The Butte Research Natural Area
Total Page:16
File Type:pdf, Size:1020Kb
THE BUTTE RESEARCH NATURAL AREA Supplement 261 Sarah E. Greene and Larry R. Scofield2 The Research Natural Area described in this Of the 105 Federal Research Natural Areas supplement is administered by the Bureau of established in Oregon and Washington, 45 are Land Management, U.S. Department of the Inte- described in "Federal Research Natural Areas in rior. Bureau of Land Management Research Nat- Oregon and Washington: A Guidebook for Scien- ural Areas are administered by District Offices tists and Educators" (see footnote 1). Supple- that are organizational subdivisions of their State ments to the guidebook describe additions to the Offices. Scientists wishing to use these Research system. Natural Areas (RNA) in Oregon and Washington The guiding principle in management of should contact the District Manager of the district Research Natural Areas is to prevent unnatural in which the Research Natural Area is located. encroachments or activities that directly or indi/ The Butte Research Natural Area is part of a rectly modify ecological processes. Logging and Federal system of such tracts established for uncontrolled grazing are not allowed, for exam- research and educational purposes. Each RNA ple, nor is public use that might impair scientific constitutes a site where natural features are pre- or educational values. Management practices served for scientific purposes and natural proc- necessary for maintenance of ecosystems may be esses are allowed to dominate. Their main allowed. purposes are to provide: Federal Research Natural Areas provide a Baseline areas against which effects of unique system of publicly owned and protected human activities can be measured; examples of undisturbed ecosystems where scien- Sites for study of natural processes in undis- tists can conduct research with minimal inter- turbed ecosystems; and ference and reasonable assurance that 3. Gene pool preserves for all types of organ- investments in long-term studies will not be lost isms, especially rare and endangered types. to logging, land development, or similar activities. The Federal system is outlined in "A Directory In return, a scientist wishing to use a Research of the Research Natural Areas on Federal Lands Natural Area is obligated to: of the United States of America."3 Obtain permission from the appropriate administering agency before using the 1 Supplement No. 26 to "Federal Research Natural Areas in area ;4 Oregon and Washington: A Guidebook for Scientists and Educators," by Jerry F. Franklin, Frederick C. Hall, C.T. Abide by the administering agencys regula- Dyrness, and Chris Maser (Portland, OR: U.S. Department tions governing use, including specific lim- of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station; 1972. 498 p.). itations on the type of research, sampling methods, and other procedures; and 2 Sarah E. Greene is a research forester, U.S. Department of 3. Inform the administering agency on prog- Agriculture, Forest Service, Pacific Northwest Research ress of the research, published results, and Station, Corvallis, Oregon. Larry R. Scofield is a Wildlife Biologist/Botanist, Bureau of Land Management, Salem, disposition of collected materials. Oregon. 4 Seven agencies cooperate in this program in the Pacific Northwest: Army Corps of Engineers; U.S. Department of 3 Federal Committee on Ecological Reserves. 1977. A direc- Agriculture—Forest Service; U.S. Department of the tory of the Research Natural Areas on Federal lands of the Interior—Bureau of Land Management; Fish and Wildlife United States of America. Washington, DC: U.S. Depart- Service; and National Park Service; U.S. Department of ment of Agriculture, Forest Service. Energy; and U.S. Department of Defense. 1990 1 The purpose of these limitations is to: Ensure that the scientific and educational values of the tract are not impaired; Accumulate a documented body of knowl- edge about the tract; and 3. Avoid conflict between studies. Research must be essentially nondestructive; destructive analysis of vegetation is generally not allowed, nor are studies requiring extensive mod- ification of the forest floor or extensive excavation of soil. Collection of plant and animal specimens should be restricted to the minimum necessary to provide voucher specimens and other research needs. Under no circumstances may collecting significantly reduce population levels of species. Collecting must also be carried out in accordance with applicable State and Federal agency regula- tions. Within these broad guidelines, appropriate uses of Research Natural Areas are determined by the administering agency. 