Abstract:
Water relations of some xerophytes have been studied in both summer and winter seasons and in
three areas in Riyadh; Ancient Diriyah, Janadriah and Muzahmiah. The results showed that
transmittance in plants are higher during summer than in winter. Most of plants recorded the
highest degree of water content and succulence in winter, except in some plants such as,
Capparis spinosa, Cassia italica, Rhazya stricta where the blossoming season was in summer
period. The lack of saturation values recorded an increase in summer than in winter, where
Zygophyllum migahidii recorded lower values in terms of lack of saturation since it is a sappy
plant, while Zilla spinosa recorded the highest values in terms of lack of saturation. There was a
discrepancy in osmosis of cellular juice in various plants; some of which recorded higher value
in summer while the others recorded the highest value in winter. With regard to all plants, the
difference, in both summer and winter, did not exceed -3 bars. |
