Disruption of calcium nutrition at Hubbard Brook Experimental Forest (New Hampshire) alters the health and productivity of red spruce and sugar maple trees and provides lessons pertinent to other sites and regions

摘要: Pollution-induced acidification and other anthropogenic factors are leaching calcium (Ca) mobilizing aluminum (Al) in many forest soils. Because Ca is an essential nutrient Al a potential toxin, resulting depletions of increases available may significantly alter the health productivity trees. Controlled experiments on red spruce (Picea rubens Sarg.) sugar maple (Acer saccharum Marsh.) seedlings--species experiencing decline field--have documented physiological disruptions specific to deficiency. More importantly, field studies at Hubbard Brook Experimental Forest (HBEF) New Hampshire have shown that additions increase soil levels those estimated exist prior pollutant-induced leaching, reverse symptoms decline.