Distribution of phosphorus concentration in two German forest soils from the nanometer- to the profile scale

Florian Werner1, Carsten W. Müller1, Jörg Prietzel1
1 Technische Universität München

O 9.5 in Critical unknowns in the cycling of P in forest, grassland and wetland ecosystems

17.07.2014, 10:20-10:40, H20

Despite new methods to identify and quantify phosphorus (P) in different binding forms, our knowledge about important soil biogeochemical processes such as e. g., P transformation and storage in soils is still limited. In recent years, it has become apparent that soil micro- and nano-structure highly affect the availability and allocation of P in soils. Widely used extrac­tion methods which obtain information about binding forms of P can help to locate the main P fractions at a centimeter scale. Novel techniques such as Secondary Ion Mass Spectrometry at the nano scale (NanoSIMS) can be used to reveal the nano-distribution of P, and by correla­tion with the distribution of other elements (Fe, Al, Si, C) additionally provide some informa­tion about P speciation. Combining both methods can furthermore lead to a more detailed in­sight of P distribution in soils.

We present data on the spatial distribution of different P forms in two German soils which are end-members of a P supply gradient, from the nano- to the profile scale. Cluster, correlation, and factor analysis are combined to determine P binding patterns in the investigated soils. Moreover, we shortly discuss the capabilities and limitations of the used methods and the scale-dependency of the observed P distribution patterns.

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Letzte Änderung 03.04.2014