gray birch


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Synonyms for gray birch

medium-sized birch of eastern North America having white or pale grey bark and valueless wood

References in periodicals archive ?
Expressed as a percentage of aboveground growth in the CLEAR treatment, shoot mass in the INTACT treatment was 0.09-0.3% for gray birch, 1.9-2.0% for red maple, and 25-28% for sugar maple.
Gray birch CLEAR 66.9 46.7 90.4 22.7 INTACT 4.2 43.0 8.9 85.7
Gray birch CLEAR 33.47 81.3 38.82 46.2 INTACT 0.03 90.4 0.12 192.1
Gray birch CLEAR 7.7 126.6 4.1 69.0 INTACT 384.7 64.0 275.8 49.8
The degree of etiolation accorded with the [TABULAR DATA FOR TABLE 3 OMITTED] species' relative shade tolerance, gray birch being the most plastic (INTACT etiolation 50-67 fold greater than in the CLEAR plots), followed by red maple (9-10 fold increase) and sugar maple (threefold increase).
Negative effects on gray birch were virtually complete (i.e., competitive intensity (C.I.) = 1) in the shrub communities and several of the herbaceous communities.
Gray birch +.272 0.23 -.003 0.99 Red maple +.782 0.001 -.125 0.59 Sugar maple +.515 0.017 +.201 0.38 Net vegetation effects on survival
The species ranked as before, with survival in the INTACT treatment (expressed as a percentage of that in the CLEAR plots) ranging from 18 to 21% for gray birch, 73 to 133% for red maple and 95 to 246% for sugar maple (Table 6).
Gray birch CLEAR .479 60.8 .477 49.5 INTACT .088 129.7 .101 93.0
Gray birch seedling survival was inhibited by intact vegetation in virtually all of the sites, regardless of community type or biomass of the surrounding community [ILLUSTRATION FOR FIGURE 5 OMITTED].
The clear exception was the 1988 cohort of gray birch, where the intensity of competition increased directly with site quality (regression analysis: [R.sup.2] = 72.1%, P [less than] 0.001).