Marchionni, V;
Daly, E;
Manoli, G;
Tapper, NJ;
Walker, JP;
Fatichi, S;
(2020)
Groundwater Buffers Drought Effects and Climate Variability in Urban Reserves.
Water Resources Research
, 56
(5)
, Article e2019WR026192. 10.1029/2019wr026192.
Preview |
Text
2019WR026192.pdf - Published Version Download (13MB) | Preview |
Abstract
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 (2001–2009), and in response to perturbations in key environmental variables (air temperature, atmospheric CO2 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 (Ta) and make use of higher atmospheric CO2 concentrations. Increased Ta 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.
| Type: | Article |
|---|---|
| Title: | Groundwater Buffers Drought Effects and Climate Variability in Urban Reserves |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1029/2019wr026192 |
| Publisher version: | https://doi.org/10.1029/2019wr026192 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | urban reserves, cities, groundwater‐dependent ecosystems, ecohydrology |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10097389 |
Archive Staff Only
 |
View Item |
