Abstract
A simulation model “DanStress” was developed for studying the integrated effects of soil, crop and climatic conditions on water relations and water use of field grown cereal crops. The root zone was separated into 0.1 m deep layers of topsoil and subsoil. For each layer the water potential at the root surface was calculated by a single root model, and the uptake of water across the root was calculated by a root contact model. Crop transpiration was calculated by Monteith's combination equation for vapour flow. Crop conductance to water vapour transfer for use in Monteith's combination equation was scaled up from an empirical stomatal conductance model used on sunlit and shaded crop surfaces of different crop layers. In the model, transpirational water loss originates from root water uptake and changes in crop water storage. Crop water capacitance, used for describing the water storage, was derived from the slope of pressure-volume (PV) curves of the leaves. PV curves were also used for deriving crop water potential, osmotic potential, and turgor pressure. The model could simulate detailed diurnal soil-crop water relations during a 23-day-drying cycle with time steps of one hour.
During the grain filling period in spring barley (Hordeum distichum L.), grown in a sandy soil in the field, measured and predicted values of leaf water and osmotic potential, RWC, and leaf stomatal conductance were compared. Good agreement was obtained between measured and predicted values at different soil water deficits and climatic conditions. In the field, measured and predicted volumetric soil water contents (θ) of topsoil and subsoil layers were also compared during a drying cycle. Predicted and measured θ-values as a function of soil water deficits were similar suggesting that the root contact model approach was valid.
From the investigation we concluded: (I) a model, which takes the degree of contact between root surface and soil water into account, can be used in sandy soil for calculation of root water uptake, so that the root conductance during soil water depletion only varies by the degree of contact; (II) crop conductance, used for calculation of crop transpiration, can be scaled up from an empirical single leaf stomatal conductance model controlled by the level of leaf water potential and micrometeorological conditions; (III) PV curves are usable for describing crop water status including crop water storage.
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References
Adams R S, Black T A and Fleming R L 1991 Evapotranspiration and surface conductance in a high elevation, grass-covered forest clear cut. Agric. For. Meteorol. 56, 173–193.
Andersen M N, Jensen C R and Lösch R 1991 Derivation of pressure-volume curves by a non-linear regression procedure and determination of apoplastic water. J. Exp. Bot. 42, 159–165.
Andersen M N, Jensen C R and Lösch R 1992a The interaction effects of potassium application and drought in field-grown barley. I. Yield, water use efficiency and growth. Acta Agric. Scand., Sect. B, Soil and Plant Sci. 42, 34–44.
Andersen M N, Jensen C R and Lösch R 1992b The interaction effects of potassium application and drought in field-grown barley. II. Nutrient relations, tissue water content and morphological development. Acta Agric. Scand., Sect. B, Soil and Plant Sci. 42, 45–56.
Bavel C H Mvan 1967 Changes in canopy resistance to alfalfa induced by water depletion. Agric. Meteorol. 4, 165–176.
Ben-Asher J, Meek D W, Hutmacher R B and Phene C J 1989 Computational approach to assess actual transpiration from aerodynamic and canopy resistance. Agron. J. 81, 776–782.
Biscoe P V, Littleton L J and Scott R K 1973 Stomatal control of gas exchange in barley awns. Ann. Appl. Biol. 75, 285–297.
Campbell G S 1974 A simple method for determining unsaturated conductivity from moisture retention data. Soil Sci. 117, 311–314.
Campbell G S 1977 An Introduction to Environmental Biophysics. Springer-Verlag, New York.
Cowan I R 1965 Transport of water in the soil-plant-atmosphere system. J. Appl. Ecol. 2, 211–239.
Denmead O T and Shaw R H 1962 Availability of soil water to plants as affected by soil moisture content and meteorological conditions. Agron. J. 54, 385–390.
Faiz S M A and Weatherley P E 1978 Further investigations into the location and magnitude of the hydraulic resistances in the soil plant system. New Phytol. 81, 19–28.
Fernandez C J and McCree K J 1991 Simulation model for studying dynamics of water flow and water status in plants. Crop Sci. 31, 391–398.
Fowler D and Unsworth M H 1979 Turbulent transfer of sulphur dioxide to a wheat crop. Quart. J. Royal Meteorol. Soc. 105, 767–783.
Gardner W R 1960 Dynamic aspects of water availability to plants. Soil Sci. 89, 63–73.
Gardner W R 1991 Modeling water uptake by roots. Irrig. Sci. 12, 109–114.
Hanks R J and Nimah M N 1988 Integrating and applying soil and plant water status measurements. Irrig. Sci. 9, 319–328.
Hansen L 1976 Soil types at the Danish State Experimental Stations. Danish J. Plant and Soil Sci. No 1312, 742–758.
Hansen S, Jensen S E and Aslyng H C 1981 Agrometeorological Observations and Statistical Analysis (In Danish). Hydrotechnical Laboratory, The Royal Veterinary and Agricultural University, Copenhagen. 414 p.
Haverkamp P and Vauclin M 1979 A note on estimating finite difference interblock hydraulic conductivity values for transient unsaturated flow problems. Water Resour. Res. 15, 181–187.
Herkelrath W N, Miller E E and Gardner W R 1977 Water uptake by plants. II. The root contact model. Soil Sci. Soc. Am. J. 41, 1039–1044.
