Water balance and tree water use dynamics in remnant urban reserves

Marchionni, Valentina; Guyot, Adrien; Tapper, Nigel; Walker, Jeffrey P.; Daly, Edoardo

doi:10.1016/j.jhydrol.2019.05.022

Cited by 17 publications

(19 citation statements)

References 60 publications

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“…Simulations indicated that woody plants overall transpired more (+42% at National Drive, i.e., 388 mm year −1 , and +90% at Alex Wilkie, i.e., 188 mm year −1 , Figure 5) in scenarios where the WT depth was maintained within the reach of the plant roots. This was experimentally confirmed at the two study sites, where shallow WT depths were found to support transpiration during dry months as well as hot days and nights (Marchionni et al, 2019). The fact that groundwater represents such a large source of the water needed for trees is consistent with the results from previous studies on groundwater-dependent vegetation.…”

Section: Dependence On Groundwatersupporting

confidence: 89%

“…The two reserves host predominantly native plants, with some introduced species, but differ in terms of vegetation structure and soil characteristics. Because a detailed description of the sites is already provided in Marchionni et al (2019), only a brief summary is reported here.…”

Section: Sites and Data Descriptionmentioning

confidence: 99%

“…Sap flux density (SFD, cm 3 cm −2 hr −1 ) was measured at half-hourly intervals in four trees in each site using commercially available sap flow sensors (SFM1, ICT International, Australia) between February 2017 and April 2018. SFD measurements were scaled up to estimate the total transpiration for each reserve (Marchionni et al, 2019).…”

Section: 1029/2019wr026192mentioning

confidence: 99%

“…While the role of urban trees in providing ecosystem services is well documented (Chiesura, 2004;Dobbs et al, 2014;Livesley et al, 2016;Song et al, 2018;Richards & Thompson, 2019;Tyrväinen et al, 2005), less is known about their response to environmental changes. In particular, groundwater-supported trees might cope with short-term droughts and hotter temperatures (Drake et al, 2018;Marchionni et al, 2019) better than with long-term groundwater storage declines due to climate shifts or direct anthropogenic manipulations (Eamus et al, 2015;Kløve et al, 2014). Investigating the interactions and feedback between WT dynamics and terrestrial vegetation becomes crucial for managing and maintaining healthy urban ecosystems and in gaining an understanding of possible impacts on land surface fluxes (Naumburg et al, 2005;Orellana et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Groundwater Buffers Drought Effects and Climate Variability in Urban Reserves

Marchionni

Daly

Manoli

et al. 2020

Water Resources Research

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Groundwater can have a critical role in sustaining the functioning of natural ecosystems during droughts, especially in dry and seasonally dry climates. However, the response to droughts of ecosystems embedded in urban areas is not well known. This study investigates how different scenarios of groundwater availability control the water balance and vegetation productivity of two urban reserves hosting native vegetation in the Melbourne metropolitan area, Australia. Using a mechanistic ecohydrological model supported by field observations, long-term simulations were run to explore the impact of groundwater flow on water, carbon, and energy fluxes under present climatic conditions, including the Millennium Drought (2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009), and in response to perturbations in key environmental variables (air temperature, atmospheric CO 2 concentrations, and rainfall). It was found that the presence of a water table and its capillary fringe within the root depths supports ecosystem transpiration and vegetation productivity. The effects of declining groundwater were found to be more severe in predominantly sandy soils because of the lower water holding capacity, identifying that the water status of vegetation differs significantly depending on soil type. Differences in rooting strategies and groundwater availability also had a pivotal role in helping plants soften the impacts of increased air temperature (T a ) and make use of higher atmospheric CO 2 concentrations. Increased T a strongly affected evapotranspiration, enhancing the competition for water between different vegetation types. These results provide quantitative insights of how vegetation responds to groundwater depletion and climate variability, highlighting the essential role of groundwater resources in urban ecosystems characterized by seasonally dry climates.

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Section: Dependence On Groundwatersupporting

confidence: 89%

Section: Sites and Data Descriptionmentioning

confidence: 99%

Section: 1029/2019wr026192mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Groundwater Buffers Drought Effects and Climate Variability in Urban Reserves

Marchionni

Daly

Manoli

et al. 2020

Water Resources Research

Self Cite

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“…This means that the link between the water table dynamics and transpiration must be correctly modeled. This relationship has been shown in many studies, both experimentally (Vincke and Thiry, 2008;Benyon et al, 2006, Marchionni et al, 2019 and using numerical models (Loheide et al, WRR 2005). In many areas in the southern part of Australia, trees can grow roots to several meters to tap the capillary fringe at large depths.…”

Section: Interactive Commentmentioning

confidence: 55%

Response to Anonymous Referee #1

Gelsinari¹

2020

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Estimates of water partitioning in complex urban landscapes with isotope‐aided ecohydrological modelling

Gillefalk

Tetzlaff

Marx

et al. 2022

Hydrological Processes

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Urban green space is increasingly viewed as essential infrastructure to build resilience to climate change by retaining water in the city landscape and balancing ecohydrological partitioning into evapotranspiration for cooling and groundwater recharge. Quantifying how different vegetation types affect water partitioning is essential for future management, but paucity of data and the complex heterogeneity of urban areas make water balance estimates challenging. Here, we provide a preliminary assessment of water partitioning from different sized patches of trees and grass as well as from sealed surfaces. To do this, we used limited field observations together with an advanced, process‐based tracer‐aided ecohydrological model at a meso‐scale (5 km2) in central Berlin, Germany. Transpiration was the dominant green water flux accounting for over 50% of evapotranspiration in the modelled area. Green water fluxes were in general greater from trees compared with grass, but grass in large parks transpired more water compared with grass in small parks that were intensively used for recreation. Interception evaporation was larger for trees compared with grass, but soil water evaporation was greater for grass compared with trees. We also show that evapotranspiration from tree‐covered areas comprise almost 80% of the total evapotranspiration from the whole model domain while making up less than 30% of the surface cover. The results form an important stepping‐stone towards further upscaling over larger areas and highlights the importance of continuous high‐resolution hydrological measurements in the urban landscape, as well as the need for improvements to ecohydrological models to capture important urban processes.

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Water balance and tree water use dynamics in remnant urban reserves

Cited by 17 publications

References 60 publications

Groundwater Buffers Drought Effects and Climate Variability in Urban Reserves

Groundwater Buffers Drought Effects and Climate Variability in Urban Reserves

Response to Anonymous Referee #1

Estimates of water partitioning in complex urban landscapes with isotope‐aided ecohydrological modelling

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