Evidence details

rebecca.killalea@canberra.edu.au on 02 Mar 2022

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Citation: Nidzgorski, D. A., & Hobbie, S. E. (2016). Urban trees reduce nutrient leaching to groundwater. Ecological Applications.
Study description: This study investigated the leaching of nutrients under trees and turfgrass. The study assessed the effectiveness of urban trees to reduce nutrient leaching and therefore reduce the nutrients reaching groundwater and downstream waterbodies.

Cause term/trajectory: Habitat (physical characteristics)
Cause description: Urban trees in landscape compared with turfgrass
Effect term/trajectory: Sediment quality - nutrients (nitrogen)
Effect description: The data from this study did not provide a clear answer on whether urban trees decrease nitrogen leaching compared with turfgrass. The difference varied between an increase and decrease across the time series.
Response measure type: Other
Response measure description: Response measure: quantile regression.

Source data: Field
Study type: Observation
Study design: Temporal gradient
Number of independent control or reference sampling units: 33
Sample size used in analysis: varied between sites
Design description: 3 vegetation types assessed: turfgrass (7 sites), deciduous trees (23 sites), evergreen trees (10 sites) - each were sampled biweekly between July 2011 and October 2013 when soil was wet enough. This resulted in varied sample sizes between vegetation types.