Drylands and SRT types

 

Drylands and SRT types

This map shows which drylands belong to the SRT2 category (requiring vulnerability and risk reduction) and which ones to the SRT3 category (with possibilities for sustainable intensification). The subdivision is entirely based on the value of the aridity index (ratio of mean annual precipitation over mean annual potential evapotranspiration), with a value below 0.35 for SRT2 areas and equal to or greater than 0.35 for SRT3 areas. This is by necessity a gross simplification as production and livelihood systems’ vulnerability and intensification potential are not only determined by a simple climatic indicator but, perhaps more importantly, by socioeconomic factors as well. However, the latter are difficult to put on a map and there is no denying that in drylands the moisture regime is a major determinant of vulnerability and intensification potential.  To accommodate irrigated areas in very dry areas an intermediate category  (SRT2-irrigated), which may have aspects of both vulnerability (e.g. depleting water resources, salinization) and intensification potential (e.g. water saving technologies, addressing yield gaps).

This map shows which drylands belong to the SRT2 category (requiring vulnerability and risk reduction) and which ones to the SRT3 category (with possibilities for sustainable intensification). The subdivision is entirely based on the value of the aridity index (ratio of mean annual precipitation over mean annual potential evapotranspiration), with a value below 0.35 for SRT2 areas and equal to or greater than 0.35 for SRT3 areas. This is by necessity a gross simplification as production and livelihood systems’ vulnerability and intensification potential are not only determined by a simple climatic indicator but, perhaps more importantly, by socioeconomic factors as well. However, the latter are difficult to put on a map and there is no denying that in drylands the moisture regime is a major determinant of vulnerability and intensification potential.  To accommodate irrigated areas in very dry areas an intermediate category  (SRT2-irrigated), which may have aspects of both vulnerability (e.g. depleting water resources, salinization) and intensification potential (e.g. water saving technologies, addressing yield gaps).

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