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Title: Disentangling the impact of AM fungi versus roots on soil structure and water transport
Contributor(s): Hallett, Paul (author); Feeney, Debbie (author); Bengough, A Glyn (author); Rillig, Matthias (author); Scrimgeour, Charlie M (author); Young, Iain  (author)
Publication Date: 2009
DOI: 10.1007/s11104-008-9717-y
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Abstract: The relative importance of roots and AM-fungi on soil physical processes was investigated by controlling the presence of roots and AM fungi in pot experiments using a mycorrhiza-defective tomato mutant and a wild-type tomato ('Solanum lycopersizum' L.). Root-Zone and Bulk Soil sections were established by splitting pots into two lengthwise halves using a nylon mesh that contained roots while allowing the free movement of fungal hyphae. Post-incubation microbial populations and fungal biomass were measured and related to soil stability, pore structure and water repellency. Unplanted controls consistently had the least fungal biomass, fatty acids, water-stable aggregates (WSA) and water repellency. Wild-type-planted treatments had significantly more WSA than mycorrhiza-defective treatments (P<0.01). Fluctuations in water content induced by transpiration caused significant changes in soil pore structure, measured using high-resolution X-Ray computer tomography. Porosity and mean pore size increased in soil aggregates from planted treatments, which had larger more heterogeneous pores than those in the unplanted soils. AM fungi accentuated soil stability. However, changes were not linked to repellency and fungal biomass. The presence of plants, regardless of AM fungi, appears to have the greatest impact on increasing soil stability.
Publication Type: Journal Article
Source of Publication: Plant Soil, 314(1-2), p. 183-196
Publisher: Springer Science & Business Media BV
Place of Publication: The Netherlands
ISSN: 1573-5036
Field of Research (FOR): 050399 Soil Sciences not elsewhere classified
050305 Soil Physics
060208 Terrestrial Ecology
050303 Soil Biology
Socio-Economic Outcome Codes: 961402 Farmland, Arable Cropland and Permanent Cropland Soils
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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