Abstract
The poor growth of young Eucalyptus regnans seedlings in undried soil from the mature forest of E. regnans can be overcome by previously air-drying the soil or by adding sufficient amounts of complete soluble fertilizer or equivalent concentrations of P (as NaH2PO4) and N (as NaNO3). A factorial pot experiment in which phosphate and nitrate were added to undried soil indicated that P was the primary deficiency for young seedlings and that response to N did not occur until this lack was satisfied. In dried soil, seedlings also responded to additions of complete fertilizer but most of this effect was due to N rather than P. Field trials in the mature forest also indicated greater growth in dried soil than undried soil and confirmed a response of young seedlings to superphosphate. In pot experiments, the concentration of P and N per g plant dry weight after four months was relatively constant irrespective of the final size of the plant. Seedlings in dried soil extracted up to 15 times more P than did those grown in undried soil. In general, chemical analysis of soil indicated more extractable P and N from dried soil although this was not always consistently so. Soil desiccation resulted in an increase in soil surface area due to the fragmentation of larger peds and to an increase in the number of microfractures which remained in the soil crumbs after rewetting. Mycorrhiza are likely to be important since the differentiation of the growth response of seedlings in dried and undried soil, which occurred at 5–6 weeks, corresponded with the establishment of full ectomycorrhizal development (80% root tips). The factors concerned with the increase in fertility after air-drying are discussed.
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Abbreviations
- GR:
-
Growth Ratio
References
Ashton D H 1976 Studies on the Mycorrhizae of Eucalyptus regnans F Muell. Aust. J. Bot. 24, 723–741.
Ashton D H and Attiwill P M 1994 Tall open forests. In Australian Vegetation. Ed. R HGroves. 2nd ed. University Press, Melbourne, Australia.
Ashton D H and Kelliher K J 1995 The effects of forest soil desiccation on the growth of Eucalyptus regnans seedlings. Veg. Sci. (In press).
Ashton D H and Willis E R 1982 Antagonisms in the regeneration of Eucalyptus regnans in the mature forest. In The Plant Community as a Working Mechanism. Ed. E INewman. pp 113–128. Blackwell Publishers, Oxford, UK.
Attiwill P M 1980 Nutrient cycling in a Eucalyptus obliqua L'Herit forest. IV. Nutrient uptake and nutrient return. Aust. J. Bot. 28, 199–222.
Attiwill P M 1981 Energy, nutrient flow and biomass. In Productivity in Perpetuity. Proceedings of the Australian Forest Nutrient Workshop, CSIRO, Melbourne. pp 131–144.
Baver L D 1948 Soil Physics, 2nd edition. John Wiley and Sons, Inc. NY.
Birch H F 1958 The effect of soil drying on humus decomposition and nitrogen availability. Plant and Soil 10, 9–31.
Birch H F 1959 Further observations on humus decomposition and nitrification. Plant and Soil 11, 262–286.
Chambers D P and Attiwill P M 1994 The ash-bed effect in Eucalyptus regnans forest: chemical, physical and microbiological changes in soil after heating and partial sterilization. Aust. J. Bot. 42, 739–749.
Florence R G and Crocker R L 1962 Analysis of blackbutt (Eucalyptus pilularis Sm.) seedling growth in a blackbutt forest soil. Ecology 43, 670–679.
Gardner R 1937 A method of measuring the capillary tension of soil moisture over a wide range. Soil Sci. 43, 277–293.
Humphreys F R and Lambert M J 1965 An examination of a forest site which has exhibited the ash-bed effect. Aust. J. Soil Res. 3, 81–94.
Jager G and Bruits E H 1975 Effect of repeated drying at different temperatures on soil organic matter decomposition and characteristics of the microflora. Soil Biol. Biochem. 7, 153–159.
Kieft T L, Soroker E and Firestone M 1987 Microbial biomass response to a rapid increase in water potential when dry soil is rewetted. Soil Biol. Biochem. 19, 119–126.
Lahav N, Brusse A, Sapir J and Gill S 1968 The influence of prewetting and wetting-drying cycles on the soil solution. Isr. Agric. Res. 18, 51–61.
Loneragan O W and Loneragan J F 1964 Ashbed and nutrients in the growth of Karri seedlings. J. Roy. Soc. West Aust. 47, 74–80.
Moran C J, McBratney A B and Koppi A J 1988 Rapid measurement of the macropore structure of an artificially compacted clay soil. In Effects of Management Practices on Soil Physical Properties. Proceedings of the National Workshop, Toowoomba, Queensland, 7–10 Sept 1987. Eds. K JCoughlan and P NTruog. pp 131–134. Queensland Department of Primary Industries, Australia.
Mullette K J, Hannon N J and Elliott A G L 1974 Insoluble phosphorus usage by Eucalyptus. Plant and Soil 41, 194–205.
Olsen R G and Court M N 1982 Effect of drying soil on phosphate absorption and resin extraction of soil phosphate. J. Soil Sci. 33, 709–717.
Page A L, Keeney D R and Miller R H 1972 Methods of Soil Analysis, Part 2 — Chemical and Microbiological Properties, 2nd ed. Am. Soc. Agron. Soil Sci. Am. Madison, WI, USA.
Polglase P J, Attiwill P M and Adams M A 1986 Immobilization of soil nitrogen following wildfire in two eucalypti forests of southeastern Australia. Oecol. Plant. 7, 261–272.
Pryor L D 1963 Ashbed growth response as a key to plantation establishment on poor sites. Aust. For. 27, 48–51.
Renbuss M A, Chilvers G A and Fryor L D 1973 Microbiology of an ashbed. Proc. Linn. Soc. N.S.W. 97, 302–310.
Russell E W 1973 Soil Conditions and Plant Growth Tenth edition. Longman, London.
Stewart H T L, Hopmans P, Flinn D W and Croatto G 1990 Harvesting effects on phosphorus availability in a mixed eucalypti ecosystem in southeast Australia. For. Ecol. Manage. 36, 149–162.
Technicon 1977a Individual simultaneous determination of nitrogen and/or phosphorus in B D acid digests. Industrial Method No. 329–74 W/B. Technicon Industrial Systems, Tarrytown, NY, USA.
Technicon 1977b Nitrate and nitrite in water and seawater. Industrial Method No. 158–71 W/A. Technicon Industrial Systems, Tanytown, NY, USA.
Warcup J H 1983 The effect of fire and sun-baking on the soil microflora and seedling growth in forest soils. In Soils an Australian viewpoint. Division of Soils CSIRO pp 735–740. CSIRO, Melbourne Australia Academic Press, London, UK.
Woodruff J R and Kamprath E J 1965 Phosphorus adsorption maximum as measured by isotherm and its relationship to phosphorus availability. Proc. Soil Sci. Am. 29, 148–150.
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Ashton, D.H., Kelliher, K.J. The effect of soil desiccation on the nutrient status of Eucalyptus regnans F. Muell seedlings. Plant Soil 179, 45–56 (1996). https://doi.org/10.1007/BF00011641
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DOI: https://doi.org/10.1007/BF00011641