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Chemical amelioration of high phosphorus availability in soil to aid the restoration of species-rich grassland

Gilbert, Joanne C.; Gowing, David J.G. and Loveland, Peter (2003). Chemical amelioration of high phosphorus availability in soil to aid the restoration of species-rich grassland. Ecological Engineering, 19(5) pp. 297–304.

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Whilst removal of phosphorus (P) by vegetation harvest can take decades to reduce plant-available soil P significantly, chemical amelioration offers a possible method of reducing P availability more rapidly by immobilizing P in a form unavailable for plant uptake. A replicated block experiment was established on two field sites using treatments of aluminium sulphate, elemental sulphur (S) and calcium carbonate to investigate the possibility of reducing P availability. Five plant species typical of wet grasslands were transplanted into the treated soil to investigate the effect of the treatments on species diversity. The results show that P availability in 0.15 m topsoil was significantly reduced by aluminium sulphate initially by 47% at site 1 and by 33% at site 2, with the effect persisting for the 15-month experimental period. P availability was increased at site 2 by the high dose elemental S treatment by 11%. Site 1 showed a similar trend in the S treatment but the trend was not significant. P availability was not affected by the calcium carbonate treatment. Botanical diversity was not increased by any of the treatments and was initially decreased by the aluminium sulphate treatment at both sites. This could have been due to the associated reduction in pH, which favored the dominant species, Holcus lanatus.

Item Type: Journal Article
ISSN: 0925-8574
Keywords: Chemical amelioration; Available phosphorus; Species-rich grassland; Habitat restoration
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: OpenSpace Research Centre (OSRC)
Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 4311
Depositing User: David Gowing
Date Deposited: 05 Jul 2006
Last Modified: 14 Jan 2016 16:00
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