أهم ملامح التغير في التنوع الحيــوي بمحلية النهــود لسمات والضوابط والآثار للسنوات من 1987 ـ 2008م

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Date
2015-06-15
Authors
عصام عباس بابكر, كرار
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uofk
Abstract
The present study has discussed the Biodiversity at Alnuhud locality in Northern Kurdofan State, a subject that has grabbed the attention of the contemporary world. The study depends on a number of technologies, among which the remote sensing technology( normalized Difference vegetation index), to calculate differences in vegetation, in lands cover at1987 compared with 2005 , besides the Geographical Information systems technology to calculate the areas. The study has also relied on the results of laboratory analysis of samples and field surveys. To achieve the objectives of the study, the researcher utilized the descriptive analytical approach, statistic as well as historical methodologies; the so- called the comprehensive approach in Geography, for their significance. The study has focused on controls determining biodiversity in the study area including; the climatic, biological, pedology and topographies in order to identify the determinants of the agricultural, vegetation and animal diversity as well as diversity in birds and studying human activity as biological control, besides analyzing the reasons behind the lack in biodiversity and the consequences ensuing from that. One of the most important environmental phenomena has been desertification indicators such as Caltropis procera, Bosica senegalensi and Leptadenia pyrotechnicca plants, besides sand creeping and sand dunes. Detailed study of the climatic elements has shown that the study area is situated within the arid and semiarid areas and that climate, for its great influence, is the main control in determining the status of biodiversity. Through the laboratory study of the Grain Size analysis, the soil at Alnuhud locality was found to be sandy mixed with small gravels.The study has proved that the intensity and type of trees have witnessed a change of decrease for the last ten years as a result of the behavior of the people of the area, who lack the environmental awareness and about the significance of biodiversity and who resort to that behavior as a need to improve their situation. It is concluded that the development policies constitute the most important reasons behind the degradation in vegetation, agriculture and biodiversity in general. Although the results have indicated a 45%increase in the percentage of vegetation in cover in 2005 compared with1987, but the vegetation cover continues to decrease due to other factors affecting the NDVI value calculated for the year 1987; drought and recess in rainfall with 80% of respondents agreeing to this effect. However, the vegetation cover is existent but has and is still facing severe, threatening decrease factors that changed its map. The study has also shown the impacts resulting from the decrease in biodiversity. These impacts can be summarized as being economic, social, political and security, besides environmental effects such as desertification and flooding, the matter which has negatively reflected on both the inhabitants of the area and the area itself. The study recommends the involvement of the public to increase the vegetation cover, deal with biodiversity as a financial value as component of in the general budget, with biodiversity protection being a development target. It is finally recommend continuous research in this field, besides application of more advanced technologies for its local and global importance
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أهم ملامح التغير في التنوع الحيــوي بمحلية النهــود لسمات والضوابط والآثار
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