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Influence of Edaphic Factors on Sugar Maple Nutrition and Health on the Allegheny Plateau

^a USDA Forest Service, Northeastern Research Station, 234 Mirror Lake Rd, Campton, NH 03223
^b USDA Forest Service, Northeastern Research Station, Irvine, PA 16365
^c USDA Forest Service, Northeastern Research Station, Delaware, OH 43015
^d USDA Forest Service, Northeastern Research Station, Durham, NH 03824

View larger version (24K): [in a new window]   Fig. 1. Location of study sites in northwestern Pennsylvania and southwestern New York. The broken line represents the southern extent of Pleistocene glaciation. Study sites: AK, Akeley; BH, Baldwin Hollow; BO, Boutwell Hill; BT, Brooks Trail; CL, Clymer; CO; Costello; CP, Colton Point; DH, Dodge Hollow; HH, Hemlock Hollow; HR, Hardwood Ridge Trail; ID, Indian Doctor; KA, Kane Experimental Forest; LV, Little Valley; MC, Mill Creek; ON, Onoville; RB, Red Bridge; RC, Russell City; SR, Sugar Run; TB, Tanbark Trail.

View larger version (26K): [in a new window]   Fig. 2. Exchangeable Ca and Mg (expressed as a percentage of saturation value) in the Oa/A, upper B and lower B horizons vs. sugar maple mortality (percentage of standing dead basal area). Open circles represent stands where defsev10 was less than four; filled circles are stands where defsev10 was four or higher. Note the x-axes are on a log scale.

View larger version (44K): [in a new window]   Fig. 3. Schematic cross sections of (a) unglaciated and (b) glaciated portions of the Allegheny Plateau. Patterned areas represent interbedded sandstone, siltstone, and shale bedrock. Soils on the unglaciated portion are developed in relatively thick, weathered residuum, colluvium, and alluvium shown as the unpatterned area above the bedrock. Arrows suggest general directions of water flow in unglaciated soils and bedrock. Soils on the glaciated portion are developed in relatively unweathered glacial till and outwash.