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Evaluating the effectiveness of urban trees to mitigate storm water runoff via transpiration and stemflow

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Abstract

Many cities in the Eastern United States are working to increase urban tree cover due to the hydrological services that trees provide, including the interception, storage and transpiration of water that would otherwise enter sewer systems. Despite the understanding that trees benefit urban ecosystems, there have been few studies that address the underlying physiology of different urban trees with regard to their capacity to take up water, particularly following rain events. We monitored the sap flow of nine species of trees in urban parks and linked sap flow to local microclimate. In addition, we measured throughfall, stemflow and crown architecture. Interspecific variation in sap flow was significant as were differences in time lags (i.e. difference in time between the increase of solar radiation versus sap flow) across species of large but not small trees. Interestingly the most important microclimatic drivers of sap flow were different in large versus small trees. Lastly, we found that trees with a large branch angle routed more rainwater to stemflow. In this study we found strong evidence that variation in urban tree physiology can impact important hydrological services that will influence the effectiveness of different trees as tools to manage stormwater runoff.

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Acknowledgements

The authors would like to thank the City of Lancaster (Department of Public Works, in particular Karl Greybill) and the Lancaster County Conservancy (Fritz Schroeder) for supporting this work. The authors would like to acknowledge SGG’s students from her Ecophysiology Seminar Course: Rai Abdulhusein, Max Aleman, Rob King, Kate Leibow, Molly Lowell, Julia Rosenwald, Sucel Sanchez and Ryan Stull for help constructing stem flow and throughfall gauges and for help deploying sensors in Buchanan Park. We also acknowledge Lex Darby for his help with experimental installation, data collection and site maintenance. This work was funded by Franklin and Marshall College.

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SGG formulated the ideas resulting in the research. SGG and her students constructed and deployed the sensors. DD conducted statistical and modeling analyses and contributed text regarding those analyses. CW installed and maintained the weather station and contributed text regarding the meteorological measurements. SGG wrote the manuscript. All authors edited the manuscript.

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Correspondence to Sybil G. Gotsch.

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Gotsch, S.G., Draguljić, D. & Williams, C.J. Evaluating the effectiveness of urban trees to mitigate storm water runoff via transpiration and stemflow. Urban Ecosyst 21, 183–195 (2018). https://doi.org/10.1007/s11252-017-0693-y

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