ISSN:
1573-5036
Keywords:
Acid deposition
;
Acid precipitation
;
Biogeochemistry
;
Carbon cycling
;
Forest soils
;
Inceptisol
;
Microcosms
;
Soil respiration
;
Spodosol
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary This comparative soil microcosm study examined the effects of precipitation acidity on decomposition processes in three contrasting eastern North American forest soils: a Becket series Haplorthod, an Unadilla series Dystrochrept, and an Adams series Haplorthod. Results from all three soils showed that soil respiration is quantitatively unaffected by differences in precipitation acidity over the range of pH 5.7 to 3.5 (annual loading rates of 36 to 5,520 eq H+ · ha−1). Soil respiration did vary as a function of edaphic differences between soils. Data from all three soils also indicated that precipitation acidity (at pH≧3.5 and lime potential ≧1.11) had no consistent quantitative effect upon total dissolved organic carbon leaching. Again, differences in DOC flux were related to inter-soil edaphic variations. Carbon turnover budgets for the three soils indicated that 54–68% of the forest floor carbon loss occurred through respiration, while DOC leaching accounted for the remaining 32–46% of carbon loss. Finally, results from all three soils showed that increased inputs of strong acids to the forest floor caused distinct decreases in the hydrophobic acid (fulvic acid) content of leachate dissolved organic carbon.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02140669
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