Interacting drivers and their tradeoffs for predicting denitrification potential across a strong urban to rural gradient within heterogeneous landscapes.

Autor: Stephan E; SUNY College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY, 13210, USA. Electronic address: eastepha@syr.edu., Groffman P; CUNY Advanced Science Research Center at the Graduate Center, 85 St. Nicholas Terrace, 5th Floor, New York, NY, 10031, USA; Cary Institute of Ecosystem Studies, Box AB, Millbrook, NY, 12545, USA. Electronic address: pgroffman@gc.cuny.edu., Vidon P; SUNY College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY, 13210, USA. Electronic address: pgvidon@esf.edu., Stella JC; SUNY College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY, 13210, USA. Electronic address: stella@esf.edu., Endreny T; SUNY College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY, 13210, USA. Electronic address: te@esf.edu.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2021 Sep 15; Vol. 294, pp. 113021. Date of Electronic Publication: 2021 Jun 14.
DOI: 10.1016/j.jenvman.2021.113021
Abstrakt: Denitrification is a significant regulator of nitrogen pollution in diverse landscapes but is difficult to quantify. We examined relationships between denitrification potential and soil and landscape properties to develop a model that predicts denitrification potential at a landscape level. Denitrification potential, ancillary soil variables, and physical landscape attributes were measured at study sites within urban, suburban, and forested environments in the Gwynns Falls watershed in Baltimore, Maryland in a series of studies between 1998 and 2014. Data from these studies were used to develop a statistical model for denitrification potential using a subset of the samples (N = 188). The remaining measurements (N = 150) were used to validate the model. Soil moisture, soil respiration, and total soil nitrogen were the best predictors of denitrification potential (R 2 adj  = 0.35), and the model was validated by regressing observed vs. predicted values. Our results suggest that soil denitrification potential can be modeled successfully using these three parameters, and that this model performs well across a variety of natural and developed land uses. This model provides a framework for predicting nitrogen dynamics in varying land use contexts. We also outline approaches to develop appropriate landscape-scale proxies for the key model inputs, including soil moisture, respiration, and soil nitrogen.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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