Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/27434
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Type: Journal article
Title: Effects of soil compaction on phosphorus uptake and growth of Trifolium subterraneum colonized by four species of vesicular-arbuscular mycorrhizal fungi
Author: Nadian, H.
Smith, S.
Alston, A.
Murray, R.
Siebert, B.
Citation: New Phytologist, 1998; 140(1):155-165
Publisher: CAMBRIDGE UNIV PRESS
Issue Date: 1998
ISSN: 0028-646X
1469-8137
Abstract: The ability of four species of vesicular–arbuscular mycorrhizal (VAM) fungi to increase phosphorus uptake and growth of clover plants (Trifolium subterraneum L.) at different levels of soil compaction and P application was studied in a pot experiment. Dry matter in the shoots and roots of clover plants decreased with increasing soil compaction. Colonization by Glomus intraradices Schenck & Smith and Glomus sp. City Beach WUM16 increased plant growth and P uptake up to a bulk density of 1•60 Mg m⁻³, although the response was smaller as soil compaction was increased. Glomus etunicatum Becker & Gerdeman and Glomus mosseae (Nicol. & Gerd.) Gerdemann & Trappe had no effect on the shoot d. wt and P uptake when the bulk density of the soil was ≥1•40 and ≥1•60 Mg m⁻³, respectively. Soil compaction to a bulk density of 1•60 Mg m⁻³ had no effect on the percentage of root length colonized by G. intraradices and Glomus sp. City Beach, but total root length colonized decreased as soil compaction was increased. Decreased P uptake and growth of clover plants colonized by G. intraradices and Glomus sp. City Beach, with increasing soil compaction up to a bulk density of 1•60 Mg m⁻³, was mainly attributed to a significant reduction in total root length colonized and in the hyphal biomass. Soil compaction, which increased bulk density from 1•20 to 1•75 Mg m⁻³, reduced the O₂ content of the soil atmosphere from 0•16 to 0•05 m3 m⁻³. The absence of any observable mycorrhizal growth response to any of the four species of VAM fungi in highly compacted soil (bulk density = 1•75 Mg m⁻³) was attributed to the significant decrease in the O₂ content of the soil atmosphere, change in soil pore size distribution and, presumably, to ethylene production.
Keywords: Soil compaction; P uptake; Trifolium subterraneum L.; VA mycorrhiza
RMID: 0030002625
DOI: 10.1046/j.1469-8137.1998.00219.x
Published version: http://www3.interscience.wiley.com/journal/120702064/abstract
Appears in Collections:Soil and Land Systems publications

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