The rhizosphere in soil environments refers to the narrow zone of soil influenced by the root and exudates. Microbial populations in the rhizosphere can be 10 - 100 times larger than the populations in the bulk soil. Therefore, the rhizosphere is bathed in root exudates and microbial metabolites and the chemistry and biology at the soil-root interface is governed by biotic (plant roots, microbes) and abiotic (physical and chemical) interactions. <P> The research on biotic and abiotic interactions in the rhizosphere should, thus, be an issue of intense interest for years to come. This book, which consists of 15 chapters, addresses a variety of issues on fundamentals of microscopic levels and the impact on food chain contamination and the terrestrial ecosystem. <P> It is an essential reference work for chemists and biologists studying environmental systems, as well as earth, soil and environmental scientists. * 15 chapter book, which addresses a variety of issues on fundamentals of microscopic levels and the impact on food chain contamination and the terrestrial ecosystem.

Part I. Fundamentals of transformations and dynamics of trace elements. -- 1. Contribution of rhizospheric processes to mineral weathering in forest soils. -- 2. Mineral weathering in the rhizosphere of forested soils. -- 3. Characteristics of rhizosphere soil from natural and agricultural environments. -- 4. Metal complexation by phytosiderophores in the rhizosphere. -- 5. Effects of organic ligands on the adsorption of trace elements onto metal oxides and organomineral complexes. -- 6. Kinetics of cadmium desorption from iron oxides formed under the influence of citrate. -- 7. Biogeochemistry of soil cadmium and the impact on terrestrial food chain contamination. -- Part II. Speciation, bioavailability, and phytotoxicity of trace elements. -- 8. Speciation and bioavailability of trace metals (Cd, Cu, Ni, Pb, Zn) in the rhizosphere of contaminated soils. -- 9. Influence of willow (Salix viminalis L.) roots on soil metal chemistry: Effects of clones with varying metal uptake potential. -- 10. Fractionation and bioavailability of copper, cadmium and lead in rhizosphere soil. -- 11. Bioavailability and extractability of copper and zinc in a soil amended with pig slurry: Effect of iron deficiency in the rhizosphere of two grasses. -- 12. Binding and electrostatic attraction of trace elements to plant root surfaces. -- 13. Model development for simulating the bioavailability of Ni to the hyperaccumulator Thlaspi goesingense. -- 14. Effect of arbuscular mycorrhizal (AM) fungi on heavy metal and radionuclide transfer to plants. -- 15. Uptake and translocation of uranium by arbuscular mycorrhizal fungi under monoxenic culture conditions.

Includes bibliographical references and index.

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