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Part 1: Introduction
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Wadis:
these are the arid valleys, with mud plains generally
located along their banks. The valleys contain significant
vegetated areas, particularly trees and perennials. They also
provide important habitats for several fauna species.
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Main Escarpment:
These are rugged cliffs, which are
considered as important tourism areas because of their high
scenic values. They are usually covered by a weather resistant
limestone layer. Vegetation includes mainly shrubs and
ground covers.
Plants and Climate:
Almighty Allah has provided for a large range of plant species
that exist and have adapted to the relevant local environmental
conditions. Among these are species suitable for the urban
landscapes of the cities and towns within the Arriyadh region.
One of the most important considerations for the success of
greening and afforestation works is the selection of the suitable
plant species that can withstand the harsh environmental
conditions of the Arriyadh region. The selection criteria for
plant species needs to take account of the suitability of the local
habitat including ground and climate conditions. Particularly
important is the soil quality and the extent and availability of
irrigation water.