| 词条 | Eldorado National Forest |
| 释义 |
| name = Eldorado National Forest | photo = Eldorado NF - trail to Winnemucca Lake.jpg | photo_caption = | map = USA | relief = 1 | map_caption = | location = El Dorado, Amador, Alpine, Placer counties, California, and Douglas County, Nevada, United States | nearest_city = Placerville, CA | coordinates = {{coords|38|45|N|120|20|W|region:US|format=dms|display=inline, title}} | area_acre = 596724 | established = July 28, 1910 | visitation_num = | visitation_year = | governing_body = U.S. Forest Service | website = Eldorado National Forest }} Eldorado National Forest is a U.S. National Forest located in the central Sierra Nevada mountain range, in eastern California. GeographyMost of the forest (72.8%) lies in El Dorado County. In descending order of land area the others counties are: Amador, Alpine, and Placer counties in California; and Douglas County in Nevada with {{convert|78|acre|m2}}.[1] The forest is bordered on the north by the Tahoe National Forest, on the east by the Lake Tahoe Basin Management Unit, on the southeast by the Humboldt-Toiyabe National Forest, and to the south by the Stanislaus National Forest. Eldorado National Forest headquarters are located in Placerville, California. There are local ranger district offices in Camino, Georgetown, Pioneer, and Pollock Pines.[2] Land ownershipA complicated ownership pattern exists. The parcels of Other Ownership (private or other Agency land) are mostly isolated and surrounded on all sides by government land. An opposite pattern occurs outside of the Forest Boundary where several small scattered pieces of National Forest lands are separated from the main body and surrounded by lands of Other Ownership.
ElevationsThe Forest ranges in elevation from {{convert|1000|ft}} in the foothills to more than {{convert|10000|ft}} above sea level along the Sierra crest. The mountainous topography is broken by the steep canyons of the Mokelumne, Cosumnes, American, and Rubicon rivers. Plateaus of generally moderate relief are located between these steep canyons. Wilderness areasThe Desolation Wilderness is located within the forest's boundaries, as is most of the Mokelumne Wilderness (which extends into neighboring Stanislaus National Forest and Humboldt-Toiyabe National Forest). ClimateA cool montane version of Mediterranean climate extends over most of the forest with warm, dry summers and cold, wet winters.
Ecology{{Further|Ecology of the Sierra Nevada}}VegetationA wide variety of hardwoods, conifers, shrubs, native grasses, and forbs are represented in the various Eldorado National Forest ecosystems. The principal plant communities found here are:
Sierra Nevada mixed conifer forests
and
LoggingThe major commercial Forest species are White Fir, Red Fir, Ponderosa Pine, Jeffrey pine, Sugar Pine, Douglas Fir, and Incense Cedar. WaterWater is a major resource of the Eldorado National Forest. The forest receives about {{convert|56|in}} of precipitation annually. Average annual runoff is about {{convert|29|in}}. This is equal to an annual water yield of {{convert|2.4|acre.ft|m3|lk=in}} per acre (737,000 m³/km²); therefore National Forest lands yield an estimated {{convert|1,444,000|acre.ft|m3|lk=in}} annually.
TransportationThe Eldorado National Forest has a high density of transportation routes, with {{convert|2367|mi}} of roads, and {{convert|349|mi}} of trails. Roads under Forest Service jurisdiction total {{convert|2158|mi|km}}. There are {{convert|209|mi}} of county roads, and {{convert|400|mi}} of private roads within the National Forest boundaries. HistoryThe forest was established on July 28, 1910 from a portion of Tahoe National Forest and other lands.[4] See also
The forest was formed by the last ice age. References1. ^Table 6 - NFS Acreage by State, Congressional District, and County, 30 September 2008 2. ^USFS Ranger Districts by State 3. ^{{Citation | last1 = Warbington | first1 = Ralph | last2 = Beardsley | first2 = Debby | year = 2002 | title = 2002 Estimates of Old Growth Forests on the 18 National Forests of the Pacific Southwest Region | url = http://www.fs.fed.us/r5/rsl/publications/oldgrowth/oldgrowth2002.html | publisher = United States Forest Service, Pacific Southwest Region}} 4. ^{{cite web|url= http://www.foresthistory.org/ASPNET/places/National%20Forests%20of%20the%20U.S.pdf |title=National Forests of the United States {{small|(341 KB)}}|date=September 29, 2005|author=Davis, Richard C.|publisher=The Forest History Society}} External links{{Commons category}}
9 : National Forests of California|National Forests of Nevada|Protected areas of the Sierra Nevada (U.S.)|Protected areas of El Dorado County, California|Protected areas of Alpine County, California|Protected areas of Amador County, California|Protected areas of Placer County, California|Protected areas of Douglas County, Nevada|Eldorado National Forest |
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