BARBETA MARGARIT, Adrià; PEÑUELAS, Josep

doi:10.1038/s41598-017-09643-x

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BARBETA MARGARIT, Adrià
Interactions Sol Plante Atmosphère [UMR ISPA]
Global Ecology Unit CREAF-CSIC-UAB
Centre de Recerca Ecològica i Aplicacions Forestals [CREAF]

PEÑUELAS, Josep
Global Ecology Unit CREAF-CSIC-UAB
Centre de Recerca Ecològica i Aplicacions Forestals [CREAF]

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Scientific Reports. 2017, vol. 7, n° 1, p. 1-10

Nature Publishing Group

Résumé en anglais

Water stored underground in the saturated and subsurface zones below the soil are important sources of water for plants in water-limited ecosystems. The presence of deep-rooted plants worldwide, however, suggests that the use of groundwater is not restricted to arid and seasonally dry ecosystems. We compiled the available data (71 species) on the relative contribution of groundwater to plant water estimated using stable isotopes and mixing models, which provided information about relative groundwater use, and analyzed their variation across different climates, seasons, plant types, edaphic conditions, and landscape positions. Plant use of groundwater was more likely at sites with a pronounced dry season, and represented on average 49 per cent of transpired water in dry seasons and 28 per cent in wet seasons. The relative contribution of groundwater to plant-water uptake was higher on rocky substrates (saprolite, fractured bedrock), which had reduced groundwater uptake when this source was deep belowground. In addition, we found that the connectivity between groundwater pools and plant water may be quantitatively larger and more widespread than reported by recent global estimations based on isotopic averaged values. Earth System Models should account for the feedbacks between transpiration and groundwater recharge.< Réduire

Mots clés

eau souterraine

écosystème

stockage d'eau

transfert sol racine

isotope stable

Mots clés en anglais

groundwater

ecosystem

stable isotopes

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Relative contribution of groundwater to plant transpiration estimated with stable isotopes

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Mots clés en anglais

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