Soil organic matter is a reservoir for plant nutrients, provides water-holding capacity, stabilizes soil structure against compaction and erosion, and thus determines soil productivity. All agriculture to some degree depends on soil organic matter. It has long been known that soil organic matter declines when land is taken into cultivation, and that the productivity of new agricultural land is governed by fertility contributions from decomposing natural organic matter. The expansion of agriculture to ever new and more fragile lands, particularly in tropical and developing regions, causes environmental degradation with local effects on soil quality, regional effects on landscape integrity and water quality, and global effects on carbon cycles and the atmosphere. This book summarizes current knowledge of the properties and dynamics of soil organic matter in the tropics, its role in determining soil quality, its stability and turnover, and the options for management in the context of tropical landuse systems, for a readership of resource scientists, economists and advanced students. Maintenance of organic matter is critical for preventing land degradation. Case studies and practical applications are therefore an important part of the book, as are the exploration of future directions in research and management.
Targeted at Library and Information Science (LIS) professionals, this book concentrates on usability evaluation methods used to design usable and user-centered library websites. Aimed at the practitioner, it is a practical guide to methods that are used to gather information from potential users that shape the design of the website based on an interactive design process. From planning the study to writing the report, this book guides the reader through the process of usability evaluation using examples from the author's experience with usability evaluation of library interfaces. It describes usability techniques, procedures, report writing, and design changes that lead to a user-centered interface.
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