6 km 2). The upper limit of montane forests, the tree line, is often marked by a change to es that. l. New answers. Himalayan mountain forests have been a potential candidate for the investigation of perturbations due to the complex geography in which they sustain and the sensitivity of the species toward human disturbance and climate change. elevation regions B. What's this phenomenon ? A. B- Erosion occurs as surface water carries sediment and the sediment is deposited near oceans and lakes. Insects burrow and munch; trees deploy lethal and disruptive defenses in the. Trail Type: Loop. l. , 2008), climate warming having been found to reduce sensitivity of recent tree-growth to temperature at high northern latitudes and affect tree survival (Briffa et al. Gen. s. Study site and elevation gradient. Geologists, it turns out, don't readily agree what height makes a mountain a mountain, but an elevation of 300 meters (1,000 feet) is generally high enough to earn the classification. Gen. l. The park, nearly surrounded by Loyalsock State Forest, is in the Loyalsock Creek valley on Pennsylvania Route 154 in Forks and Shrewsbury Townships southeast of the borough of Forksville. The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. long-term atmospheric circulation. Its deepest point is 1,450 feet below the rim. This image was generated by NOAA from digital data bases of land and. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Decreases in caused by climate change D. HOOD,2 BANNING J. Search for an answer or ask Weegy. Acid caused by S*O_{3} combustion mixed with atmospheric water vapor B. The genus presumably evolved during the Plio-Pleistocene uplift of the. Highest point in Pennsylvania, the 'cradle of forestry' and other little-known facts from our state parks and forests A separate study recently looked at the impact on the forest canopy by. From the preceding analysis, it is evident that the average elevation of treeline in the Western Himalaya is around 3615 m asl, but trees are recorded up to 4200 m. Climate will increasingly determine post-fire tree regeneration success in low-elevation forests, Northern Rockies, USA. Most Pennsylvania forests are now in age classes between 60 and 120 years, with the largest 10-year classes in the 81- to 100-year range (Jenkins et al. Highest point in Pennsylvania, the 'cradle of forestry' and other little-known facts from our state parks and forests. Like other grouse, they are ground. A contour interval is the difference in elevation between any two adjacent contour lines. Desai,7 Jose Negron6 and Russell K. This phenomenon is: Decreased in pH caused by climate change. Treelines represent an abrupt change in land cover by a dominant life form, a. Elevation + TEI indicated that the predicted occurrence of the northern hardwood forest type was negatively correlated with elevation and TEI when. highland C. Moore,1,†* Nicole A. . S TARR,1 DANIEL B. The sites exhibiting the. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Some scientists propose that increased soil acidity might be the cause. Within the subalpine zone, high-altitude fir occupies the maximum area (1719. The upper limit of montane forests, the tree line, is often marked by a change to es that. Negative effects from climate change will likely reduce the habitat of high. Ask a question. A. These high-elevation forests share several charac-teristics, including high snowpack retention, low species diversity, low evapotrans-piration and climatic water deficit, longer and more variable fire return intervals, and high sensitivity to changes in climate. Some scientists propose that increased soil acidity might be the cause. chaparral Weegy: Because they are located above 15,000 feet, areas in the Tierra Nevada elevation zone have chaparral ecosystems. l. Some scientists propose that increased acidity might be. Proceedings from the Conference on the Ecology and Management of High-Elevation Forests in the Central and Southern Appalachian Mountains 94 GTR-NRS-P-64 INTRODUCTION Habitat fragmentation is a major factor in the loss of forest biodiversity (Hagan et al. Lessons from Rockies’ long history with fire. grassland B. The buffer zone area of the NDBR is characterized by a unique combination of diverse forest communities, represented by mixed temperate and tropical forests which occupy the lower altitudes, and Birch (Betula utilis) and Silver fir (Abies pindrow) forests dominating the sub-alpine areas. This phenomenon is: Decreased in pH caused by climate change. Together, these factors control the range of temperatures and the amount of rain and/or snow each region receives. Black lines are fitted predictions from regression models from 768 locations within the White Mountain National Forest from 1993 to 2009. Forest: Forest County High Point: 1954: Northern Allegheny Plateau: 134: 14: 42. government officially recognized the name of the mountain as “Mount McKinley” (named. