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(LONG) Old-Growth found in oddest places
From The Oregonian, Nov. 27, 2002, p A25
Really old-growth trees found in the oddest places Researchers study satellite maps to get a bead on forestsin the U.S. that contain ancient specimens By ROBERT S. BOYD, Knight Ridder News Service Images from space satellites reveal hundreds of little-known primeval forests and stands of ancient trees scattered all across the United States. Scientists say these trees provide an unequaled record of droughts and floods that can help them understand historic disasters and predict environmental changes. Besides California's famed redwoods and giant sequoias, researchers have discovered that millions of very old trees remain in their pristine state in dozens of states from New NElgnad to the Carolinas and across Texas to Arizona and Nevada. "We can still find unmolested virgin forests," said David Stahle, a forest scientist at the University of Arkansas in Fayetteville. "There are still trees that are thousands of years old, the last relics of the great forest primeval that has been heavily disturbed or completely destroyed by man." To find unmolested trees, Stahle and his associates study images taken by NASA's Landsat satellite, looking for remote areas where they are likely to survive. After identifying a promising region, the select rnadom samples and bore narrow ores about as thick as a pencil into hte centers of the trunks. The cores are taken back to Stahle's Tree Ring Laboratory, where they are polished and the tree rings are counted. The largest old-growth ofrest left in the United States consists of ancient blue oaks covering more than 4,000 square miles of the California foothills, Stahle said. But even in the htickly populated eastern United States, more than 2,000 square miles of old-growth woodlands survive to this day, he said. Red oaks near Boston "People used to think there were no ancient trees in the Eastern United States. That is not the case," Stahle said. "The abundance of ancient forest sites strongly controdicts the common misconception that most ancient forests were destroyed by logging and agricultural development." Robert Leverett, executive director of the Friends of theMohawk Trail in Deerfield, Mass., has discovered a 626-year-old black gum tree in New Hampshire. There are 400-year-old red oaks on a Massachusetts mountain in view of the Bost skyline. Only 50 miles north of Manhattan, 500-year-old pitch pines cling to a mountainside in the Hudson River Valley. Farther south, bald cypress trees, 1,500 to 2,000 years old, dwell along North Carolina's Black River. Stands of 900-year-old junipers survive in the Ozark Mountains of Arkansas. About 500 square miles of post oaks up to 400 years old remains in eastern Oklahoma, some only 15 miles from downtown Bulsa. Leverett and Stahle are reluctant to identify the precise locations of old trees, for fear of endangering them. "The Blue Ridge Parkway in Virginia and North Carolina still has many areas of old chestnut oak along the windy ridgelines," Stahle said. "Millions of visitors drive by them every year without realizing the antiquity of these handsome, gnarled old oaks." Most very old trees are found on rugged terrain, arid land or steep slopes unsuitable for development or agriculture. THey are slow-growing, stunted and twisted, and hence were never harvested for lumber. "The ruggedness of the mountainous lands and individual landowner and society preferences allowed for uncut forested spots to slip through the t\cracks in almost originl condition," Leverett said. "As a result, pockets of old-growth forestsin New ENgland survive today in approximately the condition we might have witnessed before Europeans came to the shores of New England in the 1600s." Rings tell a tale Tree rings tend to be wider in years of plentiful moisutre and narrower in dry years. The patterns closely match human records of rainfall and can be used to fill in the blanks before people began to keep weather data. The annual rings show the impact of climate on human history. For example, the driest single year in records covering 800 years along the eastern coast of North America was 1587. That was the year when both Sir Walter Raleigh's "Lost Colony," on what is now Roanoke Island, N.C., disappeared and Spanish colonists abandoned their Santa Elena settlement on Parris Isaldn off South Carolina. In the American Southwest, the decade-long Dust Bowl drought of the 1930s was the worst in the last 500 years of tree-ring records. Years of more than normal rain created overly optimistic expectations early in the 20th century, leading to excessive development in the West, including assigning more water from the Colorado River for cities and farms than could be sustained in dry times. Scientists hope that understanding the cycle of wet and dry weather, preserved in the tree rings of ancient forests, can help rpevent such mistakes. "In terms of science, the old forests provide living laboratories for researchers to study," Leverett said. Posted as a courtesy by Daniel B. Wheeler www.oregonwhitetruffles.com |
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