Current status, uncertainty and future needs in soil organic carbon monitoring

Increasing human demands on soil-derived ecosystem services requires reliable data on global soil resources for sustainable development. The soil organic carbon (SOC) pool is a key indicator of soil quality as it affects essential biological, chemical and physical soil functions such as nutrient cycling, pesticide and water retention, and soil structure maintenance. However, information on the SOC pool, and its temporal and spatial dynamics is unbalanced. Even in well-studied regions with a pronounced interest in environmental issues information on soil carbon (C) is inconsistent. Several activities for the compilation of global soil C data are under way. However, different approaches for soil sampling and chemical analyses make even regional comparisons highly uncertain. Often, the procedures used so far have not allowed the reliable estimation of the total SOC pool, partly because the available knowledge is focused on not clearly defined upper soil horizons and the contribution of subsoil to SOC stocks has been less considered. Even more difficult is quantifying SOC pool changes over time. SOC consists of variable amounts of labile and recalcitrant molecules of plant, and microbial and animal origin that are often operationally defined. A comprehensively active soil expert community needs to agree on protocols of soil surveying and lab procedures towards reliable SOC pool estimates. Already established long-term ecological research sites, where SOC changes are quantified and the underlying mechanisms are investigated, are potentially the backbones for regional, national, and international SOC monitoring programs. © 2013 Elsevier B.V.

Modelos conceptuales de estrategias para la promoción de las exportaciones a nivel nacional y de las empresas = Conceptual models for export promotion strategy at the national and enterprise levels

Incluye Bibliografía

Regional and international migration in the Caribbean and its impact on sustainable development: compendium on recent research on migration in the Caribbean

Includes bibliography

Emigration of nurses from the Caribbean: causes and consequences for the socio-economic welfare of the country, Trinidad and Tobago: a case study

Includes bibliography

Agricultura, comercio exterior y cooperación internacional = Agriculture, external trade and international co-operation

Incluye Bibliografía

Restructuring and international competitiveness: the Mexican automobile industry

Includes bibliography

Evaluation of e-readiness indices for Latin America and the Caribbean

Includes bibliography

Children and international migration in Latin America and the Caribbean

Child migration in the region has many contradictory aspects, as reported in the feature article of this bulletin. On the positive side, there are better educational opportunities in countries of destination and, in countries of origin, greater well-being thanks to remittances; greater protection gained by migrating away from situations of violence and social risk; and new horizons for broadening life experiences. On the negative side, there are precariousness and heightened family environment risks when the parents migrate and the children are left behind in the care of others; exposure to abuse and violation of rights during migratory processes; and possibly lower citizen status in receiving countries.