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Vertical transport of dissolved organic C and N under long-term N amendments in pine and hardwood forests

Biogeochemistry volume 35, pages 471–505 (1996)Cite this article

Abstract

At the Harvard Forest, Massachusetts, a long-term effort is under way to study responses in ecosystem biogeochemistry to chronic inputs of N in atmospheric deposition in the region. Since 1988, experimental additions of NH4NO3 (0, 5 and 15 g N m−2 yr−1) have been made in two forest stands:Pinus resinosa (red pine) and mixed hardwood. In the seventh year of the study, we measured solute concentrations and estimated solute fluxes in throughfall and at two soil depths, beneath the forest floors (Oa) and beneath the B horizons.

Beneath the Oa, concentrations and fluxes of dissolved organic C and N (DOC and DON) were higher in the coniferous stand than in the hardwood stand. The mineral soil exerted a strong homogenizing effect on concentrations beneath the B horizons. In reference plots (no N additions), DON composed 56% (pine) and 67% (hardwood) of the total dissolved nitrogen (TDN) transported downward from the forest floor to the mineral soil, and 98% of the TDN exported from the solums. Under N amendments, fluxes of DON from the forest floor correlated positively with rates of N addition, but fluxes of inorganic N from the Oa exceeded those of DON. Export of DON from the solums appeared unaffected by 7 years of N amendments, but as in the Oa, DON composed smaller fractions of TDN exports under N amendments. DOC fluxes were not strongly related to N amendment rates, but ratios of DOC:DON often decreased.

The hardwood forest floor exhibited a much stronger sink for inorganic N than did the pine forest floor, making the inputs of dissolved N to mineral soil much greater in the pine stand. Under the high-N treatment, exports of inorganic N from the solum of the pine stand were increased >500-fold over reference (5.2 vs. 0.01 g N m−2 yr−1), consistent with other manifestations of nitrogen saturation. Exports of N from the solum in the pine forest decreased in the order NO3-N> NH4-N> DON, with exports of inorganic N 14-fold higher than exports of DON. In the hardwood forest, in contrast, increased sinks for inorganic N under N amendments resulted in exports of inorganic N that remained lower than DON exports in N-amended plots as well as the reference plot.

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Author notes

  1. Richard D. Boone

    Present address: Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, 99775

  2. William S. Currie

    Present address: The Ecosystems Center, Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA, 02543-1015

Authors and Affiliations

  1. Complex Systems Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, 03824-3525

    William S. Currie, John D. Aber & Alison H. Magill

  2. Department of Natural Resources, University of New Hampshire, Durham, NH, 03824

    William H. McDowell

  3. Harvard Forest, P.O. Box 68, Petersham, MA, 01366

    Richard D. Boone

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  1. William S. Currie
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  4. Richard D. Boone
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  5. Alison H. Magill
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Currie, W.S., Aber, J.D., McDowell, W.H. et al. Vertical transport of dissolved organic C and N under long-term N amendments in pine and hardwood forests. Biogeochemistry 35, 471–505 (1996). https://doi.org/10.1007/BF02183037

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