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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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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DOI: https://doi.org/10.1023/A:1013024603959