Soil compaction around Eucalyptus grandis roots: a micromorphological study
E. P. Clemente A B , C. E. G. R. Schaefer A , R. F. Novais A , J. H. Viana A and N. F. Barros AA Departamento de Solos, Universidade Federal de Viçosa, Viçosa, MG, Brasil.
B Corresponding author. Email: eliane_depaula@yahoo.com.br
Australian Journal of Soil Research 43(2) 139-146 https://doi.org/10.1071/SR04069
Submitted: 27 May 2004 Accepted: 12 November 2004 Published: 1 April 2005
Abstract
This study aimed to evaluate the effects of Eucalyptus grandis root growth on localised soil compaction and fracturing. Undisturbed soil (Kandiustox) samples subjected to root growth pressure were used, employing 2 methods to study the phenomenon: (i) micromorphological analysis of thin sections of soil samples compacted by roots of 0.3, 0.9, 1.3, 2.8, 3.5, 6.4, 8.0, 9.0, and 10.2 cm diameter, carried out in the zone under direct root influence, up to 1 cm from the root–soil surface, compared with a reference area at a distance of 3 cm from the contact surface; (ii) a localised infiltration test to assess the time taken to infiltrate one drop of water into the surface of root-compacted soils, compared with the time taken in a reference sample without root compaction. The soil compaction was greater around root diameters >3.5 cm, and this effect was accompanied by reduced water infiltration in the soil surface at the root contact. Presence of chiseling fractures at an approximate 45° angle to the soil surface suggested helicoidal growth of the E. grandis root, causing both soil compression and shearing. At microscopic level the soil-root contact showed clay-oriented features, microfractures, fungi coatings, and micro-slickensides. The lower infiltration rate in the compacted soil–root surface is associated with both physical (compaction) and chemical (possibly hydrophobicity) mechanisms. The use of micromorphological techniques and image analysis allowed the observation and quantification of soil porosity in the vicinity of roots.
Additional keywords: tree roots, rhizosphere, chiseling fractures, slickensides.
Bennie ATP, Burger R duT
(1988) Penetration resistence of fine sandy soils as affected by relative bulk density, water content and texture. South African Journal of Plant and Soil 5, 5–10.
Brown JL
(1977) Estude de la perturbation de horizons du sol par un arbre qui se renverse et de son impact sur la pédogenese. Canadian Journal of Soil Science 57, 173–186.
Brown HJ,
Cruse RM, Erbach DC
(1992) Tractive device effects on soil physical properties. Soil and Tillage Research 22, 41–53.
| Crossref | GoogleScholarGoogle Scholar |
Borges EN,
Lombardi Neto F,
Corrêa GF, Costa LM
(1997) Misturas de gesso e matéria orgânica alterando atributos físicos de um latossolo com compactação simulada. Revista Brasileira de Ciência do Solo 21, 125–130.
Camargo, OA (1983).
Costa, JB (1985).
Dexter AR
(1987) Compression of soil around roots. Plant and Soil 97, 401–406.
Fahn, A (1995).
Faria JC,
Schaefer CEGR,
Ruiz HA, Costa LM
(1998) Effects of weed control on physical and micropedological properties of a Brasilian Ultisol. Revista Brasileira de Ciência do Solo 22, 731–741.
Fernandes RBA
(1996) Influência das características químicas, físicas e mineralógicas na compactação de três latossolos. MSc thesis, Universidade Federal de Viçosa.
Foster RC
(1981) Ultrastructure and histochemistry of the rhizosphere. New Phytologist 89, 263–273.
Greacen EL, Sands R
(1980) Compaction of forest soils—A review. Australian Journal of Soil Research 18, 163–189.
Langmaack M,
Schrader S,
Rapp-Bernhardt U, Kotzke K
(1999) Quantitative analysis of earthworm burrow systems with respect to biological soil structure regeneration after soil compaction. Biology and Fertility of Soils 28, 219–229.
| Crossref | GoogleScholarGoogle Scholar |
Lima DCL, Nieto AS, Viotti CB, Bueno BS
(1992) Applicability of classical soil mechanics: Principles to structural soil. ‘Proceedings US/Brazil Geotechnical Workshop’. Belo Horizonte, Minas Gerais-Brazil..
Lipiec J, Hatanob R
(2003) Quantification of compaction effects on soil physical properties and crop growth. Geoderma 116, 107–136.
| Crossref | GoogleScholarGoogle Scholar |
Moran CJ
(1994) Image processing and soil micromorphology. ‘Soil micromorphology: Studies in manegement and genesis’. Developments in Soil Science 22.,(Eds A Ringrose-Voase, GS Humphreys)
pp. 459–482. (Elsevier: Amsterdam)
Nadian H,
Smith SE,
Alston AM, Murray RS
(1996) The effect of soil compaction on growth and P uptake by Trifolium subterraneum: interactions with mycorrhizal colonization. Plant and Soil 182, 39–49.
| Crossref | GoogleScholarGoogle Scholar |
Raven, PH ,
Evert, RF ,
and
Curtis, H (1978).
Resende, M ,
Curi, N ,
and
Rezende, SB (1995).
Ryan PJ, McGarity JW
(1983) The nature and spatial variability of soil properties adjacent to large forest eucalypts. Soil Science Society of America Journal. 47, 286–293.
Schaefer CEGR,
Souza CM,
Vallejos MFJ,
Viana JHM,
Galvão JCC, Ribeiro LM
(2001) Características da porosidade de um Argissolo Vermelho-Amarelo submetido a diferentes sistemas de preparo de solo. Revista Brasileira de Ciência do Solo 25, 775–779.
Taylor HM
(1974) Root behavior as affected by soil structure and strength. ‘The plant root and its environment’. (Ed. EW Carson)
pp. 271–291. (University Press of Virginia: Charlottesville, VA)
Viana JH, Fernandes Filho EI
(2001) Quantiporo: um novo programa para tratamento e quantificação de imagens digitais para aplicação em ciência do solo. ‘XXVIII Congresso Brasileiro de Ciencia do Solo’. Londrina-PR, programa e resumos, p. 224.
Wallis MG, Horne DJ
(1992) Soil water repellency. Advances in Soil Sciences 20, 98–146.
Young IM
(1998) Biophysical interactions at the root-soil interface: A review. Journal of Agricultural Science 130, 1–7.
| Crossref | GoogleScholarGoogle Scholar |