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Rating. In high elevation forest in Pennsylvania ecologists have noticed a serious decline in certain tree species. Over the twenty-first century, the combined effects of increased fire activity and climate change are expected to alter forest composition and structure in many ecosystems by changing postfire successional trajectories and recovery. 2009; Groeneveld et al. F. political regions C. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. The Cumberland Mountains are a mountain range in the southeastern section of the Appalachian Mountains. Two academics, Ryan Utz, an assistant professor of water resources at. The increase of altitude is accompanied by decrease of atmospheric pressure and air density. Department of Environmental Science & Policy, University of California, Davis, California 95616 USA. Rep. At high altitude the air composition is characterized by low contents of fine particles (dust, etc. Highest point in Pennsylvania, the 'cradle of forestry' and other little-known facts from our state parks and forests. 3. This phenomenon is: Decreased in pH caused by climate change. The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. High elevation and the rain-shadow effect from theThe record-setting 2020 fire season, with three of Colorado’s largest fires, helped push the rate of burning in high-elevation forests in Colorado and Wyoming into uncharted territory relative. elevation regions B. User: in high elevation forests in pennsylvania ecologists have noticed a serious decline in certain tree species some scientists (More)In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. to 2500 m a. elevation. Rentch, James S. Some scientists propose that increased soil. high-elevation tree species, treeline is an abrupt bound-ary in this area. Ruffed Grouse grow to about the size of a chicken. Silva2, W. These are high-altitude valleys in the Himalaya, characterized by upper temperate and subalpine climatic conditions. The timber era of the late 1800s and early 1900s (as late as 1942) destroyed most of the boreal forest on a large. Some scientists propose that increased soil acidity might be the cause. Some scientists propose that increased soil acidity might be the cause. chaparralSearch for an answer or ask Weegy. , 1998). Some scientists propose that increased soil acidity might be the cause. The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. Mount Davis is the highest point in Pennsylvania. What's this phenomenon? Advertisement Expert-Verified Answer question 1 person found it helpful pstnonsonjoku Weegy: In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. climate regions D. This phenomenon is: Decreased in pH caused by climate change. Soils are wetter than in the other two high-elevation forest communities and the vegetation of the community resembles that of lowland spruce - fir forest. 3. Weegy: Dramatic irony is when the words and actions of the characters of a work of literature have a different meaning for the reader than they do for the characters. (Kessler and Schmidt-Lebuhn, 2006). Weegy: An ecologist is a scientist who studies how animals and plants interact with their environment. Most Pennsylvania forests are now in age classes between 60 and 120 years, with the largest 10-year classes in the 81- to 100-year range (Jenkins et al. D- Erosion occurs through deflation, and sand that. The forests of the Allegheny Plateau once comprised. The gorge extends 47 miles with a 12-mile section designated as a National Natural Landmark. Some scientists propose that increased soil acidity might. Mountaintop removal mining (MTR), also known as mountaintop mining (MTM), is a form of surface mining at the summit or summit ridge of a mountain. Check out this video on monitoring high-elevation forests in the Sierra Nevada. Rank County Peak Elev-Ft Range (Level 5) Prom-Ft Ascents; 47. The fire. Journal of Biogeography. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. The northern hardwood forest occupies the northern third of the state and extends south at high elevations along the Allegheny Front. ©Zack Frank/Shutterstock. Douglas-fir is also frequently planted on cutover areas within this zone. 1 The treeline concept. tropical forest D. Due to the climate that comes with their elevation, the highest areas of Southern Appalachia are home to plant. Strong interannual links between aridity and high. 9787 10/21/2020 Biology College answer answered in high elevation forests n Pennsylvania, ecologists have noticed a serious decline in certain tree species. 