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Effects of mild winter freezing on soil nitrogen and carbon dynamics in a northern hardwood forest

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Abstract

Overwinter and snowmelt processes are thought to be critical to controllersof nitrogen (N) cycling and retention in northern forests. However, therehave been few measurements of basic N cycle processes (e.g.mineralization, nitrification, denitrification) during winter and littleanalysis of the influence of winter climate on growing season N dynamics.In this study, we manipulated snow cover to assess the effects of soilfreezing on in situ rates of N mineralization, nitrification and soilrespiration, denitrification (intact core, C2H2 – based method),microbial biomass C and N content and potential net N mineralization andnitrification in two sugar maple and two yellow birch stands with referenceand snow manipulation treatment plots over a two year period at theHubbard Brook Experimental Forest, New Hampshire, U.S.A. The snowmanipulation treatment, which simulated the late development of snowpackas may occur in a warmer climate, induced mild (temperatures >−5 °C) soil freezing that lasted until snowmelt. The treatmentcaused significant increases in soil nitrate (NO3 )concentrations in sugar maple stands, but did not affect mineralization,nitrification, denitrification or microbial biomass, and had no significanteffects in yellow birch stands. Annual N mineralization and nitrificationrates varied significantly from year to year. Net mineralization increasedfrom ∼12.0 g N m−2 y−1 in 1998 to ∼22 g N m−2 y−1 in 1999 and nitrification increased from ∼8 g N m−2 y−1 in 1998 to ∼13 g N m−2 y−1 in 1999.Denitrification rates ranged from 0 to 0.65 g N m−2 y−1. Ourresults suggest that mild soil freezing must increase soil NO3 levels by physical disruption of the soil ecosystem and not by direct stimulation of mineralization and nitrification. Physical disruption canincrease fine root mortality, reduce plant N uptake and reduce competitionfor inorganic N, allowing soil NO3 levels to increase evenwith no increase in net mineralization or nitrification.

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Correspondence to Peter M. Groffman.

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Groffman, P.M., Driscoll, C.T., Fahey, T.J. et al. Effects of mild winter freezing on soil nitrogen and carbon dynamics in a northern hardwood forest. Biogeochemistry 56, 191–213 (2001). https://doi.org/10.1023/A:1013024603959

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