, Volume 7, Issue 1, pp 15-37

Ecological studies in the vegetation of the Near East Deserts II Wadi Araba

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  1. Two plant communities of Wadi Araba have been examined as to their phytosociological make up and to the hydro-ecological behaviour of their leading plants.

  2. In the Acacietum tortilidis which is composed of phanerophytes and chamaephytes, the former closely recall plants of mesophytic habitat by their high transpiration, while the chamaephytes are very thrifty in their water economy.

  3. The high transpiration rate of the Acacias has been found to be correlated with the extensive development of the root system reaching soil layers with sufficient moisture.

  4. In Haloxylonetum persici all the leading plants examined belong to the same hydro-economic type. They, however, show a transpiration rate higher than the chamaephytes of Acacietum.

  5. Contrary to Haloxylonetum, the examined leading plants of the Acacietum constitute four hydro-economical types: 1. TheAcacia type with marked increase of summer transpiration values and slight seasonal changes of osmotic values. 2. TheAnabasis type with slight seasonal changes of transpiration values and marked increase of osmotic summer values. 3.Ochradenus type with slight seasonal changes of both transpiration and osmotic values. 4.Lycium type (summer deciduous) with a marked summer increase of both transpiration and osmotic values.

Received for publication june 1953.