Appalachian temperate rainforest
Appalachian temperate rainforest | |
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humid continental (Dfb)[6] |
The Appalachian temperate rainforest or Appalachian cloud forest is located in the southern
Due to variable
Humans have shaped the rainforest environment for the last 12,000 years through activities such as hunting and agriculture.
Climate
The Appalachian temperate rainforest has a cool and mild climate and meets the criteria of temperate rainforests identified by Alaback.[1] Temperature and precipitation are extremely variable with elevation, with rainforest conditions usually but not always concentrated around spruce–fir forests at higher elevations.[2][22] These spruce–fir forests have an annual mean temperature of 6.5 °C (43.7 °F) and a growing season mean (May–September) of 13.5 °C (56.3 °F), though this is likely somewhat cooler than the average across the entire rainforest ecosystem.[2] It has annual precipitation above 140 centimetres (55 in), a cool summer, typical transient snow in winter, mean annual temperature near 7 °C (45 °F), and summer rainfall is above 10% of overall precipitation, classifying it as a perhumid temperate rainforest.[1][2]
Annual precipitation varies significantly within the mountainous terrain, with the highest precipitation in southwest North Carolina and the lowest near
In addition to the increased precipitation from orographic lift, cloud cover keeps the rate of water loss low due to minimal
Ecology
High precipitation levels, moderate year-round temperatures, and diverse terrain enable a wide range of species to survive.
Flora
In addition to over 100 species of native trees, 1,400 other flowering plants and 500 moss and fern species call the rainforest home.
Fauna
With 30 identified species, the rainforest is home to the highest diversity of salamanders in the world.
Larger animals include the
Funga
The wet montane environment supports one of the world's highest diversities of fungi including
History
The Appalachian Mountains began to form 460 million years ago with the collision of
Pre-colonial
Around 12,000 years ago,
Cultural developments accelerated with the adoption of agriculture in the highlands in the
Colonial
Following
Roads were quickly built, and by the early 1800s the US had full control of the region.[16] While valleys were farmed intensively, land use changed little in high-elevations, though European livestock were introduced.[16] Similarly, most industry remained agricultural prior to the 1880s, though some logging and small-scale gold and copper mining began.[16][19] During this period, bounties on predators drove them to near-extinction, bison and elk were extirpated, and trapping decimated fur-yielding species.[16] Moreover, the vast majority of the Cherokee Nation were forced to move from their traditional homeland to Oklahoma during the Trail of Tears.[35] However, about 9,000 members of the tribe continue to live inside the Qualla Boundary, which lies within the rainforest biome.[16][35]
By the 1880s, Appalachia's natural resources had drawn the attention of industrialist Civil War veterans and vacationers from the North, buying up land and dramatically expanding the nascent railway system.[16][19] While Appalachia is famous for its coal, mica mining was far more dominant in rainforested areas, and logging remained generally confined to the valleys along significant rail lines.[16] However, as outside investors bought up growing tracts of land and Appalachia's railroad system matured, increasing swathes of forest were cleared.[16][19] By the 1900s and 1910s, even the spruce-fir forests of Mount Mitchell—the highest peak in the Appalachian Mountains—had begun being logged.[16][19]
The early 1900s were devastating for the rainforest landscape. Wolves, beavers, and mountain lions vanished; bear, turkey, and deer populations plummeted; and exotic
Threats
Fire
Wildfires are a natural ecological process that has occurred within the Appalachian temperate rainforest for millennia.
