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Potential nitrogen mineralization responses of urban and rural forest soils to elevated temperature in Louisville, KY

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Abstract

Soil nitrogen (N) mineralization is an important process determining terrestrial N availability, and evidence suggests elevated temperatures will enhance N mineralization rates. Along a 40 km urban-rural gradient of chestnut oak forest stands in Louisville, KY, we expected N mineralization rates would be higher in urban than in rural forests in part due to increased temperatures caused by the urban heat island. However, a 12-month field study along this Louisville gradient showed that annual N mineralization rates were lower in urban than in rural stands. Since variation in precipitation inputs and other factors across this land-use gradient may be influencing soil N mineralization rates, we conducted a three-month soil incubation experiment in the lab to determine the extent to which a + 2 °C temperature difference could affect soil N mineralization in urban and rural soils. Across the range of temperatures tested, rural soils mineralized N at twice the rate of urban soils under base (7.86 vs. 3.65 mg N kg−1 AFDW soil d−1) and elevated (9.08 vs. 4.76 mg N kg−1 AFDW soil d−1) temperatures (p < 0.01). A 2 °C temperature difference, did not significantly alter total inorganic N production in urban (p = 0.272) or rural soils (p = 0.293). The proportion of nitrate produced was lower in the urban (15.1 %) than in the rural soils (72.3 %; p < 0.01). These results suggest that differences in soil organic matter quality and potentially decomposer community composition are the primary explanatory factors for forests along this Louisville gradient.

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Acknowledgments

The University of Louisville Research Foundation supported this study. We thank Chad Ladusaw and Juliane Amlacher for field and laboratory assistance and Rich Schultz for soil nitrogen analysis. We also thank Louisville Metro Parks and the Bernheim Arboretum and Research Forest for permission to conduct research in urban and rural forests, respectively.

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Correspondence to T. L. E. Trammell.

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Trammell, T.L.E., Tripler, C.E., Carper, S.C. et al. Potential nitrogen mineralization responses of urban and rural forest soils to elevated temperature in Louisville, KY. Urban Ecosyst 20, 77–86 (2017). https://doi.org/10.1007/s11252-016-0580-y

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