Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.5194/hess-14-279-2010
Titel (primär) Implementing small scale processes at the soil-plant interface - the role of root architectures for calculating root water uptake profiles
Autor Schneider, C.L.; Attinger, S.; Delfs, J.-O.; Hildebrandt, A.
Quelle Hydrology and Earth System Sciences
Erscheinungsjahr 2010
Department CHS; ENVINF
Band/Volume 14
Heft 2
Seite von 279
Seite bis 289
Sprache englisch
Abstract In this paper, we present a stand alone root water uptake model called aRoot, which calculates the sink term for any bulk soil water flow model taking into account water flow within and around a root network. The boundary conditions for the model are the atmospheric water demand and the bulk soil water content. The variable determining the plant regulation for water uptake is the soil water potential at the soil-root interface. In the current version, we present an implementation of aRoot coupled to a 3-D Richards model. The coupled model is applied to investigate the role of root architecture on the spatial distribution of root water uptake. For this, we modeled root water uptake for an ensemble (50 realizations) of root systems generated for the same species (one month old Sorghum). The investigation was divided into two Scenarios for aRoot, one with comparatively high (A) and one with low (B) root radial resistance. We compared the results of both aRoot Scenarios with root water uptake calculated using the traditional Feddes model. The vertical rooting density profiles of the generated root systems were similar. In contrast the vertical water uptake profiles differed considerably between individuals, and more so for Scenario B than A. Also, limitation of water uptake occurred at different bulk soil moisture for different modeled individuals, in particular for Scenario A. Moreover, the aRoot model simulations show a redistribution of water uptake from more densely to less densely rooted layers with time. This behavior is in agreement with observation, but was not reproduced by the Feddes model.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=10485
Schneider, C.L., Attinger, S., Delfs, J.-O., Hildebrandt, A. (2010):
Implementing small scale processes at the soil-plant interface - the role of root architectures for calculating root water uptake profiles
Hydrol. Earth Syst. Sci. 14 (2), 279 - 289 10.5194/hess-14-279-2010