Influence of Arbuscular Mycorrhizal (AM) Symbiosis on Phosphorus Leaching through Soil Cores |
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Authors: | H R Asghari D J Chittleborough F A Smith S E Smith |
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Institution: | (1) Soil and Land Systems, School of Earth and Environmental Sciences, Waite Campus, The University of Adelaide, DP 636, SA, 5005, Australia;(2) Present address: Shahrood University of Technology, 3619995161-316 Shahrood, Iran |
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Abstract: | Two experiments with soil cores were carried out to investigate the effects of arbuscular mycorrhizal (AM) fungal colonization
on mobility of phosphorus (P) during leaching of repacked columns of a soil with a loamy sand texture. Trifolium subterraneum plants inoculated with an AM fungus or not inoculated were grown in cores with low or high P concentrations for 8 or 10 weeks
in the glasshouse. Cores were then irrigated with 2500 mL water and the leachate collected. Plant growth and the amounts of
P removed by plants, remaining in soil as available P and removed dissolved in leachate were measured. Mycorrhizal fungal
colonization and development of external hyphae were also determined. Inoculation and/or P application significantly increased
plant growth and plant P removal and decreased P leaching. In low P soils AM fungal colonization significantly increased plant
P uptake and decreased soil available P and total dissolved P in leachates. Lower P leaching from cores with AM plants under
low P conditions was related to enhancement of plant growth and to scavenging and removal of P from the soil by roots and/or
external hyphae. When P was applied AM effects were not observed and available P remaining in the soil after leaching was
much higher, regardless of AM fungal colonization. |
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Keywords: | arbuscular mycorrhiza leaching phosphorus Trifolium subterraneum |
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