A Comparison of Chemical Weathering in Schist-dominated vs. Granite-dominated Watersheds; Implications for Forest Health in Vermont and New Hampshire

Basic Information
Author: Berkman, D. A., Zummo, L., Ryan, P. C.
Description:A Comparison of Chemical Weathering in Schist-dominated vs. Granite-dominated Watersheds; Implications for Forest Health in Vermont and New Hampshire. Geological Society of America, Northeastern Section, 42nd Annual Meeting (12-14 March 2007), Paper 48-19. Abstract: While much is known about the impacts of acid deposition, lingering questions remain regarding weathering rates and buffering capacities of different types of soils. Tills derived from schist and granite are two common parent materials for soils in northern New England, so we designed a study to examine soil parameters in a lithosequence where the primary difference in soil-forming factors is parent material-specifically, we studied till derived from schist (Cambrian Underhill Formation) in northern Vermont on Bolton Mountain and granite (Devonian New Hampshire Series) in central New Hampshire at the USFS Bartlett Experimental Forest. Other soil forming factors are very similar between the two sites. The forest at both sites is dominated by mixed hardwood that transitions upward to spruce fir. Topography consists of gently- to moderately-sloping till plains and soils at both sites began forming approximately 10 ka. Notable mineralogical differences exist between the two sites. Because of its abundance and reactivity, plagioclase weathering is the dominant mineralogical control on soil geochemistry, a finding that is consistent with work of Hyman et al (1998), who show that, even in soils with appreciable amounts of reactive phyllosilicates like chlorite and mica, plagioclase weathering controls response to acid deposition in New England soils.
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Author Contact Information
Distributor Contact Information
Name: Marjorie Gale
Organization Name: Vermont Agency of Natural Resources
Street: 1 National Life Dr
City: Montpelier
State: VT
Zip: 05671-2420
Phone: 802-654-5210
Geographic Extent
North Bounding Latitude: 45.01674
South Bounding Latitude: 42.727119
East Bounding Longitude: -71.465282
West Bounding Longitude: -73.437903