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- W2169350000 abstract "Export of microbially produced nitrate from an ecosystem is expected to increase δ 15 N in the remaining soil organic matter and NH 4 + . To test the hypothesis that nitrification and nitrate loss induced by clear-cutting cause an increase in soil and foliar δ 15 N, we measured δ 15 N in a clear-cut watershed at the Hubbard Brook Experimental Forest, New Hampshire. δ 15 N ranged from 0.02 in the Oie horizon to 7.7 in the Bs2 horizon prior to clear-cutting and increased significantly by 1.3 in the Oie horizon and 0.9 in the Oa horizon 3 years after clear-cutting. Fifteen years after clear-cutting, δ 15 N in both O horizons decreased to near-initial values. No significant temporal changes in the Bs2 and C horizons δ 15 N were observed. Foliar δ 15 N was highest (1.7) the first 2 years after clear-cutting and was significantly higher than in the reference watershed (mean δ 15 N = 1.2), decreasing to 0.0 35 years after clear-cutting and to 1.3 911 years after clear-cutting. Increased foliar δ 15 N coincided with increased stream-water nitrate concentration, suggesting that the increased nitrification responsible for elevated stream-water nitrate may also have caused an enrichment of the plant-available ammonium pool. The response observed in this catchment also suggests that sampling of soil or foliar δ 15 N may provide a practical alternative to long time series of stream chemistry for evaluating nitrogen saturation of forested ecosystems." @default.
- W2169350000 created "2016-06-24" @default.
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- W2169350000 date "2002-07-01" @default.
- W2169350000 modified "2023-09-25" @default.
- W2169350000 title "Response of the natural abundance of <sup>15</sup>N in forest soils and foliage to high nitrate loss following clear-cutting" @default.
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- W2169350000 doi "https://doi.org/10.1139/x02-041" @default.
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