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

Content Provider	Springer Nature Link
Author	Trammell, T. L. E. Tripler, C. E. Carper, S. C. Carreiro, M. M.
Copyright Year	2016
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.
Starting Page	77
Ending Page	86
Page Count	10
File Format	PDF
ISSN	10838155
Journal	Urban Ecosystems
Volume Number	20
Issue Number	1
e-ISSN	15731642
Language	English
Publisher	Springer US
Publisher Date	2016-07-07
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Urban-rural gradients Forests Urban heat island Temperature Nitrogen cycling Potential N mineralization Urban Ecology Environmental Management Ecology Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Ecology Urban Studies

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