Assessing Recent Soil Erosion Rates through the Use of Beryllium-7 (Be-7)

Dr. Lionel Mabit specializes in the use of radiotracers and conventional techniques to evaluate the agronomic impact of soil degradation particularly soil erosion. He obtained his PhD degree from the University of Paris I Sorbonne in January 1999.Throughout his career, he has collaborated with numerous scientific teams all around the world in agro-environmental studies that use isotopic and traditional techniques to assess or determine soil and sediment redistribution magnitude at various scales. His activities cut across physical geography, geology, soil sciences and radioecology. He is the author or co-author of more than 50 scientific and technical articles.Since 2005, Lionel has served as soil scientist in the Soil and Water Management & Crop Nutrition Laboratory of the Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture and conducts research activities to develop protocols and guidelines on the use of isotopic and nuclear techniques in the field of climate-smartagriculture. Currently, his primary area of research is the development and refinement of isotopic fingerprints to quantify and localise the origin of sediment within agro-ecosystems for supporting the implementation of climate smart agriculture. In addition, as project officer he leads and coordinates the research and development activities of the IAEA coordinated research project (CRP) D1.50.17 on "Nuclear Techniques for a Better Understanding of the Impact of Climate Change on Soil Erosion in Upland Agroecosystems".William Blake is Professor of Catchment Science at the University of Plymouth, UK, with research interests in soil erosion, its downstream impacts and associated land management challenges. He obtained his PhD at the University of Exeter in December 2000 based on research into the use of 7Be as a tracer in sediment budget investigations. He has published over 80 scientific articles. He specialises in the application of sediment tracing technologyto examine fine sediment sources and budgets in river basins and the onsite and downstream impacts of soil erosion within the food-water-energy-environment nexus. This has involved development and application of tools utilising fallout radionuclides, mineral magnetics, geochemistry and biomarkers to explore catchment response to disturbance in UK, Australia, SE Asia and most recently East Africa and Latin America. Since 2008, he has worked closely with Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture though Coordinated Research Programmes (CRP), concerning application of isotopic and nuclear techniques in river basins, and delivery of training courses on 7Be as a tracer. He currently leads interdisciplinary research projects in Tanzania and Chile, integrating natural science and social science evidence to support co-design of pathways to land management change.

• Foreword.- Chapter 1. The use of beryllium-7 as a soil and sediment tracer.- Chapter 2. How to design a beryllium-7 based soil distribution study at the field scale: a step-by-step approach.- Chapter 3. Measurement of 7Be in environmental materials.- Chapter 4. Conversion of 7Be activity concentrations into soil and sediments redistribution amounts.- Chapter5. Research into practice – linking 7Be evidence to land management policy change for improved food security.