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Register a new userThe natural environment of Panicumturgidum Forssk at the eastern province of Saudi Arabia
البيئة الطبيعية لعشيرة الثمام (Panicum turgidum Forssk) في المنطقة الشرقية بالمملكة العربية السعودية
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نفذت هذه الدراسة لتحديد البيئة الطبيعية لعشيرة الثمام بالمنطقة الـشرقية مـن المملكـة العربيـة السعودية، حيث تم اختيار ثلاث مناطق للبحث بطريقة عشوائية تمثل البيئـة الدقيقـة لعـشيرة الثمـام، تتمركز هذه المناطق على طريق العقير، طريق الرياض، طريق الدمـام. أخذ 48 موقعاً بالمناطق الـثلاث (16موقعاً بكل منطقة)، مساحة كل موقع 25 م2 ،عبارة عن قطاع خطي بطول 25م و عرض متر واحد. أظهرت النتائج أن الأنواع النباتية التي صاحبت عـشيرة الثمـام هـي ,conglomertus Cyperus Eragrostis barrelieri, Haloxylon persicum, Haloxylon salicornicum, Heliotropium bocciferum, Launaea mucronata, Leptadenia pyrotechnica, Monsonia nevia, Plantago ovata كما أثبتت نتائج الدراسة أن نبات الثمام ينمو بنجاح في الأراضي الرملية و يتحمل الجفاف و ملوحـة التربة. أفادت نتيجة تحليل الانحدار المرحلي أن رقم الأس الهيدروجيني للتربة و محتواها من كربونـات الكالسيوم و المادة العضوية و نسبة الرمل (القوام) و الرطوبة و درجـة التوصـيل الكهربـي كانـت أكثـر خصائص التربة تحديداً و تأثيراً في توزيع نباتات الثمام طبيعياً بمناطق الدراسة.
The present study aimed to evaluate the ecological and phytosociological status of panicum turgidum under the environmental conditions of the eastern province of Kingdom of Saudi Arabia. 48 stands (each of 25 m2, i.e. 1x25 m) were randomly selected from three locations (Riyadh, Ogair and Damam) which represent the optimum habitat of P. turgidum. The obtained results showed that the dominated plant species associated with P. turgidum were Cyperus conglomertus, Eragrostis barrelieri, Haloxylon persicum, Haloxylon salicornicum, Heliotropium bocciferum, Launaea mucronata, Leptadenia pyrotechnica, Monsonia nevia and Plantago ovata. P. turgidum, and is recommended as an important grazing vegetation in deep sand soil. Soil salinity (ECe), soil PH, CaCO3, organic matter, soil texture (Sand %) and soil moisture (FC) were the most limiting soil properties affecting P. turgidum distribution naturally at the studied area.
References used
Abbadi, G. A. andM. A. El-Sheikh (2002). Vegetation analysis of Failaka island (Kuwait). Journal of Arid Environments, 50: 153 – 165
AbdEl-Ghani, M. M. (2000). Floristics and environmental relations in two extreme desert zones of Western Egypt. Global Ecology & Biography 9, 499-516
Abou-Deya, I.B. (1984). Studies on distribution and adaptation of range plants in Sinai. Ph.D Thesis, Fac. Of Agric., Ain Shams Univ., Cairo, Egypt
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The present study aimed to evaluate the productinty status of panicum
turgidum (Thumam) under the environmental conditions of the eastern
province of Kingdom of Saudi Arabia. Forty eight experimental sites (each of
25 m2, i.e. 1*25 m) were randoml
y selected from three locations (Roads of
Riyadh, Ogair and Damam), which represent the micro-environment of
thumam. Obtained results showed that the dominated plant species associated
with thumam were Eragrostis barrelieri, Haloxylon salicornicum, Leptadenia
pyrotechnica, Plantago ovata and Zygophyllum coccineum. The forage
production of thumam was 57 kg dry matter/ha. However, the nutrient value of
it was relatively low due to the low protein content (4.2 %) and high crude fiber
(30.2 %). Moreover, neutral detergent fiber was 62.4 %, acid detergent fiber
was 65.4 % and lignin was 11.70 % which indicate low nutritional forage value,
compared with traditional forage crops, i.e. Rhodesgrass (Chloris gayana) and
Alfalfa ( Medicago sativa). Macronutrient contents (Na, K, Ca and Mg) were in
the range of sheep and camel requirements, while P was very low as well as
micronutrients (Zn, Cu and Mn).
البروتين
Protein
المادة الجافة
Dry Matter
المملكة العربية السعودية
المنطقة الشرقية
الثمام
Eastern province
Soil drought and salinity
جفاف التربة و ملوحتها
إنتاجية علف الثمام
محتوى الثمام من العناصر الكبرى و الصغرى
نوعية علف الثمام
Thumam
Panicum turgidum
Sandi Arab Kingdom
Thumam forage production
Macro and micro nutrients confent
Thumam forage quality
المزيد..
Many of studies try to analyze the relation between human and environment
which divided to physical environment and intellectual environment. Both
of them represented the tow environments -Natural and Cultural-. two
environments in this thesis wer
e not limitation but it’s a potential power.
This affective role on the urban designers will create a positive relation
between public-private concept and the structure of the urban space. But
this relation required being, because the being is structured and that
meaning of the single situation consists in its relationship to the general
structures.
This study aimed at investigating the image of women in Arabic
language and social studies textbooks of primary and middle stages
through the roles of women, the different social aspects and social status
presented in the textbooks of Arabic langu
age and social studies.
This study aimed at investigating the effect of a computerized
programme on changing alternative concepts in science among second
intermediate grade students in the Kingdom of Saudi Arabia in “motion
and sound units”. A puroseful sample of (90) st
udents was selected and
students were randomly assigned to two groups: the experimental group
which was taught “motion and sound” by the computerized programme,
and the control group which was taught the same two units by the
traditional method.
This investigation was carried out at the experimental Station of the College
of Agriculture and Veterinary Medicine, King Saud University, Al-Qassim,
Saudi Arabia, during the growing season 2001/2002. The objectives of the
research were to study
and evaluate the productivity, morphological and
physiological behavior of alfalfa (Medicago sativa L.) plants grown under palm
trees environment.
The results proved the important effects of palm trees shading on alfalfa
growth, development and productivity. Significant differences were observed
between the control treatment and the two other treatments. The results also
showed a significant increase in fresh and dry weight and quality
characteristics except for fat percentage. This percentage increased gradually
from treatment 1, which was located under palm trees, to treatment 2, which
was located between palm trees to the control treatment, which was located
away from palm trees, where there was no shading. The morphological and
physiological characteristics did not significantly change in spite of the existed
changes among their means.
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