Abstract
Rising water tables and associated soil salinisation are an increasing agricultural and environmental threat in Australia. Water tables will continue to rise over the coming decades (and in some cases centuries) because of the practical limits to reducing recharge in affected catchments, and the time lag between recharge and discharge in the landscape. Thus, land management techniques must be identified to minimise the detrimental impacts of this process. It has generally been assumed that plants overlying shallow water tables take up and transpire more groundwater than would have been evaporated if soils were bare. However, a collation of results from 20 field studies shows that trees, shrubs and crops rarely transpire more than 500 mm yr -1 of saline (electrical conductivity > 5 dS m-1) groundwater. These rates were generally similar to potential groundwater evaporation rates from bare soils with water tables between 1 and 2 m depth. To experimentally verify this conclusion, evaporation from shallow groundwaters under three different land uses (trees, pastures and bare soil) were compared over 18 months at three sites in southeast Queensland. Evaporation of groundwater from trees equalled that from bare soil at one site, but was three times greater than evaporation from bare soil at the other two sites. Groundwater evaporation rates were lowest from pastures at all sites, and were negative (indicating net recharge of the water table) at one of the sites. Transpiration of groundwater continually increases root zone salinity which, in turn, limits water uptake. This process can be modelled to show the interacting effects of water table depth and salinity, plant salt tolerance and soil hydraulic properties on groundwater evaporation. Results of model simulations and the field studies indicate that evaporation of groundwater is most likely to be higher under vegetation than bare soils where water tables are relatively deep and of low salinity, roots can penetrate to the water table, and soils are of low permeability. In other situations, salinisation of the root zone soil limits groundwater evaporation rates from plants, so that rates are no greater than those from bare soils.
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References
Elrick D.E., Mermoud A. and Monnier T. An analysis of solute accumulation during steady-state evaporation in an initially contaminated soil. Journal of Hydrology 1994;155: 27–38.
Fraser, G.W., Thorburn, P.J. and Cramer, V. Comparison of diffuse groundwater discharge from trees and bare soil in south-east Queensland: Preliminary results. In: Proceedings of the Murray-Darling 95 Workshop, Wagga Wagga, Sept 1995 (MDBC, Canberra), 1995; 100–103.
Fraser, G.W., Thorburn, P.J. and Taylor, D.W. Growth and water use of trees in saline land in south east Queensland. In: Proceedings of the 4th National Conference on the Productive Use and Rehabilitation of Saline Lands, Albany, WA, March 1996 (PROMACO Conventions Pty Ltd: Perth), 1996; 219–224.
Gardner W.R. Some steady-state solutions of the unsaturated moisture flow equation with application to evaporation from a water table. Soil Science 1958;58: 228–232.
Gardner W.R. Modeling water uptake by roots. Irrigation Science 1991;12: 109–114.
George, R.J. Reclaiming sandplain seeps by intercepting perched groundwater with eucalypts. Land Degradation and Rehabilitation, 1990;2: 13–25.
George, R.J. Management of sandplain seeps in the wheatbelt of Western Australia. Agricultural Water Management, 1991;19: 85–104.
Greenwood, E.A.N. Water use by trees and shrubs for lowering saline groundwater. Reclamation and Revegetation Research, 1986;5: 423–434.
Greenwood, E.A.N., Klein, L., Beresford, J.D. and Watson, G.D. Differences in annual evaporation between grazed pasture and Eucalyptus species in plantations on a saline farm catchment. Journal of Hydrology, 1985; 78: 261–278.
Huperman, A.F. Salt and water dynamics beneath a tree plantation growing on a shallow watertable (Department of Agriculture, Energy and Minerals, Victoria: Tatura), 1995.
Hutmacher R.B., Ayars J.E., Vail S.S., Bravo A.D., Dettinger D. and Schoneman R.A. Uptake of shallow groundwater by cotton: growth stage, groundwater salinity effects in column lysimeters. Agricultural Water Management 1996;31: 205–223.
Jolly, I.D, Walker, G.R. and Thorbum, P.J. Salt accumulation in semi-arid floodplain soils with implications for forest health. Journal of Hydrology, 1993;150: 589–614.
King, C.A., Schwamberger, E.C., Wallace, M., Smith, D.J., Meyer, W.S. and Thorbum, P.J. Water use, plant development, and capillary upflow from saline water tables in four soils for irrigated maize. CSIRO Division of Water Resources, Technical Memo. 95/8 (CSIRO Division of Water Resources: Canberra), 1995.
Kinsman D.J.J. Evaporites: Relative humidity control of primary mineral facies. Journal of Sedimentary Petrology, 1976;46: 273–279.
Kruse E.D., Champion D.F., Cuevas D.L., Yoder R.E. and Young D. Crop water use from shallow, saline water tables. Transactions of the American Society of Agricultural Engineers 1993;36: 697–707.
Mensforth, L.J. Water use strategy of Melaleuca halmaturorum in a saline swamp. Ph.D. Thesis, University of Adelaide, Adelaide, South Australia, 1996.
