. An assessment of the forest and range land situation in the United States. Forests and forestry United States; Forest management United States; Rangelands United States. Figure Status of Wetlands in the United States. Alaska Wetlands facing greatest ttireat of drainage y^^Q Waterfowl wintering tiabitat needing protection ^ Destroyed by fiigtiway construction and water facilities Waterfowl breeding fiabitat needing protection A Urban or industrial encroactiment States resulted when the price of wheat accelerated after large sales to the Communist bloc nations in the early 1970's. Riparian
. An assessment of the forest and range land situation in the United States. Forests and forestry United States; Forest management United States; Rangelands United States. Figure Status of Wetlands in the United States. Alaska Wetlands facing greatest ttireat of drainage y^^Q Waterfowl wintering tiabitat needing protection ^ Destroyed by fiigtiway construction and water facilities Waterfowl breeding fiabitat needing protection A Urban or industrial encroactiment States resulted when the price of wheat accelerated after large sales to the Communist bloc nations in the early 1970's. Riparian habitats on rangelands are very suscepti- ble to damage from overgrazing by livestock. Re- moval of tree cover in the understory is of special concern, particularly in the Southwest where this rel- atively limited habitat is vital to the native fauna. Its removal reduces wildlife population levels and uUi- mately the variety of wildlife that can be supported. When riparian lands are grazed too heavily, stream- banks are damaged, movement of sediment into the stream channel is accelerated, stream channels tend to become wider and shallower, and the water becomes warmer. These physical changes may adver- sely affect aquatic organisms. To some degree, down- stream habitats are also affected. Modifications of Aquatic Ecosystems The relative importance of current water-related activities and conditions that have major implications for wildlife and fish is shown by section in table The problems of major concern include reductions in streamflows, physical changes to free-flowing streams and rivers, pollution, and ;* The consumptive use of water for urban, agricul- tural, and industrial purposes and the consequent reductions in streamflows is great enough in some areas to threaten the existence of aquatic organisms. This is particularly true in the Southwest and in the southern portions of the Rocky Mountains and Great Plains. In especially dry years, problem
Size: 1953px × 1280px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1900, booksubjectforestsandforestryunitedstates