Jagtap S S and Jones J W 1989 Evapotranspiration model for developing crops. Transactions of the ASAE, 32, 1342–1350.
Jarvis P G 1976 The interpretation of the variations in leaf water potential and stomatal conductance found in canopies in the field. Phil. Trans. R. Soc. Lond. B 273, 593–610.
Jensen C R, Henson I E and Turner N C 1989 Leaf gas exchange and water relations of lupins and wheat. II. Root and shoot water relations of lupin during drought-induced stomatal closure. Aust. J. Plant Physiol. 16, 415–428.
Jensen C R, Henson I E and Hansen S 1990 A root contact model and potential differences to water flow in the soil plant system. In. Proc. Int. Congr. Plant Physiol. New Delhi, 15–20 February 1988. Eds. S K Sinha, P V Sane, S C Bhargava and P V Agrawal. pp 825–881. Soc. Plant Physiol. Biochem.
Jensen C R, Andersen M N and Lösch R 1992 Leaf water relations characteristics of differently potassium fertilized and watered field grown barley plants. Plant and Soil 140, 225–239.
Jensen H E, Svendsen H, Jensen S E and Mogensen V O 1990a Canopy-air temperature of crops grown under different irrigation regimes in a temperate humid climate. Irrig. Sci. 11, 181–188.
Jensen S E 1979 Model ETFOREST for calculating actual evapotranspiration. In Comparison of Forest Water and Energy Exchange Models. Proc. from an IUFRO Work-shop, Uppsala 1978. Ed. SHalldin. pp 165–172. Int. Soc. for Ecol. Model. (ISEM), Copenhagen.
Katerji N, Hallaire M, Menoux-Boyer Y and Durand B 1986 Modelling diurnal patterns of leaf water potential in field conditions. Ecol. Model. 33, 185–203.
Lösch R, Jensen C R and Andersen M N 1992 Diurnal courses and factorial dependencies of leaf conductance and transpiration of differently potassium fertilized and watered field grown barley plants. Plant and Soil 140, 205–224.
LuchiariJr. A and Riha S J 1991 Bulk surface resistance and its effects on evapotranspiration rates in irrigated wheat. Agron. J. 83, 888–895.
Molz F J 1981 Models of water transport in the soil-plant system: A Review. Water Resour. Res. 17, 1245–1260.
Monteith J L 1964 Evaporation and environment. In The State and Movement of Water in Living Organisms. pp 205–234. 19th Symp. Soc. Exp. Biol.
Monteith J L and Unsworth M H 1990 Principles of Environmental Physics. Edward Arnold, London. 291 p.
Moreshet S, Huck M G, Hesketh J D and Peters D B 1990 Relationships between sap flow and hydraulic conductivity in soybean plants. Agronomie 10, 381–389.
Nielsen J D and Møberg J P 1985 Classification of soil profiles at Danish research stations. Danish J. Plant and Soil Sci. No 1776, 157–167.
Penman H L 1956 Evaporation: An introductory survey. Neth. J. Agric. Sci. 4, 8–29.
Raats P A C and Gardner W R 1971 Comparison of empirical relationships between pressure head and hydraulic conductivity and some observations on radially symmetric flow. Water Resour. Res. 7, 921–928.
Rochette P, Pattey E, Desjardins R L, Dwyer L M, Stewart D W and Dubé P A 1991 Estimation of maize (Zea mays L.) canopy conductance by scaling up leaf stomatal conductance. Agric. For. Meteorol. 54, 241–261.
Ross J 1975 Radiative transfer in plant communities. In Vegetation and the Atmosphere. Volume 1, Principles. Ed. J LMonteith. pp 13–55. Academic Press, London.
Seaton K A, Landsberg J J and Sedgeley R H 1977 Transpiration and leaf water potentials of wheat in relation to changing soil water potential. Aust. J. Agric. Res. 28, 355–367.
Shaykewich C F and Stroosnijder L 1977 The concept of matric flux potential applied to simulation of evaporation from soil. Neth. J. Agric. Sci. 25, 63–82.
Stewart D W, Dwyer L M and Desjardins R L 1985 A mathematical model of transpiration using non-linear least squares analysis. Can. Agric. Eng. 27, 1–6.
Thorne G N 1965 Photosynthesis of ears and flag leaves of wheat and barley. Ann. Bot. 29, 317–329.
Veen B W, Noordwijk Mvan, Willigen Pde, Boone F R and Kooistra M J 1992. Root-soil contact of maize, as measured by a thin-section technique. III. Effects on shoot growth, nitrate and water uptake efficiency. Plant and Soil 139, 131–138.
Zur B and Jones J W 1981 A model for the water relations, photosynthesis and expansive growth of crops. Water Resour. Res. 17, 311–320.
Zur B, Jones J W, Boote K J and Hammond L C 1982 Total resistance to water flow in field soybeans. II. Limiting soil moisture. Agron. J. 74, 99–105.
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Jensen, C.R., Svendsen, H., Andersen, M.N. et al. Use of the root contact concept, an empirical leaf conductance model and pressure-volume curves in simulating crop water relations. Plant Soil 149, 1–26 (1993). https://doi.org/10.1007/BF00010759
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DOI: https://doi.org/10.1007/BF00010759