Groundwater contribution to transpiration of trees under wet and dry soil conditions*

Tfwala, C.M.; Rensburg, L. van; Bello, Zaid A.

doi:10.1002/ird.2533

Cited by 3 publications

(5 citation statements)

References 35 publications

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“…Incorporating groundwater interactions increases the annual-mean, globally-averaged evaporation by 2.5 mm year −1 . The contribution of groundwater-sourced evaporation is estimated such that it is higher under dry conditions and for tall vegetation, in agreement with previous studies (Balugani et al, 2017;Miguez-Macho & Fan, 2021;Maxwell & Condon, 2016;Tfwala et al, 2021;Barbeta & Peñuelas, 2017). The globally-averaged contribution of groundwater to evaporation in GLEAM-Hydro (f GW = 0.008) is similar to findings by Miguez-Macho and Fan (2021), who estimate that approximately 1% of the global evaporation is sourced from groundwater.…”

Section: Discussionsupporting

confidence: 89%

“…Modelling studies that simulate groundwater-surface interactions typically detect higher groundwater uptake by plant roots under dry conditions (Balugani et al, 2017;Maxwell & Condon, 2016;Lam et al, 2011;Miguez-Macho & Fan, 2021). This is also confirmed with a field experiment by Tfwala et al (2021) who show that under dry conditions, total transpiration decreases while its groundwater contribution increases. Barbeta and Peñuelas (2017) find that the groundwater uptake is independent of the depth to the groundwater table in saturated soils, which is possibly due to the increased water-uptake efficiency of roots (Orellana et al, 2012).…”

Section: Introductionsupporting

confidence: 63%

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Incorporating plant access to groundwater in existing global, satellite-based evaporation estimates

Hulsman

Keune

Koppa

et al. 2022

Preprint

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Groundwater is an important water source for evaporation, especially during dry conditions. Despite this recognition, plant access to groundwater is often neglected in global evaporation models. This study proposes a new, conceptual approach to incorporate plant access to groundwater in existing global evaporation models. To this end, the Global Land Evaporation Amsterdam Model (GLEAM) is used, and the resulting influence of groundwater on global evaporation is assessed. The new GLEAM-Hydro model relies on the linear reservoir assumption for modelling groundwater flow, and introduces a transpiration partitioning approach to estimate groundwater contributions. Model estimates are validated globally against field observations of evaporation, soil moisture, discharge and groundwater level for the time period 2015-2021, and compared to a regional groundwater model. Results indicate only mild improvements in evaporation estimates, as most eddy-covariance stations are located in energy-limited regions or regions with no plant access to groundwater. The temporal dynamics of the simulated evaporation improves across 75% of the stations where groundwater is a relevant water source. The skill of the model for variables such as soil moisture and runoff remains similar to GLEAM v3. Representing groundwater access influences evaporation in 22% of the continental surface, and it increases evaporation globally by 2.5 mm year -1 (0.5% of terrestrial evaporation). The proposed approach enables a more realistic process representation of evaporation under water-limited conditions in satellite-data driven models such as GLEAM, and sets the ground to assimilate satellite gravimetry data in the future.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionsupporting

confidence: 63%

Incorporating plant access to groundwater in existing global, satellite-based evaporation estimates

Hulsman

Keune

Koppa

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…This is also confirmed with a field experiment by Tfwala et al. (2021) who show that under dry conditions, total transpiration decreases while its groundwater contribution increases. Barbeta and Peñuelas (2017) find that the groundwater uptake is independent of the depth to the groundwater table in saturated soils, which is possibly due to the increased water‐uptake efficiency of roots (Orellana et al., 2012).…”

Section: Introductionsupporting

confidence: 87%

“…Modeling studies that simulate groundwater-surface interactions typically detect higher groundwater uptake by plant roots under dry conditions (Balugani et al, 2017;Lam et al, 2011;Maxwell & Condon, 2016;Miguez-Macho & Fan, 2021). This is also confirmed with a field experiment by Tfwala et al (2021) who show that under dry conditions, total transpiration decreases while its groundwater contribution increases. Barbeta and Peñuelas (2017) find that the groundwater uptake is independent of the depth to the groundwater table in saturated soils, which is possibly due to the increased water-uptake efficiency of roots (Orellana et al, 2012).…”

supporting

confidence: 64%

“…This study enables a better understanding of evaporation during water‐stressed conditions by introducing groundwater‐sourced evaporation in a satellite‐based model. The simulated groundwater contribution to transpiration in GLEAM‐Hydro is based on knowledge gained from previous studies (Balugani et al., 2017; Barbeta & Peñuelas, 2017; Maxwell & Condon, 2016; Miguez‐Macho & Fan, 2021; Tfwala et al., 2021); see Section 1. Incorporating groundwater interactions increases the annual‐mean, globally‐averaged evaporation by 2.5 mm year −1 and locally by up to 245.2 mm year −1 .…”

