Soil-solution chemistry in black locust, pine/mixed-hardwoods and oak/hickory forest stands in the southern Appalachians, U.S.A. |
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Authors: | Florencia Montagnini Bruce Haines and Wayne T Swank |
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Institution: | a Institute of Ecology and Botany Department, University of Georgia, Athens, Georgia 30602, U.S.A. b Southeastern Forest Experiment Station, Coweeta Hydrologic Laboratory, Otto, North Carolina 28763, U.S.A. |
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Abstract: | Soil-solution chemistry was measured over a 15-month period in three forest stands of contrasting nitrogen mineralization and nitrification rates in the southern Appalachians of North Carolina, U.S.A., using porous-cup lysimeters. In a black-locust-dominated stand, soil solution NO3---N was 3.73 and 5.04 mg l?1 at 30- and 60-cm depth respectively, and dissolved organic N (
) was 0.718 and 0.582 mg l?1 respectively. Values at 30 and 60 cm for a pine/mixed-hardwood stand were 0.032 and 0.058 mg l?1 NO3---N, and 0.201 and 0.168 mg l?1
(values are means over the whole duration of the study). At both depths, soil solution conductivity, pH, Ca, Mg, K and PO4---P were higher in black locust than in pine/mixed-hardwoods, and there were no differences in soil solution Na. In an oak/hickory stand, soil solution NO3---N at 30-cm depth was 0.008 mg l?1, and
was 0.357 mg l?1. At 30-cm depth, soil-solution conductivity, Ca, Mg and PO4---P were higher in black locust than in oak-hickory, with no differences in pH, K and Na;
, pH and K were higher in oak/hickory than in pine/mixed-hardwoods. In the oak/hickory and pine/mixed-hardwoods forest stands, with relatively lower soil N turnover rates,
was a major portion of soil solution N. |
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