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Effects of soil air-filled porosity, soil matric potential and soil strength on primary root growth of radiata pine seedlings

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Abstract

The effects of soil air-filled porosity, soil matric potential and soil strength on primary root growth of radiata pine (Pinus radiata D. Don) seedlings were examined in four soil textures ranging from coarse to fine.

At low penetrometer resistance (< 0.5 MPa) and high soil matric potential (≥ − 0.01 MPa), root elongation rate was close to zero when air-filled porosity was < 0.05 m3 m−3, and it increased sharply to 90% of its maximum value at 0.15 m3m−3. This relationship was independent of soil texture. The diameter of the root tip increased as air-filled porosity decreased, particularly below 0.10 m3 m−3.

Root elongation rate decreased linearly with decreasing soil matric potential over the range − 0.01 to −0.35 MPa at both 0.5 MPa and 1.5 MPa soil strength. This relationship was independent of soil texture. The rate of root elongation at 0.5 MPa was about twice that at 1.5 MPa and the rate of decrease in root elongation with decreasing soil matric potential was 1.35 times greater at the lower (0.5 MPa) than the higher (1.5 MPa) soil strength. The effect of water potential (over the range −0.01 to −1.5 MPa) on root elongation at zero soil strength was simulated using PEG 4000 solutions as rooting media. Root elongation declined exponentially over the range of water potentials established in the rooting medium.

Root elongation rate decreased exponentially with increasing soil strength when soil matric potential was constant and air-filled porosity was > 0.20 m3 m−3. This relationship was independent of soil texture. Root elongation rate was half its maximum at a penetrometer resistance of 1.3 MPa. Increasing bulk density has a greater effect of increasing soil strength in coarse soil than in fine soil but decreasing soil water content has a greater effect on increasing soil strength in fine soil than in coarse soil.

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References

  • Baver L D and Farnsworth R B 1940 Soil structure effects in the growth of sugar beets. Soil Sci. Soci. Am. Proc. 5, 45–48.

    Google Scholar 

  • Bengough A G and Mullins C E 1991 Penetrometer resistance, root penetration resistance and root elongation in two sandy loam soils. Plant Soil 13, 56–66.

    Google Scholar 

  • Box J E and Taylor S A 1962 Influence of soil bulk density on matric potential. Soil Sci. Soci. Am. Proc. 26, 119–22.

    Google Scholar 

  • Costantini A, So H B and Doley D 1996 Early Pinus caribaea var. hondurensis root development: I.Influence of matric suction. Aust. J. Exp. Agr. 36, 839–846.

    Google Scholar 

  • Dexter A R 1986 Model experiments on the behaviour of roots at the interface between a tilled seed-bed and a compacted sub-soil. Plant Soil 95, 123–133.

    Google Scholar 

  • Dexter A R 1987 Mechanics of root growth. Plant Soil 98, 303–312.

    Google Scholar 

  • Eavis BW 1972 Soil physical conditions affecting seedling root growth. I.Mechanical impedance, aeration and moisture availability as influenced by bulk density and moisture levels in a sandy loam soil. Plant Soil 36, 612–622.

    Google Scholar 

  • Grable A R and Siemer E G 1968 Effects of bulk density, aggregate size, and water suction on oxygen diffusion, redox potentials, and elongation of corn roots. Soil Sci. Soci. Am. Proc. 32, 180–186.

    Google Scholar 

  • Greacen E L 1986 Root response to soil mechanical properties. Transactions of the 13th International Congress of Soil Science 5, 20–47.

    Google Scholar 

  • Greacen E L and Sands R 1980 Compaction of forest soils: a review. Aust. J. of Soil Res. 18, 163–188.

    Google Scholar 

  • Lawlor D W 1970 Absorption of polyethylene glycols and their effects on plant growth. New Phytol. 69,501–513.

    Google Scholar 

  • Lesham B 1966 Toxic effects of carbowaxes (polyethylene glycols) on Pinus halapensis Mill. Seedlings. Plant Soil 24, 322–324.