Pollution and climate change
High peaks in the temperate rainforest have some of the highest air pollution of any region in the Eastern United States, with a 1999 study finding
Similarly, anthropogenic climate change will have numerous and varied impacts in the rainforest, which may be difficult to predict. These impacts will likely be felt in the relict high elevation spruce-fir forests that heavily rely on cold temperatures and near-constant fog.[8] Any change in cloud patterns or height could significantly disrupt the cloud-based deposition this forest type relies on for up to 50% of their water budget, forcing them upslope until extirpation.[8][21] However, it has been hpothesized that higher elevations may be more resistant to climactic change.[21] Similarly, climate change is predicted to increase the rate of wildfires and place more stress on existing forests, leading them more susceptible to current threats.[21]
Invasive species
Invasive species pose a significant risk to the landscape of the Appalachian temperate rainforest, with two major introduction events in living memory. First, the chestnut blight emerged in Appalachia in the early 20th century, decimating American chestnut trees, a dominant species in the region.[18] Originally a fungal pathogen introduced from Asia, the blight quickly spread, wiping out vast populations of mature chestnuts and dramatically altering the composition of forests across the Eastern US.[18] While the trees once made up as much as 25% of hardwood forest stands, the American chestnut is now critically endangered and largely extirpated from its natural range.[18]
Similarly, the balsam woolly adelgid was introduced from Europe in the 20th century and devastated fraser fir stands on the rainforest's mountaintops. First discovered on Mount Mitchell in 1957, it quickly spread to all fir populations.[17] Fir mortality in Appalachia rose one-hundred-sixtyfold by 1970, eventually killing two-thirds of adult trees.[17][18] Initial efforts to control the adelgid largely failed, complicating repopulation efforts.[18] Though there are signs of recovery in recent years—such as Clingmans Dome having three times more adult trees in 2020 than in the 1980s[18]—these threats to the forest are not independent and scientists warn climate change may lead to another adelgid outbreak. "If we were to have a period of warm winters and hot, dry summers, the trees will be stressed, I wouldn’t be surprised to see a resurgence of balsam woolly adelgid," says Kristine Johnson, supervisory forester at the Great Smoky Mountains National Park.[18]
See also
- Appalachian-Blue Ridge forests
- Southern Appalachian spruce–fir forest
- Cove (Appalachian Mountains) § Cove forest
Notes
- ^ Areas in green on the map exhibit high annual rainfall (at least 1400 mm), cool year-round temperatures (4 to 12°C average) wet summers (at least 10% of total precipitation occurring during the summer months), and moderate July temperatures (dark green less than 16°C, medium green less than 18°C, light green less than 20°C). While only the darkest green meets Alaback's original 1991 definition of a temperate rainforest,[1] the July temperature limits of this definition have since been broadened by a 2011 book by DellaSala, Alaback, and others.[2] Map created in ArcGIS Pro using open-access historical climate data at 30 arcsecond resolution.[3]
References
- ^ a b c Paul B. Alaback (1991). "Comparative ecology of temperate rainforests of the americas along analogous climatic gradients" (PDF). Revista Chilena de Historia Natural. 64: 399–413.
- ^ a b c d e f g DellaSala, Dominick A. Temperate and Boreal Rainforests of the World: Ecology and Conservation. Washington, DC: Island, 2011. Print.
- ^ "Historical Climate Data". WorldClim. Retrieved January 7, 2024.
- ^ "Great Smoky Mountains Birds". National Park Service. Retrieved February 23, 2024.
- ^ a b c d e f g h i j k l m n o p "Great Smoky Mountains Nature & Science". National Park Service. Retrieved February 23, 2024.
- ^ H. E. Beck; T. R. McVicar; N. Vergopolan; A. Berg; N. J. Lutsko; A. Dufour; Z. Zeng; X. Jiang; A. I. J. M. van Dijk; D. G. Miralles (2023). "High-resolution (1 km) Köppen-Geiger maps for 1901–2099 based on constrained CMIP6 projections". National Weather Digest. 10. Scientific Data: 724.
- ^ a b c d e f g h i j k l m n o p q r "Biodiversity of Highlands". Highlands Biological Station. Retrieved February 22, 2024.
- ^ a b c d e f g h "Leaf Gas Exchange of Understory Spruce–fir Saplings in Relict Cloud Forests, Southern Appalachian Mountains, USA." Reinhardt, Keith, and William K. Smith. Tree Physiology 28 (2007): 113-22.
- ^ "Weather". Great Smoky Mountains National Park. Retrieved November 2, 2023.
- ^ a b David M. Gaffin; David G. Hotz (2000). "A Precipitation and Flood Climatology with Synoptic Features of Heavy Rainfall across the Southern Appalachian Mountains" (PDF). National Weather Digest. 24 (3). National Weather Digest: 3–15.
- ^ a b c "Geologic Provinces of the United States: Appalachian Highlands Province." Archived 2013-03-11 at the Wayback Machine USGS Geology in the Parks. N.p., 13 Jan. 2004. Web. 1 Oct. 2013.
- ^ a b c Creed, I. F., D. L. Morrison, and N. S. Nicholas. "., Is Coarse Woody Debris a Net Sink or Source of Nitrogen in the Red Spruce – Fraser Fir Forest of the Southern Appalachians, U.S.A.?" National Research Council Canada 24 (2004): 716-27. Print.
- ^ a b c "Land of the Great Forests". National Park Service. Retrieved February 23, 2024.
- ^ a b Bentley, Stanley L. Native Orchids of the Southern Appalachians. Chapel Hill, NC: University of North Carolina Press, 2000. Print.
