原文传递
Recognizing Wetlands (1998 Edition).
| 题名： | Recognizing Wetlands (1998 Edition). |
| 关键词： | army corps of engineers, soils, vegetation, hydrology, deep water, instructions, indicators, determination, habitats |
| 摘要： | A wetland is an area that is covered by shallow water or has waterlogged soils for long periods during the growing season in most years. Prolonged saturation with water leads to chemical changes in wetland soils, which in turn affect the kinds of plants that can grow in wetlands. Therefore, wetland vegetation often looks quite different from that of surrounding non-wetland areas. Wetlands are known by many different names, some of which are specific to particular regions of the country. Wetlands that are dominated by trees and shrubs are commonly called swamps. Swamp forests associated with rivers and streams in the Southeast are locally known as bottomland hardwoods. Wetlands that consist of herbaceous vegetation, such as sedges, cattails, and bulrushes, are known as marshes. Marshes are highly variable and include fens, sloughs, potholes, and wet meadows. Bogs are generally dominated by sphagnum moss, which, when it dies, builds up in thick layers of peat. Extensive bogs in Canada and Alaska are called muskegs. The information presented here will help you to determine whether you have a wetland on your property. If you intend to place fill material in a wetland or in an area that might be a wetland, contact the local District Office of the U.S. Army Corps of Engineers (Corps) for assistance in determining if a permit is required. / Supplementary Notes: See also ADA176734 and PB89-127914. Sponsored by the U.S. Army Corps of Engineers. Microfiche reproduction is in black and white. / Availability Note: Also available on CD-ROM. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0810；10p |
| 报告类型： | 科技报告 |
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