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Lowland Forest | Subalpine | Alpine | River | Lake | Coastline | Rain Forest
The lowland forest grows further inland from the coast, and above the rain forest valleys. You will not find Sitka spruce here, but you may see grand fir. Western hemlock will probably be the most common tree, although stands of Douglas-fir may prevail where fire or drier conditions caused by the rain shadow give these trees an advantage. Western redcedar is never an abundant tree, but its gradual disappearance is a true indicator that the upper limits of this zone have been reached.
This zone starts at lower elevations and extends up to about 2,000 feet, or where the silver fir zone begins. Dominant tree species within this zone include Douglas-fir and western hemlock, with western redcedar, grand fir, red alder, and big leaf maple also occurring within this zone. Unlike some other areas of the park, low-elevation stands around Lake Crescent also contain madrone, Pacific dogwood and Douglas maple. In very old stands, the dominant species includes western hemlock and western redcedar. Analysis of digital (GIS) data indicates that the majority of the watershed falls into this zone. Common shrubs include salal, Oregon grape, red huckleberry, Alaska huckleberry, rose and salmonberry. Herbaceous plants include swordfern, deerfern, twinflower, violet, vanillaleaf, trillium, and foamflower (Henderson et al. 1989).
Mountain Hemlock Zone or Subalpine fir Zone
As elevation increases, temperatures cool and more moisture falls as snow during the long winters; growing seasons get shorter and the subalpine zone takes over. Pacific silver fir grows here as well as in the Montane Zone, and in the western portion of the park may be prevalent. The presence of mountain hemlock, subalpine fir, or Alaska yellow-cedar groves assure you that this is the subalpine zone. The lower portion of the subalpine zone consists of continuous forest, but in the upper part of this zone the forest thins out. Delightful subalpine meadows graced with wildflowers and glacial lakes often intermingle with stands of firs. Subalpine fir is especially well adapted to the heavy snows and cold temperatures experienced here. Its spire-like shape sheds snow. It also extends its lower branches under the snow, often putting down roots where they touch the ground. When the snow melts the trees may be surrounded by skirt-like arrangements of longer, lower branches. Common shrubs within this zone include Alaska huckleberry, oval-leaf huckleberry, blue-leaf huckleberry, white rhododendron, mountain ash, and red heather. Herbs include five-leaved bramble, trailing bramble, avalanche lily, queen’s cup, beargrass, and pyrola. In eastern portions of Olympic, summer heat dries out the soils, limiting the growth of mountain hemlock trees. There, the subalpine fir and Lodgepole pine dominate drier sun-facing slopes.
A Treeless World
Increasing elevation causes even more severe climatic conditions. Trees become fewer, shorter, and more contorted. Trees are dwarfed compared to their cousins living lower down the mountain--a 100-year-old tree may be only three feet tall. Eventually tree line is reached, beyond which trees do not grow, but a profusion of wildflowers often rewards your eye in a vivid display of insect attracting colors. These small flowering plants dominate the landscape. They huddle together in groups of different species. Plants that form these mats are sometimes called cushion plants.
Olympic's Circulatory System
Your body transfers nutrients through a network of streams and rivers we call arteries and veins. Arteries and veins feed your cells just like rivers feed Olympic's forests. Rivers carry nutrients to the forests by way of fish, insects and other animals that live in this aqueous world. These animals are the red-blood cells of Olympic's rivers. Anadromous fish, such as salmon, play a crucial role in feeding the forests. They spend much of their life at sea building up strength and energy for their return trip home. After two to four years they "smell" their way back upriver to the clean, cool beds of gravel to spawn. After laying thousands of eggs, salmon die. Their carcasses line the riverbanks and supply a wealth of nourishment to forest animals. Thus, the ocean's bounties are circulated back into the forest community.
What happens when we clog our rivers’ arteries with dams? What happens to a river’s ability to transfer nutrients from the oceans to the forests? Rivers face many new hazards in today's world: fishery reductions, habitat destruction from logging along a river’s edge, run-off pollution from roads and development, water use from growing populations, water flow shifts due to climate change. Olympic National Park's rivers are protected from some of these impacts, but further protection depends on you.
After the Ice
Shi Shi to Sand Point
Sand Point to Rialto
Rialto to Oily City
Oil City to Kalaloch
The dominant species in the rain forest are Sitka spruce and western hemlock; some grow to tremendous size, reaching 300 feet in height and 23 feet in circumference. Douglas-fir, western redcedar, bigleaf maple, red alder, vine maple, and black cottonwood are also found throughout the forest. Nearly every bit of space is taken up with a living plant. Some plants even live on others. These are the epiphytes, plants that do not come into contact with the earth, but also are not parasites. They are partly responsible for giving the rain forest its "jungly" appearance. Mosses, lichens and ferns cover just about anything else. Oregon oxalis is also a common ground cover. But because of this dense ground cover it is hard for seedlings to get a start. Many seedlings germinate on fallen, decaying trees. As they grow they send their roots down the log to the ground. Eventually the log rots completely away and a row of young trees is left, up on stilt-like roots, all in a row. The thick and protective vegetation also provides excellent habitats for the animals of the rain forest. In turn, they contribute to the health of the forest by keeping the rampant vegetation under control by browsing.
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For more information visit the National Park Service website