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000890527 1001_ $$0P:(DE-HGF)0$$aKonrad, Alexander$$b0$$eCorresponding author
000890527 245__ $$aForest Soil Colloids Enhance Delivery of Phosphorus Into a Diffusive Gradient in Thin Films (DGT) Sink
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000890527 520__ $$aPhosphorus (P) is preferentially bound to colloids in soil. On the one hand, colloids may facilitate soil P leaching leading to a decrease of plant available P, but on the other hand they can carry P to plant roots, thus supporting the P uptake of plants. We tested the magnitude and the kinetics of P delivery by colloids into a P sink mimicking plant roots using the Diffusive Gradients in Thin-Films (DGT) technique. Colloids were extracted with water from three forest soils differing in parent material using a method based on dispersion and sedimentation. Freeze-dried colloids, the respective bulk soil, and the colloid-free extraction residue were sterilized and mixed with quartz sand and silt to an equal P basis. The mixtures were wetted and the diffusive fluxes of P into the DGTs were measured under sterile, water unsaturated conditions. The colloids extracted from a P-poor sandy podzolic soil were highly enriched in iron and organic matter compared to the bulk soil and delivered more P at a higher rate into the sink compared to bulk soil and the colloid-free soil extraction residue. However, colloidal P delivery into the sink was smaller than P release and transport from the bulk soil developed on dolomite rock, and with no difference for a soil with intermediate phosphorus-stocks developed from gneiss. Our results provide evidence that both the mobility of colloids and their P binding strength control their contribution to the plant available P-pool of soils. Overall, our findings highlight the relevance of colloids for P delivery to plant roots.
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000890527 7001_ $$0P:(DE-HGF)0$$aBilliy, Benjamin$$b1
000890527 7001_ $$0P:(DE-HGF)0$$aRegenbogen, Philipp$$b2
000890527 7001_ $$0P:(DE-Juel1)145865$$aBol, Roland$$b3
000890527 7001_ $$0P:(DE-HGF)0$$aLang, Friederike$$b4
000890527 7001_ $$0P:(DE-Juel1)129484$$aKlumpp, Erwin$$b5
000890527 7001_ $$0P:(DE-HGF)0$$aSiemens, Jan$$b6
000890527 773__ $$0PERI:(DE-600)2968523-0$$a10.3389/ffgc.2020.577364$$gVol. 3, p. 577364$$p577364$$tFrontiers in forests and global change$$v3$$x2624-893X$$y2021
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