Dynamics of Water in the Soil-Plant-Atmosphere System: A Model Named Troika
Water tends to move from the surrounding soil to root surfaces, through the plant and thence into the atmosphere along a gradient of water potential. The several rates are generally transient, and thus attempts to look at the processes from a viewpoint smaller than that of a system are futile. Water uptake rates depend on soil state and parametric variables, such as water potential and conductivity, and on similar plant characteristics. The latter in turn depend on activities throughout the plant previous to the time of rate calculations, including the history of transpiration and water uptake. Rates of movement within and from the plant depend on the environment as well as the physiological conditions of the plant.
KeywordsPermeability Dioxide Hydration Depression Dehydration
Unable to display preview. Download preview PDF.
- Cowan, I. R., Milthorpe, F. L.: Plant factors influencing the water status of plant tissues. In: Water Deficits and Plant Growth. Ed.: T. T. Kozlowski. New York: Academic Press 1968, Ch. 6.Google Scholar
- Hanks, R. J., Bowers, S. A.: Numerical solution of the moisture flow equations for infiltration into layered soils. Soil Sc. Soc. Amer. Proc. 26, 30–534 (1962).Google Scholar
- Hopmans, P. A. M.: Types of stomatal cycling and their water relations in bean leaves. Pflanzenphysiol. 60 (3), 242–254 (1969).Google Scholar
- IBM: System/360 Continuous System Modeling Program (360A-CX-16X) Users Manual 1968.Google Scholar
- Keulen, H. van, Beek, C. G. E. M. van: Water transport in layered soils. Neth.J. Agr. Sci. 19, 138–153 (1971).Google Scholar
- Klute, A., Peters, D. B.: Water uptake and root growth. In: Root Growth, pp. 105–133. Ed.: W. J. Whittington. London: Butterworths 1969.Google Scholar
- Lambert, J. R., Penning de Vries, F. W. T.: The model Troika: listing. Clemson, South Carolina: Clemson University, Agr. Engr. Res. Rep. No. 16, (1971).Google Scholar
- Philip, J. R.: The physical principles of soil water movement during the irrigation cycle. Trans. 3rd Congr. Intern. Comm. Irrig. Drainage, 8, 125 (1957).Google Scholar
- Shih, Sun-Fu: A mathematical solution for transient radial flow in unsaturated soil. Unpublished Ph. D. Thesis. Raleigh: N. C. State University 1969.Google Scholar
- Slatyer, R. O.: Plant-water relationships. New York: Academic Press 1967.Google Scholar