 |
| Titel |
Implementing small scale processes at the soil-plant interface – the role of root architectures for calculating root water uptake profiles |
| VerfasserIn |
C. L. Schneider, S. Attinger, J.-O. Delfs, A. Hildebrandt |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 14, no. 2 ; Nr. 14, no. 2 (2010-02-12), S.279-289 |
| Datensatznummer |
250012182
|
| Publikation (Nr.) |
 copernicus.org/hess-14-279-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|