Section: Discussionmentioning

confidence: 99%

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Incorporating Plant Access to Groundwater in Existing Global, Satellite‐Based Evaporation Estimates

Hulsman

Keune

Koppa

et al. 2023

Water Resources Research

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Groundwater is an important water source for evaporation, especially during dry conditions. Despite this recognition, plant access to groundwater is often neglected in global evaporation models. This study proposes a new, conceptual approach to incorporate plant access to groundwater in existing global evaporation models, and analyses the groundwater contribution to evaporation globally. To this end, the Global Land Evaporation Amsterdam Model (GLEAM) is used. The new GLEAM‐Hydro model relies on the linear reservoir assumption for modeling groundwater flow, and introduces a transpiration partitioning approach to estimate groundwater contributions. Model estimates are validated globally against field observations of evaporation, soil moisture, discharge and groundwater level for the time period 2015–2021, and compared to a regional groundwater model. Representing groundwater access influences evaporation in 22% of the continental surface. Globally averaged, evaporation increases by 2.5 mm year−1 (0.5% of terrestrial evaporation), but locally, evaporation can increase up to 245.2 mm year−1 (149.7%). The groundwater contribution to transpiration is highest for tall vegetation under dry conditions due to more frequent groundwater access. The temporal dynamics of the simulated evaporation improve across 75% of the stations where groundwater is a relevant water source. The skill of the model for variables such as soil moisture and runoff remains similar to GLEAM v3. The proposed approach enables a more realistic process representation of evaporation under water‐limited conditions in satellite‐data driven models such as GLEAM, and sets the ground to assimilate satellite gravimetry data in the future.

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Surface and Subsurface Water Impacts of Forestry and Grassland Land Use in Paired Watersheds: Electrical Resistivity Tomography and Water Balance Analysis

de Souza,

de Bastos,

da Cunha Kemerich

et al. 2024

Water

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Global forest plantations are expanding, causing land-use changes and impacting the water cycle. This study assesses whether eucalyptus plantations reduce groundwater levels compared to grasslands in paired subtropical watersheds. The hydrological dynamics of surface and subsurface water were compared in three small watersheds in southern Brazil, mainly occupied by Eucalyptus saligna (Es-W, 79.9 ha), Eucalyptus benthamii (Eb-W, 82.1 ha), and degraded anthropized natural grassland (G-W, 109.4 ha). Rainfall, flow, and piezometric levels were monitored. Runoff, evapotranspiration, and water balance in the soil profile were estimated, and the subsurface environment was characterized using electrical resistivity tomography. During higher accumulated rainfall, water surplus increased for all watersheds. In the wet period (accumulated rainfall of 1098.0 mm), evapotranspiration was higher for eucalyptus (624.3 mm for Eb-W and 512.5 mm for Es-W) than for the grassland watershed (299.5 mm), resulting in the highest runoff in G-W (649.6 mm). During the dry period (accumulated rainfall of 478.5 mm), water deficit and withdrawal were mainly observed in forested watersheds, decreasing groundwater. Combining water balance and electrical resistivity tomography estimations results in a better understanding of the hydrological dynamics in paired watersheds with different land uses. This information is useful for developing best-practice management strategies for sustainable water resource use and forest production.

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Groundwater contribution to transpiration of trees under wet and dry soil conditions*

Cited by 3 publications

References 35 publications

Incorporating plant access to groundwater in existing global, satellite-based evaporation estimates

Incorporating plant access to groundwater in existing global, satellite-based evaporation estimates

Incorporating Plant Access to Groundwater in Existing Global, Satellite‐Based Evaporation Estimates

Surface and Subsurface Water Impacts of Forestry and Grassland Land Use in Paired Watersheds: Electrical Resistivity Tomography and Water Balance Analysis

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