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000840438 1001_ $$00000-0003-2284-9593$$aBauke, S. L.$$b0$$eCorresponding author
000840438 245__ $$aBiopore effects on phosphorus biogeochemistry in subsoils
000840438 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2017
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000840438 520__ $$aBiopores are characterised by high concentrations of plant available nutrients and provide preferential pathways for root growth into the subsoil, thereby potentially enabling plants to access phosphorus (P) resources located in the subsoil. Here, we sampled biopores from a replicated agricultural field trial in Klein-Altendorf, Germany, to analyse their nutrient composition and P speciation as determined by Hedley sequential extraction and X-ray absorption near edge structure (XANES) spectroscopy. In addition, we analysed the oxygen isotopic composition of HCl P (δ18OHCl P) as an indicator of long-term effects of biological P turnover. We found that biopore effects were most pronounced in the subsoil, where the concentration of easily extractable (labile) P tended to be greater in biopores than in bulk soil, as evident in both Hedley sequential extraction and XANES spectroscopy. We assume that these findings result from inputs of organic matter from the topsoil as well as an input of Ca-particles into subsoil biopores by earthworm activity. Biologically cycled P was subsequently precipitated as Ca-P as evident by δ18OHCl P values close to equilibrium in biopores even at great depths. When incubating bulk soil samples with 18O-labelled water, however, we observed a significant increase of δ18OHCl P values in the topsoil, but only small if any changes of δ18OHCl P values in the subsoil. Thus, biopores present hotspots of P cycling in the subsoil, but the effect of biopores on overall P turnover in the bulk subsoil is limited.
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000840438 7001_ $$0P:(DE-HGF)0$$avon Sperber, C.$$b1
000840438 7001_ $$0P:(DE-Juel1)164361$$aSiebers, N.$$b2
000840438 7001_ $$0P:(DE-HGF)0$$aTamburini, F.$$b3
000840438 7001_ $$0P:(DE-Juel1)129427$$aAmelung, W.$$b4
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