Africa's drylands: "An ounce of prevention is worth a pound of cure"

Africa is extremely dry, 43 % of the continent's landmass is classified as drylands and is under continuous threat from erosion and nutrient mining. Climate change may still aggravate this situation. Several major regions are impacted and more than 40 % of the continent's populations, 268 million people live in dryland areas. Dryland people are resilient having developed adaptation strategies to cope with the very variable environmental and climatic conditions. Yet, drylands are often seen as non-productive lands and their importance and contributions to the livelihoods of millions of people are not given sufficient attention. The perception exists that little can be done to sustainably raise productivity. However, Africa's drylands have high potential for development and can provide multiple goods and services. Within the EU-INCO Agricultural Innovation in Dryland Africa (AIDA) project, 22 case studies were evaluated and surveys were conducted among policymakers and researchers to identify key drivers for success and policy options that can promote investments in Africa's drylands. Results show that there is need for harmonization of policies and interventions in drylands which should reflect realities that dryland people face; ensure compatibility with land tenure issues; reduce resource-based conflicts and pave the way for more trade exchanges. Traditional users and owners of the drylands must be involved in policy development, programme planning and research design. Research in support of drylands agriculture should be participatory and reflect the diversity of indigenous adaptation strategies. Communication is key to success and for dissemination of existing practices for the development of local innovation. (Texte intégral

Developing fencing policies in dryland ecosystems

The daily energy requirements of animals are determined by a combination of physical and physiological factors, but food availability may challenge the capacity to meet nutritional needs. Western gorillas (Gorilla gorilla) are an interesting model for investigating this topic because they are folivore-frugivores that adjust their diet and activities to seasonal variation in fruit availability. Observations of one habituated group of western gorillas in Bai-Hokou, Central African Republic (December 2004-December 2005) were used to examine seasonal variation in diet quality and nutritional intake. We tested if during the high fruit season the food consumed by western gorillas was higher in quality (higher in energy, sugar, fat but lower in fibre and antifeedants) than during the low fruit season. Food consumed during the high fruit season was higher in digestible energy, but not any other macronutrients. Second, we investigated whether the gorillas increased their daily intake of carbohydrates, metabolizable energy (KCal/g OM), or other nutrients during the high fruit season. Intake of dry matter, fibers, fat, protein and the majority of minerals and phenols decreased with increased frugivory and there was some indication of seasonal variation in intake of energy (KCal/g OM), tannins, protein/fiber ratio, and iron. Intake of non-structural carbohydrates and sugars was not influenced by fruit availability. Gorillas are probably able to extract large quantities of energy via fermentation since they rely on proteinaceous leaves during the low fruit season. Macronutrients and micronutrients, but not digestible energy, may be limited for them during times of low fruit availability because they are hind-gut fermenters. We discuss the advantages of seasonal frugivores having large dietary breath and flexibility, significant characteristics to consider in the conservation strategies of endangered species

Desertification and Climate Change in Africa

Desertification has increased in African drylands in recent decades, led by land use change, climatic variability and poor land management practices. People living in drylands in Africa are highly vulnerable to desertification and climate change, because of their impacts on a wide range of livelihood based resources. Desertification and climate change affect gender disproportionately, with women and youth being the most affected. Without implementation of adequate measures, climate change will exacerbate the vulnerability to desertification among dryland populations in Africa. Policy responses and integrated land management practices, as well as indigenous and local knowledge are needed to consider the complex and multi-faceted nature of causes and effects of desertification

Reviewing the International Year of Deserts and Desertification 2006: What contribution towards combating global desertification and implementing the united nations convention to combat desertification?

During the United Nations General Assembly's 58th Ordinary Session in 2003, a decision was adopted declaring 2006 the International Year of Deserts and Desertification (IYDD). This paper critically reviews this International Year. It draws on the key outputs from IYDD events from across the globe to highlight the challenges and ways forward in both combating desertification and implementing the United Nations Convention to Combat Desertification (UNCCD). The paper considers what the IYDD outputs mean for the current and historical controversies surrounding the desertification issue and presents an overall evaluation of the successes of IYDD for the different stakeholder groups within the desertification regime. It is concluded that while the International Year can be considered to have met the United Nations's four objectives: to address the long-term oriented implementation of the UNCCD; raise awareness of the implications of desertification; facilitate networking with all stakeholders; and disseminate information relating to the UNCCD, the real challenge lies in moving the IYDD outcomes away from the conferences, meetings and networks that contributed to their generation, towards a more concrete, tangible effort to conserve deserts and effectively monitor and control desertification and land degradation on the ground

