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Volume :33 Issue : 127 2007      Add To Cart                                                                    Download

The Role of Unintended Protection in the Succession and Preservation of the Plant Cover in the Middle of Saudi Arabia

Auther : Dr. Abdullatif Bin H. Al-Nafea

     The plant cover in the vicinity of the urban centers in the middle of the Kingdom of Saudi Arabia declined and degraded since the mid-twenteth century due to various human activities, especially grazing, wood cutting and agricultural & urban expansion, which has helped to exacerbate the problems of drought and environmental degradation, and upset the balance of the fragile environmental system. The protection of the fenced unused lands for the purpose of protecting the plant cover has a role in any unintended way in developing and regenerating it. This study aims at identifying the role of the unintended protection in the regeneration and preservation of the plant cover in the middle of the Saudi territories. A survey was done on two sites in the North East of Riyadh City for identifying, and numerating all the plant species, families and genus which belong to them, in addition to their life cycle, and the forms of their growth. Fifteen quadrates, each is 100 m2, have been established for identifying the vegetation characteristics of the plant cover in both sites, namely; frequency, density, coverage and the values of the relative importance. The number of the wild plant species in the first site amounted to 37 plant species belonging to 34 plant genus belonging to 18 families; while in the second site, the number of wild plant species amounted to 34 plant species in the first site amounted to 13 plant species and 11 plant species in the second site i.e. approximately 35% and 32.4% respectively. The perennial plants in the first site are represented by about 24 plant species and by about 23 species in the second one i.e. nearly 64.9% and 67.6% respectively. Pulicaria undulata was the dominant plant in the first site followed by a large difference by Heliotropium bacciferum and Rhanterium epapposum, while in the second site, Rhanterium Epapposum was the dominant plant followed by large difference by Lasiurus scindicus and Artemisia monosperma. It has been noticed in both sites that the plant cover has tended during a six-year period of protection to quick diversification and improvement with few numbers of invading perennial plan species or the undesired ones which characterized by their poor growth because they cannot stand competition on moisture and nutrients with the favorable species. On the contrary, the invading or the unfavorable plant species outside these both sites are the dominant ones with scarcity of the desired perennial plant species.

    

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