Canopy processing of acidic precipitation by coniferous and hardwood forests in New England

Oecologia ◽  
1983 ◽  
Vol 59 (2-3) ◽  
pp. 216-223 ◽  
Author(s):  
C. S. Cronan ◽  
W. A. Reiners
Keyword(s):  
New England ◽  
Hardwood Forests ◽  
Acidic Precipitation

White pine in the transition hardwood forest

1982 ◽  
Vol 60 (10) ◽  
pp. 2046-2053 ◽  
Author(s):  
David E. Hibbs
Keyword(s):  
New England ◽  
Shade Tolerance ◽  
Slow Growth ◽  
Pinus Strobus ◽  
Hardwood Forests ◽  
White Pine ◽  
Slow Growth Rate ◽  
Pine Seedlings ◽  
Pine Regeneration ◽  
Pine Stands

Eastern white pine (Pinus strobus) in central New England is found in pure stands and as a component of mixed hardwood -pine stands. In older mixed forests, this pine is emergent over the surrounding hardwood canopy. Owing to the only moderate shade tolerance and initial slow growth rate of pine, there has been frequent speculation about how pine could survive and grow in hardwood forests. Results presented here indicate that successful white pine regeneration is achieved (i) by group reproduction in dense hardwood stands (25 m2∙h−1) where the group acts as a buffer around a central and eventually surviving pine; (ii) by single pine seedlings if hardwood competition is not too severe (18 m2∙h−1); (iii) occasionally by advanced regeneration from a previous stand; and, (iv) in mature forests, by regeneration in larger canopy gaps.

Acidic Precipitation in South-Central Ontario: Recent Observations

1978 ◽  
Vol 35 (6) ◽  
pp. 809-815 ◽  
Author(s):  
P. J. Dillon ◽  
D. S. Jeffries ◽  
W. Snyder ◽  
R. Reid ◽  
N. D. Yan ◽  
...  
Keyword(s):  
New England ◽  
Mineral Acid ◽  
Buffering Capacity ◽  
Acidic Precipitation ◽  
South Central ◽  
Frequent Event ◽  
Strong Mineral Acid ◽  
Acidic Rain ◽  
Time Required ◽  
Northeastern Usa

Precipitation in south-central Ontario, with mean pH between 3.95 and 4.38 and frequent event pH's of < 4.0, is more acidic than that in the Sudbury, Ontario, region and in Scandinavia, and as acidic as that in the northeastern USA. As in New England, a major component of the total acidity is strong mineral acid. Because most lakes in south-central Ontario have very low buffering capacities (10–200 μeq∙L−1), high acid loadings are likely to lead to acidification of many lakes and streams in the forseeable future. Although it is not yet possible to estimate the time required for this to happen, there is already some evidence of declining buffering capacity in a few lakes. Key words: acidic rain, buffering capacity, acidic lakes, precipitation, alkalinity

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