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Phytoextraction of phosphorus for ecological restoration: application of soil additives

Stephanie Schelfhout (UGent), Tom Du Pré, An De Schrijver (UGent), Kris Verheyen (UGent), Geert Haesaert (UGent), Sara De Bolle (UGent) and Jan Mertens (UGent)
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Abstract
The European Habitats Directive urges the European member states to take measures for maintaining and restoring natural habitats. In Flanders (Belgium) and the Netherlands, the surface area of nature reserves is intended to be enlarged with 38 000 ha and 150 000 ha, respectively, what is mainly to be realised on former agricultural land. In order to restore species rich nature habitats on former agricultural land, it is crucial to decrease the availability of nutrients and a limitation for plant growth by at least one nutrient should be ensured. The former fertilization of P in the agricultural context results in an immense P pool fixated to the soil and this is one of the main problems hindering the ecological restoration. We focus on an alternative restoration method, the phytoextraction of P, also P-mining. This is the deprivation of soil P with a crop with high P-use efficiency and non-P fertilization. This method allows the gradual transition from agricultural land use towards nature management. Up until now there have only been estimations of the P-mining duration time from the initial phase of the mining-process. In order to estimate the P-extraction over time the experiments take place on a soil-P-chronosequence. A controlled pot experiment was set up with soil from three former agricultural sites with different soil-P-levels, Lolium perenne was sown and chemical and biological compounds were added to enhance the bioavailability of P for plant-uptake. The additives used were two concentrations of humic acids, phosphorus solubilising bacteria and arbuscular mycorrhizal fungi. Largest effects of the soil additions on the biomass production were measured in the lowest soil-P-level. Limitation by P in the Mid and Low P soils was very pronounced. The phytoextraction of P will slow down with soil P level decreasing in time. The effect of the soil additions is discussed.
Keywords
Soil-chronosequence, Ecological restoration, Phytoextraction, Phosphorus bioavailability

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Chicago
Schelfhout, Stephanie, Tom Du Pré, An De Schrijver, Kris Verheyen, Geert Haesaert, Sara De Bolle, and Jan Mertens. 2012. “Phytoextraction of Phosphorus for Ecological Restoration: Application of Soil Additives.” In EcoSummit, 4th International, Posters.
APA
Schelfhout, S., Du Pré, T., De Schrijver, A., Verheyen, K., Haesaert, G., De Bolle, S., & Mertens, J. (2012). Phytoextraction of phosphorus for ecological restoration: application of soil additives. EcoSummit, 4th International, Posters. Presented at the 4th International Ecosummit : Ecological sustainability : restoring the planet’s ecosystem services.
Vancouver
1.
Schelfhout S, Du Pré T, De Schrijver A, Verheyen K, Haesaert G, De Bolle S, et al. Phytoextraction of phosphorus for ecological restoration: application of soil additives. EcoSummit, 4th International, Posters. 2012.
MLA
Schelfhout, Stephanie, Tom Du Pré, An De Schrijver, et al. “Phytoextraction of Phosphorus for Ecological Restoration: Application of Soil Additives.” EcoSummit, 4th International, Posters. 2012. Print.
@inproceedings{3035876,
  abstract     = {The European Habitats Directive urges the European member states to take measures for maintaining and restoring natural habitats. In Flanders (Belgium) and the Netherlands, the surface area of nature reserves is intended to be enlarged with 38 000 ha and 150 000 ha, respectively, what is mainly to be realised on former agricultural land.  In order to restore species rich nature habitats on former agricultural land, it is crucial to decrease the availability of nutrients and a limitation for plant growth by at least one nutrient should be ensured. The former fertilization of P in the agricultural context results in an immense P pool fixated to the soil and this is one of the main problems hindering the ecological restoration. We focus on an alternative restoration method, the phytoextraction of P, also P-mining. This is the deprivation of soil P with a crop with high P-use efficiency and non-P fertilization. This method allows the gradual transition from agricultural land use towards nature management. Up until now there have only been estimations of the P-mining duration time from the initial phase of the mining-process.
In order to estimate the P-extraction over time the experiments take place on a soil-P-chronosequence. A controlled pot experiment was set up with soil from three former agricultural sites with different soil-P-levels,  Lolium perenne  was sown and chemical and biological compounds were added to enhance the bioavailability of P for plant-uptake. The additives used were two concentrations of humic acids, phosphorus solubilising bacteria and arbuscular mycorrhizal fungi. Largest effects of the soil additions on the biomass production were measured in the  lowest soil-P-level. Limitation by P in the Mid and Low P soils was very pronounced. The phytoextraction of P will slow down with soil P level decreasing in time. The effect of the soil additions is discussed.},
  author       = {Schelfhout, Stephanie and Du Pr{\'e}, Tom and De Schrijver, An and Verheyen, Kris and Haesaert, Geert and De Bolle, Sara and Mertens, Jan},
  booktitle    = {EcoSummit, 4th International, Posters},
  keyword      = {Soil-chronosequence,Ecological restoration,Phytoextraction,Phosphorus bioavailability},
  language     = {eng},
  location     = {Columbus, OH, USA},
  title        = {Phytoextraction of phosphorus for ecological restoration: application of soil additives},
  year         = {2012},
}