Land Productivity Dynamics in Sahel
Humans need increasingly more biomass for food, fodder, fiber and energy. In Africa, circa 22% of the vegetated land surface showed a decline or unstable land productivity between 1999 and 2013. Persistent reduction of land productivity points to long-term alteration of the health and productive capacity of the land, which are characteristic of land degradation. It has impact on ecosystem services and benefits, thus on the sustainable livelihoods of human communities. This map shows the dynamics of (vegetated) land productivity over a time period, in other terms the trajectories of above-ground biomass. It reflects changes in ecosystem functioning e.g. vegetation growth cycles due to natural variation and/or human intervention, and can be associated with processes of land degradation or recovery. The 5 classes depict two levels of persistent productivity decline, one level of instability or stress in capacity, one level of stable productivity and one level of increased productivity.
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Rotllan-Puig, X., Ivits, E. and M. Cherlet. 2021. 'LPDynR: a new tool to calculate the Land Productivity Dynamics indicator'. Ecological Indicators, 133: 108386. https://doi.org/10.1016/j.ecolind.2021.108386
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To identify critical land degradation zones, land productivity must be analyzed within the context of land use practices and other environmental changes, such as rainfall and atmospheric fertilization. Also, an increased productivity is sometimes achieved at the cost of other land resources, such as water or soil, in which case it can lead to degradation, which is observable only in later stages.
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