By Professor Dr. A. De Philippis (auth.), R. N. Kaul (eds.)
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Extra info for Afforestation in Arid Zones
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Until 1950, the preparation of land for afforestation followed a set pattern of digging 40 cm 3 pits at regular intervals in order to obtain a density of 2,000 to 2,500 pits per hectare. A more efficient preparation of land was being carried out in case of very steep slopes which facilitate the run off of rain water. The pits are covered with the surrounding surface soil-freed from stones and vegetation. The arrangement is such as to form a plain surface or bed of 80 X 80 cm around the pit. The centre of the filled pit is provided with a slight counterslope, that is to say the surface of the bed assumes a slope opposite to that of the land in order to prevent the accumulated rain water on the bed from escaping over the slope, and at the same time not allowing the retained moisture to come in contact with undesired vegetation so as to avoid the formation of crusts or cakes as happens in clayey soil.
Madrid. BRAUN BLANQ,UET,]. & O. BOLOS. 1957. Les groupements Vegetaux du Bassin Moyen de L'Ebre et leur dynamisme. Anal. Estaci6n Exp. Aula Dei. 5. BROCKMAN ]EROSCH, H. & E. RUBEL. 1912. Die Eintei1ung der Pftanzengesellschaften nach oeko1ogisch physiognomischen Gesichtspunkten. Leipzig. DIRECCION GENERAL DE AGRICULTURA. Mapa de cultivos y aprovechamientos de Espana. INSTITUTO GEOGRAFICO y CATASTRAL. 1964. 000. Madrid. INSTITUTO GEOLOGICO y MINERO DE ESPANA. 1965. 000. Madrid. KERNAN, H. S. 1966.
Salty), Diplotaxis harra (Forssk). Boiss. ) o. Kuntze. (Salty), Mesembrianthemum nodifiorum L. ) Paug. E. Br. var. hispanica (De Coincy) Maire. (c) Species existing in the subregions III and III (IV) but which are also found in other xerophytic and hot Mediterranean subregions, principally IV (III), IV1 and IV 2. ) Bge. ) Mill. (Sandy), Lycium intricatum Boiss. (Salty), Nerium oleander L. (Subterranean water), Punica granatum L. (Exotic), Phoenix dactylifera L. ) Mill. (Introduced and afforested) and Pinus halepensis Mill.