10/21/2020 Biology College answer answered in high elevation forests n Pennsylvania, ecologists have noticed a serious decline in certain tree species. High altitude tree growth is predominantly limited by low temperature, and thus more responsive to climate warming. R. A major source of timber, ponderosa pine forests are also important as wildlife habitat, for recreational use, and for esthetic values. Some scientists propose that increased soil acidity might be the cause. From late June through September, field crews hike to plots randomly located in the high-elevation white pine forested areas in Sequoia, Kings Canyon, and Yosemite national parks (Figure 1). The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. There are several different types of roosts that serve different purposes—day and night roosts provide habitat. 50 °C ± 0. Little brown bats are not territorial—they live in colonies numbering in the hundreds of thousands of individuals. leucopodia is a cosmopolitan species that can be found on different substrates at lower elevations (Tran et al. View. New research shows that if current rates of decline continue in high elevation forests several native Hawaiian forest birds endemic to the island of Kaua‘i. tropical forest D. , 2007; Steinbauer et al. Weegy: Tobacco was the most valuable cash crop produced in the 1700s until the invention of the cotton gin; happened to tobacco in the mid 1700s. [ This phenomenon is: Decreased in pH caused by climate change. The lake sediments revealed that high-elevation, or subalpine, forests in the Northern Rockies in Montana and Idaho have consistently bounced back after fires, even during periods of drier climate and more frequent burning than we saw in the 20th century. The identification and evaluation of forest biophysical parameters are very crucial in the current era of climate change. Connotative Weegy: Connotative definitions are. 10 MgCha − 1 from mid-to high-elevation forests in the Garhwal Himalaya; Shaheen et al. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. 2009 May 14-15; Slatyfork, WV. They were joined by the charcoal industry; an ironworks furnace cleared roughly an acre of trees every day to make charcoal, a key. This two-mile round trip explores the grassy, sun-drenched summit southeast of the pinnacle, climbing through a mossy, gnarled forest to a high-elevation grassland. As such, more than 31,000 square miles of high-elevation forests — or roughly 11 percent of forest cover in the western U. This process is. mitchellii is only known from high-elevation Polylepis forests of Peru, whereas D. Rating. Some scientists propose that increased soil acidity might be the cause. Scenery: The trail primarily travels through. This phenomenon is: Decreased in pH caused by climate change. Some maps are so common that a child would recognize them, while others are used only by professionals in specialized fields. 4 (676) Ringing Rocks County Park. Acid caused by S*O_{3} combustion mixed with atmospheric water vapor B. [ The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. Hough, A. Some scientists propose that increased soil acidity might be the cause. C. Significant declines in tree. Here, we analyse tree-ring-based growth-climate relationships for two dominant tree species along an 800-m elevational. periodic fires, The biome with high amounts of precipitation, large narrow. In high elevation forest in Pennsylvania ecologists have noticed a serious decline in certain tree species. Search for an answer or ask Weegy. Some scientists propose that increased soil acidity might be the cause. This phenomenon is: Decreased in pH caused by climate change. (Kessler and Schmidt-Lebuhn, 2006). g(-1) leaf N. This page shows the elevation/altitude information of Pennsylvania, USA, including elevation map, topographic map, narometric pressure, longitude and latitude. In high elevation forest in Pennsylvania ecologists have noticed a serious decline in certain tree species. This study was carried out in two high-elevation forest sites in the Chilean Altiplano, one of P. In high elevation forest in Pennsylvania ecologists have noticed a serious decline in certain tree species. Those forests, which made up about 22% of the forest area they studied, tended to be located above 3,280 feet. [ The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. A. By subtracting the elevation difference between two points you can estimate the relief or elevation change. g. 1). Acid rain is caused by the combination of sulfur dioxide (SO₂) from combustion and. 1400 meters), high elevation forests are characterized by subalpine fir, mountain hemlock, and Alaskan yellow cedar. • A significant effect (p < 0. By Jane Qiu on January 27, 2015. Elevation, or geometric height, is mainly used when referring to points on the Earth's surface, while altitude or geopotential height is used for points above the surface, such as an aircraft in flight or a spacecraft in orbit, and depth is used for points below the surface. NRS-P-64. Blue Knob State Park is a 6,128-acre (2,480 ha) Pennsylvania state park in Kimmel, Lincoln, and Pavia townships in Bedford County, Pennsylvania, in the United States. 8. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. 9 m/y. We move from low to high elevation, recognizing that forest zone elevations are contingent on latitude across the region (Fig. Weegy. l. 8 ha)) forest seeps [ 336 ]. In high elevation forest in Pennsylvania ecologists have noticed a serious decline in certain tree species. The general definition used is one followed by the US Geological Survey and the Geologic. Ozone depletion . The. Question 7 options: denotative Direct None of the Above. Some scientists propose that increased soil acidity might be the cause. Expert Answered. New methods have opened research. However, how climate, biodiversity, and structural attributes co-determine spatiotemporal variation in forest biomass remains. s. Some scientists propose that increased soil acidity might be the cause. with fewer old forests. These changing conditions have significant implications for carbon storage, snowpack, and the. In high-elevation. distance from the equator. User: how. 2. Some scientists propose that increased soil acidity might be the cause. Some scientists propose that increased soil acidity might be the cause. High-elevation forests only burn. political regions C. This study was carried out in two high-elevation forest sites in the Chilean Altiplano, one of P. Virginians for Wilderness Web Site. 2) is a continental–dry mountain climate with an average annual precipitation sum between ≈700 and 1400 mm (top of the mountains). Some scientists propose that increased soil acidity might be the cause. This community occurs around heath woodlands and fens in high-elevation valleys in the White Mountains and the North Country. High-mountain ecosystems like the upper forest line (or timberline), the tree line ecotone, and the subalpine meadows and scrublands are particularly sensitive to changes in both climate and land use (Ameztegui et al. 2004). l. Search for an answer or ask Weegy. What's this phenomenon ? A. Score 1 User: The ring of fire on the map. Contour lines show the elevation above sea level at a given point on your map. The study, published today in the journal Nature Communications, found that white pine blister rust disease expanded its range into higher-elevation forests in the southern Sierra Nevada between. The study observes changes in upslope advance in high-elevation forest fires, how climate aridity—and our warming planet—is correlated with these fires, and how biodiversity loss and vegetation conversion factor into these changing conditions. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. If you experience some of the following signs and symptoms of depression nearly every day for at least 2 weeks, you may be living with depression: feeling sad, anxious, or “empty”. This long view. Projected changes in climate are expected to shift the ranges of many tree species poleward and to higher elevations. Increasing minimum temperatures is one factor attributed to northward range expansion of the mountain pine beetle in Canada. 0 acre (0. By Geology and Ecology of National Parks. New answers. The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. Weegy: In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. It is expected that rapid warming will increase temperature sensitivity of tree growth, and thus substantially alter forest ecosystem composition and functioning due to low. PNAS caught up with the researchers on the. Forest Glow - in explore. Forest trees exhibit a large variation in basal area increment, which depends on tree specific factors, inter-tree relations and the environment. Some scientists propose that increased soil acidity might be the cause. Weegy: In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. in high elevation forests n Pennsylvania, ecologists have noticed a serious decline in certain tree species. In high elevation forest in Pennsylvania ecologists have noticed a serious decline in certain tree species. l. Some scientists propose that increased soil acidity might be the cause. The tr 107 ees at high elevations of MTP are almost all conifers, mainly Abies 108Studies have shown that many lower-elevation forests on the West Coast of the United States were experiencing a “deficit” in fire activity compared with historical patterns, partly because of. The forests were stratified into three altitudinal zones: low-altitude forest (LF), ranging from 900 m a. Stuttgart. Here, we assessed soil properties. Little brown bats also live in high-elevation forests in Mexico. Red spruce dominates at low elevations [ 327 ]. The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. 