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۱The Present Status of the Natural Forests in the Southwestern Saudi Arabia: 3– Asir and East Jazan Forests
نویسنده(ها): ،
اطلاعات انتشار: World Applied Sciences Journal، بيست و يكم،شماره۵، ۲۰۱۳، سال
تعداد صفحات: ۱۷
Forest inventory in Asir and East Jazan area represents the third phase of the inventory project of the natural forests in southwestern Saudi Arabia. The borders of the sampling area start from Asir region''s northern border with Baha region to Bani Malik in Jazan region in the south. The forest area in Asir and East Jazan has been divided into 7 sub–regions, each with as many sites as breadth, different terrain and geographical location. Each site also included a number of sampling plots. Thus, the sampling frame of forest inventory in Asir and East Jazan has become includes 40 sites include 117 sampling plots.The results showed that total number of trees that have been counted in different sampling sites in Asir and East Jazan reached 12,441 trees, 30.6% of them is in Balqarn sub–region while the least is in East Jazan sub–region with only 1.4% of the total number of trees in the whole region. Tree density ranges between 90 and 892 trees per hectare in the East Jazan and El–Namas, respectively. Number of seedlings of the different tree and shrub species in all the sampling areas ranges between 1.3 and 27.1% in the East Jazan and Baqarn of total number of seedling in the whole area of inventory, respectively. Number of seedlings per hectare ranges between 49 and 382 in East Jazan and Ballasmar sub–regions, respectively. Number of unmeasured trees from different tree species in the sampling area accounted for 1881 tree represents 15.2% of total number of trees in the whole area of inventory. The number varied between 16 trees in East Jazan and 706 trees in Balqarn at a rate of 0.6 and 25.8% of the total number of trees found in the sampling areas, respectively. Among the unmeasured trees, the percentage of the trees affected by dieback ranges between 3.9% in South Abha and 34.6% in Balqarn, while the totally dead trees ranges between 1% and 42.5% of total number of unmeasured trees in the whole Asir and East Jazan inventory areas, for the same sub–regions, respectively. Number of tree and shrub species that have been identified in one sub–region of the forest areas in Asir and East Jazan ranges from 5 in El–Namas, Ballahmar, South Abha and East Jazan to 9 in Balqarn and Ballasmar. Regarding the dimensions of trees, average diameters of trees in different sampling sites ranges between 7.6 cm in El–Namas and 21.6 cm in East Jazan, while the average heights of trees ranges between 3.0 and 8.5 m in the same sub–regions, respectively. Finally, the approximate tree volume in different sub–regions of forest inventory areas in Asir and East Jazan ranges between 21.4 m in Ballahamr and 3 161.1 m in Balqarn represent 2.9 and 21.6% of total approximate tree volume in Asir and East Jazan areas of 3 forest inventory, respectively. On the other hand, the average approximate tree volume ranges between 0.025 and 0.818 m \tree in El–Namas and East Jazan sub–regions, respectively with an average of 0.071 m \tree for the 33 whole region.
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