The ... Yearbook of AgricultureU.S. Department of Agriculture, 1983 |
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Términos y frases comunes
acid acid rain agement agricultural anadromous animals annual aquifers birds California catfish channel catfish climate coastal costs County coyotes crease crop Douglas-fir duce economic ecosys ecosystems energy environment erosion estry farm farmers Federal feet fish and wildlife flood forage forest land Forest Service forestry grass grasslands grazing ground water ground-water growth habitat hardwood harvest improved inches increase insects irrigation Kirtland's Kirtland's Warbler lakes livestock logs marshes McCabe McHenry County ment million acres mountain National Forests natural resources nesting nutrients occur Ogallala Aquifer percent pest pine Plains pollution ponds population prairie precipitation predators problems production range rangelands recreation reduce region River runoff saline shrubs Soil Conservation sources species stream surface tephra Texas timber tion tional tive trees ture U.S. Forest Service United urban forest USDA vegetation warbler wetlands wild turkey wilderness areas winter wood
Pasajes populares
Página 364 - A wilderness, in contrast with those areas where man and his own works dominate the landscape, is hereby recognized as an area where the earth and its community of life are untrammeled by man, where man himself is a visitor who does not remain.
Página 368 - Act, wilderness areas shall be devoted to the public purposes of recreational, scenic, scientific, educational, conservation, and historical use.
Página 235 - Wetlands are lands transitional between terrestrial and aquatic systems where the water table is usually at or near the surface or the land is covered by shallow water.
Página 158 - The days have ended when the forest may be viewed only as trees and trees viewed only as timber. The soil and the water, the grasses and the shrubs, the fish and the wildlife, and the beauty that is the forest must become integral parts of resource managers' thinking and actions.'7 The NFMA restricted clear-cutting but did not prohibit it.
Página 385 - In order to assure that an increasing population, accompanied by expanding settlement and growing mechanization, does not occupy and modify all areas within the United States and its possessions, leaving no lands designated for preservation and protection in their natural condition, it is hereby declared to be the policy of the Congress to secure for the American people of present and future generations the benefits of an enduring resource of wilderness.
Página 374 - These areas are specially reserved to preserve permanently in an unmodified condition areas representative of the virgin growth of each forest or range type within each forest region so far as they are represented within the National Forests, to the end that its characteristic plant and animal life and soil conditions, the factors influencing its biological complex, shall continue to be available for purposes of science, research and education.
Página 67 - In order to bring out the significant details, let me now change the focus again and take another close look at the experience in Chicago, as shown by the study I have already cited. This study shows that most of the relocated households were longtime residents of the city.
Página 563 - ECOSYSTEM. An interacting natural system including all the component organisms together with the abiotic (non-living) environment.
Página 565 - To facilitate the use and availability of these standards, a composite photograph of these three (3) sediment discs is attached hereto and made a part...
Página 4 - That land is a community is the basic concept of ecology, but that land is to be loved and respected is an extension of ethics.