208,000 acres (84,200 hectares) and is a prime example of a high-elevation forest fire. Jozeal. A warming climate, however, has increased the size and severity of fires with significant ecosystem and societal implications. 1). This phenomenon is: Decreased in pH caused by climate change. The limit set by low temperature at high elevation or high polar latitudes is termed ‘treeline’ (alpine or arctic treeline). l. Search for an answer or ask Weegy. Due to wildfire damage in 2016, the true Chimney Tops. Plots were randomly installed at different locations for each. 1999). Some scientists propose that increased soil acidity might be the cause. For example, outbreak populations of southern pine beetle are now persistent in New Jersey (21), and mountain pine beetle outbreaks in high elevation forests are continuing at paces not seen over the past century (22). The high-elevation open-canopy northern red oak stands under investiga-High-elevation forests are experiencing high rates of warming, in combination with CO2 rise and (sometimes) drying trends. Acid caused by S*O_{3} combustion mixed with atmospheric water vapor B. Species niche differences shape our high-elevation forest communities. (Pittsburgh) — Pennsylvania forests are facing looming threats that could catastrophically change the state’s landscape. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Some scientists propose that increased soil acidity might be the cause. Coal seams are extracted from a mountain by removing the land, or overburden, above the seams. state of Alaska. Relief shows the difference in elevation between two points on a map. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. What's this phenomenon? O A. Table 1 summarizes biophysical attributes of the three studied valleys. High-elevation forests including treeline ecotones are particularly valuable as wildlife habitats and because of their protective function such as avalanche and erosion control (e. in high elevation forests n Pennsylvania, ecologists have noticed a serious decline in certain tree species. Above: Mountain pine beetle and white pine blister rust have heavily impacted this whitebark pine forest in the Mt. In the coastal fog belt, Douglas-fir is rare and Sitka spruce becomes abundant. Not least they serve as an. High-elevation forest stands across the mountain range are reminiscent of the high-latitude boreal-deciduous ecotone (Whittaker, 1956), and include a northern hardwood species assemblage with isolated spruce-fir forest zones. 2015). Rating. This is a summary of the most current data available describing Pennsylvania’s forest resources. The genus presumably evolved during the Plio-Pleistocene uplift of the. E) North America. D) Georgia. lower than the actual altitude above sea level. burned in forests extending to 12,000 feet (3,650 meters) and reached the upper tree line of the. BERLIN—Forests at high-altitudes in the Himalayas and Tibetan Plateau are at risk of dying off or retreating downslope as a result of climate change, threatening. 2010. In high elevation forest in Pennsylvania ecologists have noticed a serious decline in certain tree species. Some scientists propose that increased soil acidity might be the cause. Worlds End State Park is a 780-acre (316 ha) Pennsylvania state park in Sullivan County, Pennsylvania. Throughout the 1800s, timber barons cut down nearly all of Pennsylvania’s forests. Asked 5/25/2022 8. In general, fine roots showed their highest nutrient concentrations. Some scientists propose that increased soil acidity might be the cause. We predicted mountain lions select hiding cover in the form of high canopy forests, forested drainage bottoms, and rugged terrain that can facilitate stalking prey, and that they avoid open vegetation cover. Rating. Weegy: Weegy. tropical forest D. highland C. In high elevation forest in Pennsylvania ecologists have noticed a serious decline in certain tree species. The 59,000-acre forest district, much of which is along the ridges of the Laurel Highlands, includes the highest point in Pennsylvania: 3,213-foot Mt. We document an upslope advancement of high-elevation fires of 7. 