Guidelines on sustainable forest management in drylands of Ethiopia

About 80% of forests in Ethiopia are dry forest. For the last 20 years they have been subject to land use changes, and replaced by agricultural land and settlements. This situation may be due to the little recognition, at the national level, of the actual and potential contribution of dry forests to the national economy, especially as a source of income for the poor and for exportation. Despite this situation, the Government of Ethiopia has made sustainable forest management a priority, and it includes the management of dry forests. This Guidelines on Sustainable Forest Management in Drylands of Ethiopia provides information on the national context on dry forests, and practical guidelines adapted to the Ethiopian context. It fills important gaps that should help decision-makers to understand better the role and value of dry forests in the country. It shows that dry forests should be sustainably managed and protected for all the economic, social, and environmental services that they provide, and pleads for a better recognition of such an important ecosystem

Forest landscape restoration in the drylands of Latin America

Forest Landscape Restoration (FLR) involves the ecological restoration of degraded forest landscapes, with the aim of benefiting both biodiversity and human well-being. We first identify four fundamental principles of FLR, based on previous definitions. We then critically evaluate the application of these principles in practice, based on the experience gained during an international, collaborative research project conducted in six dry forest landscapes of Latin America. Research highlighted the potential for FLR; tree species of high socioeconomic value were identified in all study areas, and strong dependence of local communities on forest resources was widely encountered, particularly for fuelwood. We demonstrated that FLR can be achieved through both passive and active restoration approaches, and can be cost-effective if the increased provision of ecosystem services is taken into account. These results therefore highlight the potential for FLR, and the positive contribution that it could make to sustainable development. However, we also encountered a number of challenges to FLR implementation, including the difficulty of achieving strong engagement in FLR activities among local stakeholders, lack of capacity for community-led initiatives, and the lack of an appropriate institutional and regulatory environment to support restoration activities. Successful implementation of FLR will require new collaborative alliances among stakeholders, empowerment and capacity building of local communities to enable them to fully engage with restoration activities, and an enabling public policy context to enable local people to be active participants in the decision making process. © 2012 by the author(s). Published here under license by the Resilience Alliance

A Framework to Assess Returns on Investments in the Dryland Systems of Northern Kenya

Governments need quantitative assessments of the outcomes of proposed investments so they can weigh the merits of each option. Without these, there is a risk that some proposed changes could in fact reduce rather than increase benefits to the economy and society. At present, there is no definitive framework for assessing the returns to Northern Kenya's predominantly pastoralist land use, nor any prediction of its returns under anticipated climate changes. There is therefore no possibility of comparing returns between this and any alternatives. Flagship projects planned to accelerate economic development in Northern Kenya include an international transport corridor, a resort city and an international airport. In addition, mineral deposits are being discovered, towns are growing across both arid and semi-arid areas, and land speculation is increasing. The county governments are faced with the task of prioritising investments which can do the most to improve living standards for local people. This paper is intended to stimulate and contribute to a discussion of how the returns on land-based investments in the drylands should be evaluated. It presents an assessment framework for weighing the total economic value of the ecosystem services provided by pastoral and mixed land-use systems under anticipated climate changes and variability. The proposed framework draws on contributions from previous research at IIED and by other research partners focusing on ecosystem service assessment in Northern Kenya and surrounding dry regions. The paper reviews the current state of knowledge on the returns from pastoral and other land uses in the region, identifies research gaps and highlights the next steps needed for implementing the framework

Climate change reduces extent of temperate drylands and intensifies drought in deep soils

Drylands cover 40% of the global terrestrial surface and provide important ecosystem services. While drylands as a whole are expected to increase in extent and aridity in coming decades, temperature and precipitation forecasts vary by latitude and geographic region suggesting different trajectories for tropical, subtropical, and temperate drylands. Uncertainty in the future of tropical and subtropical drylands is well constrained, whereas soil moisture and ecological droughts, which drive vegetation productivity and composition, remain poorly understood in temperate drylands. Here we show that, over the twenty first century, temperate drylands may contract by a third, primarily converting to subtropical drylands, and that deep soil layers could be increasingly dry during the growing season. These changes imply major shifts in vegetation and ecosystem service delivery. Our results illustrate the importance of appropriate drought measures and, as a global study that focuses on temperate drylands, highlight a distinct fate for these highly populated areas

Climate and Land Degradation

On the occasion of the Seventh session of the Conference of Parties, The World Meteorological Organization (WMO) has prepared this brochure which explains the role of different climatic factors in land degradation and WMO's contribution in addressing this important subject. Educational levels: Undergraduate lower division, Undergraduate upper division, Graduate or professional, Informal education, General public