Title: A ten-year regional assessment of sugar maple mortality
Author: Allen, Douglas C.; Molloy, Andrew W.; Cooke, Robert R.; Pendrel, Bruce A.;
Source: In: Horsley, Stephen B.; Long, Robert P., eds. Sugar maple ecology and health: proceedings of an international symposium; 1998 June 2-4; Warren, PA. Gen. Tech. Rep. NE-261. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 27-45.
Publication Series: Other
Description: The North American Maple Project (NAMP) monitored annual sugar maple mortality from 1988 through 1997 in Maine, Massachusetts, New Brunswick/Nova Scotia, New Hampshire, New York. Ontario, Quebec, Vermont, and Wisconsin. Annual mortality in Minnesota, Ohio and Pennsylvania was evaluated for 1992 through 1997. When data from the dominant/codominant and intermediate/suppressed crown levels were combined, average annual mortality (% trees) ranged from 1.9% (New York) to 0.3% (New Brunswick/Nova Scotia) in sugarbushes (SBs) and 1.9% (New Hampshire) to 0.49% (Wisconsin) in maple stands not managed for syrup production (NSBs). In general, mortality of dominant/codominant sugar maple was lower than in the intermediate/suppressed crown position. Average annual mortality was not significantfy different among each of three elevational categories or among each of three deposition levels for wet sulfate or wet nitrate. Mortality in plot-clusters located >300 m elevation and exposed to high levels of wet nitrate (>20 kg/ha/yr) or wet sulfate (>27.5/kg1/ha/yr) deposition was significantly greater in both SBs and NSBs compared to mortality in plot-clusters exposed to high levels of deposition but located <300 elevatron (SB: >300 m 2.2%, <300 m 0.6%: NSB: >300 m 1.1%, <300m 0.3%). A number of small, but statistically significant (p ≤ 0.05), differences in mortality occurred among three ecological Divisions, three Provinces and three Sections in the U.S., and three Ecozones and four Ecoregions in Canada. Within 13 geographic regions (states and provinces), two crown positions, two management categories, three levels of elevation, three deposition levels for both wet nitrate and wet sulfate, and 18 biophysical regions, annual sugar maple mortality documented by the NAMP was similar to mortality reported in the literature for typical northern hardwood stands. Mortality in SBs was similar to that in NSBs.
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Allen, Douglas C.; Molloy, Andrew W.; Cooke, Robert R.; Pendrel, Bruce A. 1999. A ten-year regional assessment of sugar maple mortality. In: Horsley, Stephen B.; Long, Robert P., eds. Sugar maple ecology and health: proceedings of an international symposium; 1998 June 2-4; Warren, PA. Gen. Tech. Rep. NE-261. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 27-45.
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