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Sampling, defining, characterising and modeling the rhizosphere—the soil science tool box

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Abstract

We review methods and models that help to assess how root activity changes soil properties and affects the fluxes of matter in the soil. Subsections discuss (1) experimental systems including plant treatments in artificial media, studying the interaction of model root and microbial exudates with soil constituents, and microcosms to distinguish between soil compartments differing in root influence, (2) the sampling and characterization of rhizosphere soil and solution, focusing on the separation of soil at different distances from roots and the spatially resolved sampling of soil solution, (3) cutting-edge methodologies to study chemical effects in soil, including the estimation of bioavailable element or ion contents (biosensors, diffusive gradients in thin-films), studying the ultrastructure of soil components, localizing elements and determining their chemical form (microscopy, diffractometry, spectroscopy), tracing the compartmentalization of substances in soils (isotope probing, autoradiography), and imaging gradients in-situ with micro electrodes or gels or filter papers containing dye indicators, (4) spectroscopic and geophysical methods to study the plants influence on the distribution of water in soils, and (5) the modeling of rhizosphere processes. Macroscopic models with a rudimentary depiction of rhizosphere processes are used to predict water or nutrient requirements by crops and forests, to estimate biogeochemical element cycles, to calculate soil water transport on a profile scale, or to simulate the development of root systems. Microscopic or explanatory models are based on mechanistic or empirical relations that describe processes on a single root or root system scale and/or chemical reactions in soil solution. We conclude that in general we have the tools at hand to assess individual processes on the microscale under rather artificial conditions. Microscopic, spectroscopic and tracer methods to look at processes in small “aliquots” of naturally structured soil seem to step out of their infancy and have become promising tools to better understand the complex interactions between plant roots, soil and microorganisms. On the field scale, while there are promising first results on using non-invasive geophysical methods to assess the plant’s influence on soil moisture, there are no such tools in the pipeline to assess the spatial heterogeneity of chemical properties and processes in the field. Here, macroscopic models have to be used, or model results on the microscopic level have to be scaled up to the whole plant or plot scale. Upscaling is recognized as a major challenge.

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Authors and Affiliations

  1. Swiss Federal Institute for Forest, Snow, and Landscape Research WSL, Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland

    Jörg Luster

  2. Center of Life and Food Sciences Weihenstephan, Division of Forest Nutrition and Water Resources, TU München, 85354, Freising, Germany

    Axel Göttlein

  3. Empa-Swiss Federal Laboratories for Materials Testing and Research, CH-9014, St. Gallen, Switzerland

    Bernd Nowack

  4. Environmental Geochemistry Group, LGIT, Université J. Fourier and CNRS, 38041, Grenoble Cedex 9, France

    Géraldine Sarret

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  1. Jörg Luster
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  2. Axel Göttlein
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  4. Géraldine Sarret
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Correspondence to Jörg Luster.

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Luster, J., Göttlein, A., Nowack, B. et al. Sampling, defining, characterising and modeling the rhizosphere—the soil science tool box. Plant Soil 321, 457–482 (2009). https://doi.org/10.1007/s11104-008-9781-3

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