surprisingly dynamic, with annual shifts in and out of different uses. Examining net change in land use reveals general trends, but masks the real extent of land use change over time. In agriculture there are frequent shifts in the use of land among cropland, pastureland, rangeland, and forest land. Each time land changes use it may affect erosion potential, contiguity of habitat, or hydrologic features of the landscape. Cropland, pastureland, rangeland, and forest land comprise the majority of the Nation’s land resources and thus:
More InformationFor more information about the NRI, visit http://www.nrcs.usda.gov/technical/NRI/ See the 2001 NRI Glossary for definitions of key terms. To obtain State and local 1997 NRI data, contact your NRI coordinator. Links to State NRI websites and contact information can be found at: http://www.nrcs.usda.gov/technical/NRI/1997/obtain_data.html Send comments and questions to nri@nhq.nrcs.usda.gov |
About the DataEstimates presented here are based upon the latest information from the National Resources Inventory (NRI). The NRI is a longitudinal sample survey based upon scientific statistical principles and procedures. It is conducted by the U.S. Department of Agriculture’s Natural Resources Conservation Service (NRCS), in cooperation with Iowa State University’s Center for Survey Statistics and Methodology. The results are the first available from the new Annual NRI. Previously, NRI data were collected at 800,000 sample sites every 5 years. Now the data are collected every year, but for slightly less than 25 percent of these same sample sites. The 2001 data are suitable only for analysis at a national scale because of this reduced sample size. As additional data are collected each year, results will become available for regional, state, and sub-state analysis. Current estimates cover the contiguous 48 states. Future estimates will also cover Hawaii, Alaska, the Caribbean, and selected Pacific Basin islands. The findings on land use come from the NRI data category “Land Cover/Use,” which comprises mutually exclusive categories such as cropland, rangeland, forest land, other rural land, developed land, and water areas. The NRI uses this classification to account for each and every acre of nonfederal land within the Nation. Every parcel of land is described by one and only one of these categories. The NRI approach to conducting inventories facilitates examining trends in rural and developed land uses over time because –
Irrespective of the scale of analysis, margins of error must be considered. Margins of error are presented for all NRI estimates. |
Year | Cropland | CRP Land | Pastureland | Rangeland | Forest Land | Other Rural Land | Developed Land | Water Areas | Federal Land |
---|---|---|---|---|---|---|---|---|---|
1982 | 420.4 ± 2.0 |
0 * | 131.4 ± 1.3 |
414.5 ± 4.3 |
402.6 ± 2.3 |
48.3 ± 1.3 |
72.8 ± 0.7 |
48.6 | 399.1 |
1987 | 406.2 ± 2.0 |
13.8 | 127.2 ± 1.2 |
409.3 ± 4.3 |
404.4 ± 2.3 |
48.6 ± 1.3 |
79.0 ± 0.8 |
49.8 | 399.4 |
1992 | 381.6 ± 2.0 |
34.0 | 125.4 ± 1.2 |
405.9 ± 4.3 |
403.6 ± 2.3 |
49.8 ± 1.3 |
86.5 ± 0.8 |
49.4 | 401.5 |
1997 | 376.4 ± 2.0 |
32.7 | 119.5 ± 1.2 |
404.9 ± 4.3 |
404.7 ± 2.3 |
50.3 ± 1.3 |
97.6 ± 0.9 |
49.9 | 401.7 |
2001 | 369.6 ± 2.3 |
31.8 | 116.9 ± 1.7 |
404.7 ± 4.4 |
404.9 ± 2.5 |
51.4 ± 1.5 |
106.3 ± 1.1 |
50.3 | 401.8 |
* CRP was not implemented until 1985.
Total surface area of the contiguous United States is 1,937.7 million acres
Year | Cropland | Pastureland | Forest Land |
All Other Land Uses |
Total |
---|---|---|---|---|---|
1982 | 231.5 ± 3.4 |
37.7 ± 1.4 |
46.9 ± 1.7 |
26.0 ± 1.3 |
342.1 ± 4.0 |
1987 | 226.8 ± 3.4 |
37.1 ± 1.4 |
47.2 ± 1.7 |
28.7 ± 1.3 |
339.8 ± 4.0 |
1992 | 217.0 ± 3.3 |
37.2 ± 1.4 |
47.6 ± 1.7 |
34.7 ± 1.3 |
336.5 ± 4.0 |
1997 | 213.5 ± 3.3 |
35.4 ± 1.4 |
48.8 ± 1.7 |
34.9 ± 1.3 |
332.6 ± 4.0 |
2001 | 209.4 ± 3.3 |
35.1 ± 1.4 |
50.0 ± 1.7 |
35.1 ± 1.3 |
329.6 ± 4.0 |
Year | Cultivated Cropland | Noncultivated Cropland | Total Cropland |
---|---|---|---|
1982 | 376.0 ± 1.9 |
44.4 ± 0.8 |
420.4 ± 2.0 |
1987 | 362.8 ± 1.9 |
43.4 ± 0.8 |
406.2 ± 2.0 |
1992 | 334.2 ± 1.9 |
47.4 ± 0.8 |
381.6 ± 2.0 |
1997 | 326.4 ± 1.8 |
50.0 ± 0.9 |
376.4 ± 2.0 |
2001 | 315.0 ± 1.8 |
54.6 ± 1.0 |
369.6 ± 2.3 |
Year | Pastureland | Rangeland | Grazed Forest Land | Total Grazing Land |
---|---|---|---|---|
1982 | 131.4 ± 1.3 |
414.5 ± 4.3 |
65.1 ± 1.7 |
611.0 ± 4.6 |
1987 | 127.2 ± 1.2 |
409.3 ± 4.3 |
62.7 ± 1.7 |
599.2 ± 4.6 |
1992 | 125.4 ± 1.2 |
405.9 ± 4.3 |
61.4 ± 1.7 |
592.7 ± 4.6 |
1997 | 119.5 ± 1.2 |
404.9 ± 4.3 |
58.2 ± 1.8 |
582.6 ± 4.6 |
2001 | 116.9 ± 1.7 |
404.7 ± 4.4 |
55.7 ± 1.9 |
577.3 ± 4.8 |
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