Arid zone forestry

Arid Zone specificity

Drylands include all terrestrial regions where the production of crops, forage, wood and other ecosystem services are limited by water. Formally, the definition encompasses all lands where the climate is classified as dry subhumid, semiarid, arid or hyper-arid, showing an increasing level of aridity or moisture deficit. This classification is based on Aridity Index val.

Dryland systems are ecosystems characterised by a lack of water. They include cultivated lands, scrublands, shrublands, grasslands, savannas, semi-deserts and true deserts. The lack of water constrains the production of crops, forage, wood, and other ecosystem services. Present-day Drylands and their categories
http://www.greenfacts.org/en/desertification/figtableboxes/appendix-a.htm