Originally established in 1976, through UNESCO's Man and the Biosphere Programme, the Cascade Head Biosphere Region (formerly known as the Cascade Head Biosphere Reserve) was expanded during the 2016 reauthorization to its current footprint. Within its boundaries are the Cascade Head Scenic Research Area, Cascade Head Experimental Forest, the Cascade Head Preserve, and the Cascade Head Marine Reserve and Marine Protected Areas. The diverse ecosystem includes the Salmon River and its estuary, a sandy littoral spit, densely forested coastal rainforest, a two-mile basalt headland covered in native coastal prairie and marine reserve stretching west into the waters of the Pacific. As with modern biosphere regions, there are core protected areas, areas of managed use, and areas of cooperation within the boundary.
The Nature Conservancy
In the early 1960s, volunteers organized an effort to protect Cascade Head from development. By 1966 they had raised funds and purchased the property, and then turned it over to The Nature Conservancy. Because of its ecological significance, Cascade Head Preserve and surrounding national forest and other lands won recognition in 1980 as a National Scenic Research Area[1] and a United Nations Biosphere Reserve.[2][3]
Conservancy researchers are testing methods of maintaining and restoring grassland habitat for the Oregon silverspot butterfly, including prescribed fire. Conservancy ecologists also monitor the populations of rare plants throughout the year. In spring and summer, teams of volunteers remove invasive species (such as Himalayan blackberry), help maintain trails, assist with research projects, and teach visitors about the Preserve.
Experimental Forest
View from Cascade Head
The 11,890-acre (4,810 ha) Cascade Head Experimental Forest was established in 1934 for scientific study of typical coastal Sitka spruce-western hemlock forests found along the Oregon Coast. The forest stands at Cascade Head have been used for long-term studies, experimentation, and ecosystem research since then. In 1974 an act of Congress established the 9,670-acre (3,910 ha) Cascade Head Scenic Research Area that includes the western half of the experimental forest, several prairie headlands, the Salmon River estuary to the south, and contiguous private lands.[4]
Before the establishment of the experimental forest in 1934 and for sometime after, an intense forest inventory was done to determine distribution, age classes, and volumes of major tree species. Early research at Cascade Head includes studies that determined life history and characteristics of native tree species; growth and yield of Sitka spruce-western hemlock, Douglas-fir, and red alder stands; and basic relations between vegetation and climate. A climate station established in 1936 is still operating and is an official United States Weather Bureau site. Between the 1940s and the 1960s, experimental, commercial sized harvests were done to evaluate the silvicultural and economic results of various tree-cutting methods.[5] Current research is being done on forest ecosystem productivity, wind disturbance, nutrient cycling, and global carbon cycling.
Research on the Salmon River estuary has been ongoing since the first dike breaching in 1979. Reestablishment of the salt marsh ecosystems continues to be studied and more recently use of these restored ecosystems by anadromous fish is being studied.
