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| Titel |
Rooting depths regulate the global water cycle |
| VerfasserIn |
Gonzalo Míguez-Macho, Ying Fan |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250154422
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| Publikation (Nr.) |
 EGU/EGU2017-19515.pdf |
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| Zusammenfassung |
| Ecosystem productivity and evapotranspiration fluxes are fundamental
regulators of the global carbon and water cycles. Where and how much
plants grow is largely determined by atmospheric conditions and soil
water availability. It is the reliance of ecosystems on soil water
that links their fate tightly to precipitation and groundwater reach.
Here, we explore the controls on plant root uptake imposed by climate
at the large scale and by groundwater accessibility at the local
drainage scale, aiming to untangle the spatial and temporal global
patterns of rain-fed and groundwater-fed ecosystems. To this end, we
use observed atmospheric and productivity conditions to model the
seasonal evolution of root uptake and soil moisture profiles and their
coupling to the water table, with a global groundwater-soil-vegetation
framework at the 1km resolution. Results indicate highly variable
uptake-depth across seasonal and local hydrologic gradients, and a far
more common occurrence of deep (>5m) uptake than previous thought.
Implications to future environmental change are briefly
discussed. |
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