- ^ a b c d Harold W. Keller; Paul G. Davidson; Christopher H. Haufler; Damon B. Lesmeister (2003). "Polypodium appalachianum: An Unusual Tree Canopy Epiphyte in the Great Smoky Mountains National Park". American Fern Journal. 93 (1). American Fern Society: 36–41.
- ^ a b c d e f g h i j k l m n o p q r s t u v w x y "The Southern Appalachians: A History of the Landscape" (PDF). USDA Forest Service. May 1998. Retrieved February 20, 2024.
- ^ a b c "Fraser Fir." US Forest Service. Donald E. Beck, n.d. Web. 6 Feb. 2024.
- ^ a b c d e f g h "Earth Day: After decades of devastation, a comeback for WNC forests." Citizen Times. Anne McDarris, 22 Apr. 2020. Web. 6 Feb. 2024.
- ^ a b c d e f g h "Conservation Movement Comes to the Southern Mountains". National Parks Service History. February 1, 2008. Retrieved February 20, 2024.
- ^ a b c "Celebrating a Century of Conservation: The Weeks Act Turns 100" (PDF). USDA Forest Service. March 17, 2011. Retrieved February 20, 2024.
- ^ a b c d "Proceedings from the Conference on the Ecology and Management of High-Elevation Forests in the Central and Southern Appalachian Mountains." US Forest Service. n.a., 14–15 May. 2009. Web. 6 Feb. 2024.
- ^ "Weather". Great Smoky Mountains National Park. Retrieved November 2, 2023.
- ^ a b c d e "Drought in the Southern Appalachian temperate rainforest? Part 1." Coweeta Listening Project. N.p., 8 Oct. 2012. Web. 1 Oct. 2013.
- ISBN 0-53316-528-8.
- ^ a b c "Great Smoky Mountains Threatened and Endangered Species". National Park Service. Retrieved February 23, 2024.
- ^ "Paravitrea andrewsae High Mountain Supercoil". NatureServe Explorer. Retrieved January 12, 2024.
- ^ C. E. Tewksbury; H. Van Miegroet (August 1, 2007). "Soil organic carbon dynamics along a climatic gradient in a southern Appalachian spruce–fir forest". Canadian Journal of Forest Research. 37 (7). Canadian Science Publishing: 1161–1172.
- ^ "Terrestrial Habitats of Virginia" (PDF). Conservation Gateway. Retrieved January 11, 2024.
- ^ a b Stupka, Arthur. Trees, Shrubs, and Woody Vines of Great Smoky Mountains National Park. Knoxville, TN: University of Tennessee Press, 1964. Print.
- ^ "Common Orchids in the Smokies". National Parks Service. Retrieved January 11, 2024.
- ^ "Bazzania nudicaulis a liverwort". NatureServe Explorer. Retrieved January 11, 2024.
- ^ a b "Appalachian & Mixed Mesophytic Forests." WWF. WWF, n.d. Web. 1 Oct. 2013.
- ^ "Great Smoky Mountains Animals". National Park Service. Retrieved February 23, 2024.
- ^ a b "Great Smoky Mountains Disptaches_Lichens". National Park Service. Retrieved February 23, 2024.
- ^ a b "Cherokee History in the North Carolina Mountains and Beyond". Blue Ridge National Heritage Area. October 16, 2013. Retrieved November 1, 2023.
- ^ "Pisgah & Its History". Pisgah Conservancy. Archived from the original on November 29, 2023. Retrieved November 1, 2023.
- ^ a b c d "Wildland Fire." National Park Service. GSMNP, n.d. Web. 6 Feb. 2024.
- ^ a b "Drivers and ecological impacts of a wildfire outbreak in the southern Appalachian Mountains after decades of fire exclusion." US Forest Service. Matthew J. Reilly, Steven P. Norman, Joseph J. O'Brien, E. Louise. Loudermilk, n.d. Web. 6 Feb. 2024.
- ^ a b c d "Acid Rain and Air Quality in the Appalachians." US Forest Service. Coweeta Listening Project, 16 Sep. 2011. Web. 6 Feb. 2024.
- ^ Ralph E. Baumgarder Jr.; Selma S. Isil; Thomas F. Lavery; Christopher M. Rogers; Volker A. Mohnen (2003). "Estimates of cloud water deposition at Mountain Acid Deposition Program sites in the Appalachian Mountains". Journal of the Air & Waste Management Association. 53 (3). Air & Waste Management Association: 291–308.
- ^ a b J. D. Joslin; C. McDuffie; P. F. Brewer (1998). "Acidic Cloud Water and Cation Loss from Red Spruce Foliage" (PDF). Water, Air, and Soil Pollution. 39. Kluwer Academic Publishers: 355–363.