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Accueil du site → Doctorat → États-Unis → 1983 → FOURWING SALTBUSH (ATRIPLEX CANESCENS [PURSH] NUTT.) GERMINATION AND ESTABLISHMENT UNDER ARID ENVIRONMENTAL CONDITIONS OF SAUDI ARABIA.

UNIVERSITY OF NORTHERN COLORADO (1983)

FOURWING SALTBUSH (ATRIPLEX CANESCENS [PURSH] NUTT.) GERMINATION AND ESTABLISHMENT UNDER ARID ENVIRONMENTAL CONDITIONS OF SAUDI ARABIA.

HEDAITHY, SALEH SULAIMAN M.,

Titre : FOURWING SALTBUSH (ATRIPLEX CANESCENS [PURSH] NUTT.) GERMINATION AND ESTABLISHMENT UNDER ARID ENVIRONMENTAL CONDITIONS OF SAUDI ARABIA

Auteur : HEDAITHY, SALEH SULAIMAN M.,

Université de soutenance : UNIVERSITY OF NORTHERN COLORADO

Grade : Doctor of Philosophy (PhD) 1983

Résumé
The objectives of this study were to conduct an autecological investigation of fourwing saltbush (Atriplex canescens (Pursh) Nutt.) in the Al-Gassim region of Saudi Arabia, upon which range rehabilitation could be based. Germination, seedling, transplanting, and water relation characteristics of the species under controlled and field conditions were determined. Most of the field work was conducted at plain and sand dune areas of the Al-Gassim, Saudi Arabia, and supplemented with growth chamber experiments. Seeds of tetrapolid and diploid forms, native to the United States, were introduced to Saudi Arabia, and their performance was determined. The Al-Gassim soil and climatic features were analyzed. Laboratory and field tests proved that fourwing saltbush was able to become established under and tolerate wide ranges of soil and harsh climatic conditions as found in the Al-Gassim. The best temperature range for germination was 15 to 35 C. High salinity in the soil of the plains area was found to be the only soil character that slightly decreased seedling growth, but germination and survival behaviors were not affected. The adaptation to extreme environmental conditions coupled with its known high nutritional forage values makes fourwing saltbush a valuable range plant in the arid regions of Saudi Arabia. As demand on rangeland increases, improved forage plants must have drough and salinity resistance mechanisms, and improved range management techniques should be used to achieve optimum returns.

Mots-clés : ENVIRONMENTAL SCIENCES ; DESERTS ; REVEGETATION ; SHRUBS ; PLANT GROWTH ; COMPARATIVE EVALUATIONS ; FORAGE ; GERMINATION ; LAND RECLAMATION ; SAUDI ARABIA ; SEEDS ; ANIMAL FEEDS ; ARID LANDS ; ASIA ; FOOD ; GROWTH ; PLANTS

Présentation (Sci Tech Connect)

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