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Implementing Small Scale Processes at the Soil-plant Interface – the Role of Root Architectures for Calculating Root Water Uptake Profiles : Volume 14, Issue 2 (12/02/2010)

By Schneider, C. L.

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Book Id: WPLBN0003982094
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Implementing Small Scale Processes at the Soil-plant Interface – the Role of Root Architectures for Calculating Root Water Uptake Profiles : Volume 14, Issue 2 (12/02/2010)  
Author: Schneider, C. L.
Volume: Vol. 14, Issue 2
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Delfs, J., Attinger, S., Hildebrandt, A., & Schneider, C. L. (2010). Implementing Small Scale Processes at the Soil-plant Interface – the Role of Root Architectures for Calculating Root Water Uptake Profiles : Volume 14, Issue 2 (12/02/2010). Retrieved from http://hawaiilibrary.net/


Description
Description: Helmholtz Centre for Environmental Research – UFZ, Department of Computational Hydrosystems, Leipzig, Germany. 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.

Summary
Implementing small scale processes at the soil-plant interface – the role of root architectures for calculating root water uptake profiles

Excerpt
\v Sim{\r u}nek, J. and Hopmans, J. W.: Modeling compensated root water and nutrient uptake, Ecol. Model., 220, 505–520, doi:10.1016/j.ecolmodel.2008.11.004, 2009.; Sperry, J. S., Stiller, V., and Hacke, U. G.: Xylem hydraulics and the Soil-Plant-Atmosphere Continuum: Opportunities and Unresolved Issues, Agron. J., 95(6), 1362–1370, http://agron.scijournals.org/cgi/content/abstract/95/6/1362, 2003.; Steudle, E.: Water uptake by plant roots: An integration of views, Plant Soil, 226, 45–56, 2000.; Steudle, E. and Peterson, C. A.: How does water get through roots?, J. Exp. Bot., 49(322), 775–788, http://jxb.oxfordjournals.org/cgi/content/abstract/49/322/775, 1998.; Teuling, A. J., Uijlenhoet, R., Hupet, F., and Troch, P. A.: Impact of plant water uptake strategy on soil moisture and evapotranspiration dynamics during drydown, Geophys. Res. Lett., 33, L03401, doi:10.1029/2005GL025019, 2006.; Tuzet, A., Perrier, A., and Leuning, R.: A coupled model of stomatal conductance, photosynthesis and transpiration, Plant Cell Environ., 26, 1097–1116, doi:10.1046/j.1365-3040.2003.01035.x, 2003.; Amenu, G. G. and Kumar, P.: A model for hydraulic redistribution incorporating coupled soil-root moisture transport, Hydrol. Earth Syst. Sci., 12, 55–74, 2008.; Clausnitzer, V. and Hopmans, J. W.: Simultaneous modeling of transient three-dimensional root growth and soil water flow, Plant Soil, 164, 299–314, 1994.; de Jong van Lier, Q., Metselaar, K., and van Dam, J. C.: Root water extraction and limiting soil hydraulic conditions estimated by numerical simulation, Vadose Zone J., 5, 1264–1277, doi:10.2136/vzj2006.0056, 2006.; van Genuchten, M.: A closed-form equation for predicting the hydraulic conductivity of unsaturated soils, Soil Sci. Soc. Am. J., 44, 892–898, 1980.; Vrugt, J. A., van Wijk, M. T., Hopmans, J. W., and {\v S}imunek, J.: One-, two-, and three-dimensional root water uptake functions for transient modeling, Water Resour. Res., 37 (10), 2457–2470, http://www.agu.org/journals/wr/v037/i010/2000WR000027/, 2001.; Wan, C., Yilmaz, I., and Sosebee, R.: Seasonal soil-water availability influences snakeweed root dynamics, J. Arid Environ., 51, 255–264, doi:10.1016/jare.2001.0942, 2002.; Zeng, X., Dai, Y., Dickinson, R., and Shaikh, M.: The role of root distribution for climate simulation over land, Geophys. Res. Lett., 25(24), 4533–4536, http://www.agu.org/pubs/crossref/1998/1998GL900216.shtml, 1998.; Zwieniecki, M. A., Thompson, M. V., and Holbrook, N. M.: Understanding the Hydraulics of Porous Pipes: Tradeoffs Between Water Uptake and Root Length Utilization, J. Plant Growth Regul., 21, 315–323, doi:10.1007/s00344-003-0008-9, 2003.; de Jong van Lier, Q., van Dam, J. C., Metselaar, K., de Jong, R., and Duijnisveld, W. H. M.: Macroscopic Root Water Uptake Distribution Using a Matric Flux Potential Approach, Vadose Zone J., 7, 1065–1078, 2008.; De Willigen, P. and van Noordwijk, M.: Root, Plant. Production and Nutrient Use Efficiency, Ph.D. thesis, Agricultural University, Wageningen, The Netherlands, 1987.; Desborough, C. 

 

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