Mensforth, L.J. and Walker, G.R. Water use ofMelaleuca halmaturorum in a saline swamp. In: Proceedings of the 4th National Conference on the Productive Use and Rehabilitation of Saline Lands, Albany, WA, March 1996 (PROMACO Conventions Pty Ltd: Perth), 1996; 279–285.
Mensforth, L.J., Thorbum, P.J., Tyerman, S.D. and Walker, G.R. Source of water used by riparian Eucalyptus camaldulensis overlying highly saline groundwater. Oecologia, 1994;100: 21–28.
Meyer, W.S., Prathapar, S.A. and Barrs, H.D. Water flux to and from shallow water tables on two irrigated soils. In: Humphreys, E., Muirhead, W.A. and Van der Lelij, A. Eds., Management of Soil Salinity in South East Australia. Proceedings of a symposium, Albury, NSW, Sept, 1989 (Aust. Soil Sci. Soc. Inc., Riverina Branch: Griffith), 1990; 79–87.
Morris, J.D. and Thompson, L.A.J. The role of trees in dryland salinity control. Proceedings of the Royal Society of Victoria, 1983;95: 123–131.
Passioura J.B. Water transport in and to roots. Annual Review of Plant Physiology, Plant Molecular Biology 1988; 39: 245–265.
Passioura, J.B., Ball, M.C. and Knight, J.H. Mangroves may salinize the soil and in so doing limit their transpiration rate. Functional Ecology, 1992;6: 476–481.
Prathapar S.A. and Meyer W.S. Measurement and estimation of capillary upflow from watertables under maize on irrigated soils. Australian Journal of Soil Research 1992;31: 119–130.
Prathapar, S.A., Robbins, C.W., Meyer, W.S. and Jayawardane, N.S. Models for estimating capillary rise in a heavy clay soil with a saline shallow water table. Irrigation Science, 1992;13: 1–7.
Robertson G.A. Saline land in Australia - its extent and predicted trends. Australian Journal of Soil and Water Conservation 1996;9: 4–7.
Shalhevet J. Plants under salt and water stress. In: Fowden, L., Mansfield, T.A. and Stoddart, J.L. (Eds.), Plant adaption to environmental stress, Chapman and Hall, London, 1993; pp. 133–154.
Slavich, P.G., Smith, K.S., Tyennan, S.D. and Walker G.R. Water use ofAtriplex nummularila above saline water tables. In: Proceedings of the 4th National Conference on the Productive Use and Rehabilitation of Saline Lands, Albany, WA, March 1996 (PROMACO Conventions Pty Ltd: Perth), 1996; 255–261.
Smith, D.J., Meyer, W.S., Barrs, H.D. and Schwamberger, E.C. Effects of soil type and groundwater salinity on lucerne crop daily water uptake and capillary upflow in weighing lysimeters from 1990 to 1993. CSIRO Division of Water Resources, Technical Memo. (CSIRO Division of Water Resources: Canberra), 1995.
Talsma, T. The control of saline groundwater. Meded. Landbouwhogeschool Wageningen, 1963;63: 1–68.
Thorburn, P.J. and Meyer, W.S. Response of simulated upflow from shallow water tables to variations in model parameter values. In: Taniguchi M. (Editor), Subsurface Hydrological Responses to Land Cover and Land Use Changes (Kluwer Academic Publishers), 1997 (this volume).
Thorburn, P.J., Hatton, T.J. and Walker, G.R. Combining measurements of transpiration and stable isotopes of water to determine groundwater discharge from forests. Journal ofHydrology, 1993;150: 563–587.
Thorbum, P.J., McEwan, K.L., Smith, D.J., Schwamberger, E.C. and Meyer, W.S. Uptake of saline groundwater by irrigated lucerne. In: Productive Use of Saline Lands - Saline Irrigation Areas. Proceedings of the 3rd Workshop of the NPPUSL, Echuca, Vic, Mar 1994 (NPPUSL), 1994; 107–112.
Thorburn, P.J., Walker, G.R. and Jolly, I.D. Uptake of saline groundwater by plants: An analytical model for semi-arid and arid areas. Plant and Soil, 1995;175: 1–11.
Thorburn, P.J., Walker, G.R. and Woods, P.H. Comparison of diffuse discharge from shallow water tables in soils and salt pans. Journal ofHydrology, 1992;136: 253–274.
van Hylckama, T.E.A. Water use by saltcedar as measured by the water budget method. USGS Professional Paper 491-E (US Govt. Printing Office: Washington), 1974.
Warrick A.W. Additional solutions for steady-state evaporation from a shallow water table. Soil Science 1988;146: 63–66.
Williamson, D.R. The hydrology of salt affected soils in Australia. Reclamation and Revegetation Research, 1986;5: 181–196.
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Thorburn, P.J. (1997). Land Management Impacts on Evaporation from Shallow, Saline Water Tables. In: Subsurface Hydrological Responses to Land Cover and Land Use Changes. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-6141-5_2
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DOI: https://doi.org/10.1007/978-1-4615-6141-5_2
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