2 THE BUTTE RESEARCH NATURAL AREA A small, basalt ridge on the west edge of the Willamette Valley dominated by Pseudotsuga menziesii5 plant communities. The Butte Research Natural Area (RNA) is a northwest corner of The Butte RNA. It is easiest small, basalt ridge in the ecotone of the Wil- to walk up the northwest edge, about 10 meters lamette Valley and the Oregon Coast Range Phys- after crossing onto BLM land, to approach the iographic Provinces. The top of the ridge supports ridgetop. a moist, lush herbaceous community with an overstory ofPseudotsuga menziesii. The east- and Environment west-facing slopes are dominated by P. menziesii, Abies grandis, Acer macrophyllum, and Poly- The Butte RNA lies on the east edge of the foot- stichum munitum. Ages of the stands are mixed. hills of the Oregon Coast Range. Elevation ranges Though the RNA is not unique and is very small, from 300 to 410 meters, considerably lower than it is one of the few remaining stands of relatively most of the Coast Range, but well above the Wil- undisturbed (by logging) timber amidst primarily lamette Valley floor (elevation of McMinnville is agricultural land. Ninety-four blown down trees 48 m). The top of The Butte is broad and gently were removed along the east edge of the RNA in sloping. West- and east-facing slopes break off 1967. sharply, as much as 80 to 90 percent in some The 16-hectare area is in Yamhill County, Ore- places. This is especially true toward the south gon, and is administered by the Yamhill Resource end; slopes at the north end break off more gently. Area of the Salem District, Bureau of Land Man- The east-facing slopes remain fairly steep until a agement (BLM). The RNA comprises the NVV1/4 wet toeslope is reached at the bottom. The west- of the SW1/4 sec. 19, T. 4 S., R. 5 W of the Wil- facing slopes break steeply, but become more gen- lamette Meridian (Lat. 45° 13 N.; long. 123° 18 tle within 10-15 m. At this break, the topography W). begins to level off, becoming rather broken and uneven. Access and Accommodations There are two small areas of slope failure on the east side (fig. 2). Soil creep above these failures The Butte RNA is 8 air miles due west of occurs as the slope breaks offfrom the ridge. Trees McMinnville, OR, and lies between the North and with pistol butts are evidence of this. The failures South Forks of the Yamhill River (fig. 1). Permis- themselves are steep and dish-shaped. Acer mac- sion to visit The Butte must be obtained from the rophyllum is the only tree growing on these owners of the S4 Ranch; contact the Salem BLM slumps; the understory is dominated by Poly- District Office for more information. At the inter- stichum munitum. section of route U.S. 99W and route 18 just south A modified marine climate dominates the area of McMinnville, turn west on Old Sheridan Road with large-scale air movement coming from the (old highway 18), travel L2 miles and turn north west. The influence of marine air tends to mod- (right) on Peavine Road. Peavine Road remains erate temperatures and results in fairly similar paved for 7 miles where it turns to gravel; at this average temperatures on the valley floor, in the point drive 0.2 mile and turn left (south) on Ben- foothills of the Coast Range, and in the central nette Road. Follow this road through the gate for portion of the Coast Range in Yamhill County the S4 Ranch; cross two cattle guards and park (table 2). This is not true of average annual rain- behind the green building at the end of the gravel fall, however. Rainfall increases significantly road, about 0.7 mile from the S4 Ranch gate. Pro- from the valley floor up into the Coast Range ceed on foot following an old country road for (table 2). In all three areas, 70 percent of the rain about 0.2 mile where you enter intact forest that is BLM land. The road continues through the 5 Table 1 contains a partial list of plants found in The Butte Research Natural Area. 3 Figure 1—Location of The Butte Research Natural Area, in west-central Oregon. 4 Figure 2—East slope of The Butte Research Natural Area above a slope failure. Note pistol-butted trees. occurs between November and March; 5 to 10 per- is comprised of Cornus nuttallii, Acer macro- cent occurs from June through August. phyllum, and Quercusgarryana. Symphoricarpus The soils on the top of the ridge differ in depth albus, Holodiscus discolor, and Corylus cornuta over the fractured basalt. Soils deepen to as much var. californica grow on the north end of the ridge as 40 centimeters as they extend away from the and along the edges of the ridge where the slope ridge noses on the north and south ends. The soils begins to steepen. The rest of this broad ridge is on the ridge noses are shallow, 1-10 cm, and were dominated by a lush, herbaceous understory of formed primarily from organic accumulation. Circaea alpina, Montia sibirica, Viola glabella, Fractured basalt reaches the surface in these Galium aparine, Vancouveria hexandra, areas, thereby contributing to poor moisture- Thalictrum sp., Adenocaulon bicolor, Smilacina holding capacity.