3 miles long, it has one of the best waterfall features of any trail in central Pennsylvania. The study area comprises Kailash Kund (lake) - Chattargalla ridge (32 o 45′14″ to 32 o 53′55″N and 75 o 37′50″ to 75 o 50′10″ E, elevation 2800 m to 4000 m) in Upper Bhaderwah Valley of district Doda in the Union territory of Jammu and Kashmir (Fig. Pennsylvania, constituent state of the U. At the highest elevations of the Allegheny Mountains in West Virginia, generally above 1,000 m, relict patches of boreal forests remain from cooler, periglacial times (Lesser 1993). Gómez‐Guerrero , J. Within the subalpine zone, high-altitude fir occupies the maximum area (1719. l to 1700 m a. Additionally, the northern Pennsylvania Ridge and Valley is relatively cloudy, although not to the degree of the region of the cloudy - day maximum (Reifsneider and Lull, 1965). The study, published last month in Ecosphere, is one of the first to document the effects of bark beetle kill on high elevation forests’ recovery from wildfire. Researchers from UM and the University of. Ozone depletion . The Himalayan Mountains are geodynamical important, featuring a wide climatic range with a rich diversity of flora, fauna, human communities, culture, and social set-up. , 2008a, Esper et al. In montane landscapes, the latter factors can vary significantly with topography at small spatial scales, potentially. As a result, onMoreover, this species does not share ecological requirements nor distribution with the species that seems to be the most closely related to it (D. We compare census data and social group counts from two forests in the Udzungwa Mountains, Tanzania. Some scientists propose that increased soil acidity might be the cause. s. Over time, the agency's jurisdiction has expanded not only to oversee. High-elevation pines, including whitebark pine, limber pine, and bristlecone pine, can be found up and down the full range of the Rocky Mountains. It also occurs farther south on north-facing. To characterize the annual cycle of. Ponderosa pine (Pinus ponderosa), also called western yellow pine, is one of the most widely distributed pines in western North America. The Cameron Peak Fire in Colorado in 2020 was the state’s largest fire in its history, burning over 208,000 acres (84,200 hectares) and is a prime example of a high-elevation forest fire. Photos (750) Directions. Forest: Forest County High Point: 1954: Northern Allegheny Plateau: 134: 14: 42. This phenomenon is: Decreased in pH caused by climate change. higher than the actual altitude above sea level. Some scientists. What's this phenomenon ? A. INTRODUCTION. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. In all sites, fine root nutrient concentrations varied with respect to forests and seasons. Ozone depletion . Methods Archive maps, satellite and on-ground data. Whats the phenomenon? A. Final answer: The serious decline in certain tree species in high-elevation forests in Pennsylvania is caused by acid rain. Balsam fir dominates, although heartleaf birch and red spruce may be present. Such information can be used in a variety of applications and at different geographical scales, including land surface process monitoring, natural resource management, and hydrological modelling (Fang,. Forests consisting of two of the most widespread HEFNPs, whitebark pine (Pinus albicaulis) and limber pine (Pinus flexilis),. S. Question. This phenomenon is: Decreased in pH caused by climate change. In high -elevation forests in Pennsylvania , ecologists have noticed a serious decline in certain tree species. We found that the amount of burning in subalpine forests of the Northern Rockies over the 20th and 21st. 30 to 137. N concentration in fine roots was highest followed by K and P. 25 m. D. In high-elevation. 100 S Main St 300 S Main St 232 Smith St 649 S Broad St 410 Thompson St Jersey Shore Porter Township 347 Oliver St 230 High St 321. political regions C. Therefore, the combination of dendrochronology and NDVI is widely used to study. Glaciers scoured the landscape, grinding the high places and mixing the soil with rocks. Proceedings from the conference on the ecology and management of high-elevation forests in the central and southern Appalachian Mountains. highland C. Most of the high altitude wetlands in South Asia, including Nepal, lie within the Hindu Kush Himalayan Region that extends over 3,500 km and covers approximately 3. Trahan,2,† Phil Wilkes,3 Tristan Quaife,4 Britton B. Check out this 0. economic regions The forests of the Pacific Northwest are just one of the many different economic regions in the United States where many people work in the same industry. Search for an answer or ask Weegy. Some scientists propose that increased soil acidity might be the cause. A. as high-elevation forests. 6 km 2). This phenomenon is: Decreased in pH caused by climate change. 3. Some scientists propose that increased soil acidity might be the cause. Credit: Grace Carter. Forest fires of the western United States have advanced upslope over the past few decades, scorching territories previously too wet to burn. A. What's this phenomenon ? A. Hike through a gorgeous waterfall-filled stream valley to lofty views on the popular Chimney Tops Trail. High-elevation forests only burn about once every 100 to 250 or more years on average. Mt. 008) of elevation was observed on the forest structural variables, biomass and carbon stock.