Assessing the Possibility of a Link Between Acid Precipitation and Decreased Growth Rates of Trees in the Northeastern United States

Stoneham

1984

S. 81-95

24. Lit. Ang.

Bandaufführung

78837

This chapter presents evidence from tree ring studies and pertinent biogeochemical data. Clear, widespread and sustained decreases in tree growth rate beginning in the last 2-3 decades are documented. Pitch pine (Pinus rigida) and shortleaf pine (Pinus echinata) are affected in southern New Jersey, and red spruce in Vermont. Growth of pitch and shortleaf pine in New Jersey, and pitch pine, white pine (Pinus strobus) and chestnut oak (Quercus pinus) in the Shawangunk Mountains of New York show an incrase in the sensitivity of growth to temperature and moisture beginning in the 1950s. Thus, the appearance or strengthening of some regional-scale stress is suggested. Focusing solely on acid precipitation as a possible cause would be restrictive, since there is a possibility of combined or synergistic effects of the many biotic and abiotic stresses acting on forests.