Identification of Plant Species in Rawdhatumalkhfas, Riyadh Saudi Arabia by Germinable Soil Seed Bank

Al-Taisan, Wafa'a. A.
December 2012
Australian Journal of Basic & Applied Sciences;Dec2012, Vol. 6 Issue 13, p302
Academic Journal
The present study was conducted to identify plant species in RawdhatUmAlkhfas, Riyadh, Saudi Arabia using Germinable soil seed bank. The experiments were conducted (designed) in four sites and most of these seeds were germinated during the first four weeks. The average number of seedlings developed from 52 to 260/m2. This study, also, demonstrated the different amount and the installation of stocks of soil among the seeds in the four study sites. Site 1 showed the most density and diversity in vegetation and seeds stock in the soil because it has less agricultural development, while site 2 has less vegetation because it is exposed to overgrazing, urban development and frequent visitors. Site 3 contained the lowest number of seeds due to the presence on both sides of a valley stream and this is expected of the valley sweep to the seeds and growing plants in this site. Site 4 exists in more flat environment and less vulnerable to development activities, as noted increase in the number of yearbooks compare to perennials, and increasing in the average number of seeds germinated during the autumn season compare with the spring season. Comparing the plant species that have appeared in the germination experiment at the four sites with what has been confined to the natural vegetation in same locations, it shows the absence of plant species that been observed in the plant inventory record of these areas. It was also observed from this study seeds absence of some plant species, especially perennial plants, in soil samples, with the presence of these species in the plants inventory record. The results showed the lack of density and diversity of vegetation in the study locations because of the climate effect (high temperature and lack of rainfall for consecutive years), the destruction of vegetation (as a result of development activities, agricultural, pastoral and run over by cars) which affected the seed numbers in the soil inventory. The low number of seeds in the soil inventory is indicative of the threat facing the vegetation in RawdhatUmAlkhfas. Therefore, this study recommends further studies about the reasons for the non-appearance of some plant species in the germination experiments, although its presence in Flora record of study area and disappearance from the soil seed bank. Also more studies are need for the rehabilitation of some degraded sites and to raise the productivity through the implementation of some of the appropriate programs.



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