    Google Scholar 

  • Mason E G, Cullen A W J and Rijkse W C 1988 Growth of two Pinus radiata stock types on ripped and ripped/bedded plots at Karioi forest. N Z J. of For. Sci. 18, 287–296.

    Google Scholar 

  • McIntyre D S and Loveday L 1974 Particle Size Analysis In Methods for Analysis of Irrigated Soils. Ed. J Loveday. Commonwealth Agricultural Bureaux.

  • Mexal J, Fisher J T, Osteryoung J and Reid C P P 1975 Oxygen availability in polyethylene glycol solutions and its implications in plant water relations. Plant Physiol. 55, 20–24.

    Google Scholar 

  • Misra R K and Gibbons A K 1996 Growth and morphology of eucalypt seedling-root in relation to soil strength arising from compaction. Plant Soil 182, 1–11.

    Google Scholar 

  • Misra R K and Li F D 1996 The effects of radial soil confinement and probe diameter on penetrometer resistance. Soil Till. Res. 38, 59–69.

    Google Scholar 

  • Nelson D W and Sommers L E 1982 Total carbon, organic carbon, and organic matter. In Methods of Soil Analysis. Part 2. Chemical and Microbiological properties. Eds. A L Page, R H Miller and DR Keeney. American Society of Agronomy. Soil Science Society of America.

  • Penfold C L 1999 Influence of soil air-filled porosity on primary root length and growth of radiata pine. Thesis for Masters degree. New Zealand School of Forestry, University of Canterbury, Christchurch.

    Google Scholar 

  • Sands R 1983 Physical changes to sandy soils planted to radiata pine. In Proc. IUFRO Symposium of Site and Continuous Productivity. USDA General Technical Report PNW-163, Seattle, Washington.

  • Sands R and Bowen G D 1978 Compaction of sandy soils in radiata pine forests: II. Effects of compaction on root configuration and growth of radiata pine seedlings. Aust. For. Res. 8, 163–170.

    Google Scholar 

  • Sands R, Greacen E L and Gerard C J 1979 Compaction of sandy soils in radiata pine forests. I. A penetrometer study. Aust. J. Soil Res. 17, 101–113.

    Google Scholar 

  • Sun O J and Payn T W 1999 Magnesium nutrition and photosynthesis in Pinus radiata: Clonal variation and influence of potassium. Tree Physiol. 19, 535–540.

    Google Scholar 

  • Theodorou C, Cameron J N and Bowen G D 1991 Growth of roots of different Pinus radiata genotypes in soil at different strength and aeration. Aust. For. 54, 52–59.

    Google Scholar 

  • Wesseling J and Van Wijk W R 1957 Soil physical conditions in relation to drain depth. In Drainage of agricultural lands. Ed. JN Luthin. pp 461–504. Agronomy.

  • Yapa L G, Fritton D D and Willatt S T 1988 Effects of soil strength on root growth under different water condition. Plant Soil 109, 9–16.

    Google Scholar 

  • Youngman N D 1988 To identify the zones of day and night root elongation in Pinus radiata: A dissertation for the Bachelor of Forestry Science degree. New Zealand School of Forestry, University of Canterbury, Christchurch.

    Google Scholar 

  • Zou C 1999 Soil physical properties and root growth of radiata pine. PhD Thesis. University of Canterbury, Christchurch.

    Google Scholar 

  • Zou C, Sands R, Buchan G and Hudson I 2000 Least limiting water range: A potential indicator of physical quality of forest soils. Aust. J. Soil Res., 38, 947–958.

    Google Scholar 

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Zou, C., Penfold, C., Sands, R. et al. Effects of soil air-filled porosity, soil matric potential and soil strength on primary root growth of radiata pine seedlings. Plant and Soil 236, 105–115 (2001). https://doi.org/10.1023/A:1011994615014

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