Field Investigation of the Spectral Resolution of Soil Salinity and Its Impact on Vegetation Northeast of the Nile River Delta by Applying Geoinformatics Techniques

نوع المستند : المقالة الأصلية

المؤلف

geography dep. ,faculty of arts, port said unv., port said, Egypt.

المستخلص

Abstract
The study adopts a number of soil salinity indices by applying geoinformatics techniques in the northeast of the Nile River Delta, based on the different spectral reflectance of soil salinity. The field investigation is carried out by collecting soil samples, and chemically analyzing them in order to compare them with the results of the indices (8 indices), relying on field review so as to capture images indicative of soil salinity and its impact on the land use that is most vulnerable to it, and this is vegetation. This is mainly for the sake of supporting the accuracy of the spectral resolution. It is found that each index relies on different variables of spectral reflectance. Accordingly, the study identifies the most appropriate and effective indices for assessing salinity, both spatially and temporally, in the northeast of the Nile River Delta. This is done through determining the highest degree of correlation between the results of the indices and the results of the chemical analysis of soil samples. Moreover, the study relies on the best indices in determining vegetation, which is EVI, so as to find out the degree to which the vegetation density is affected by soil salinity. This is carried out with the aim of coming up with results that help decision-makers in addressing the problems resulting from soil salinity with the least effort, the lowest cost, and the highest accuracy and realism.

المستخلص باللغة العربية
اعتمدت الدراسة عدد من أدلة ملوحة التربة عن طريق تطبيق تقنيات الجيوانفورماتيکس شمال شرق دلتا نهر النيل، مستندة على الانعکاسات الطيفية المختلفة لملوحة التربة. وتم التحقق الميداني عن طريق تجميع عينات من التربة وتحليلها کيميائياً، بغرض مقارنتها بنتائج الأدلة (8 مؤشرات)، مع الاعتماد على المراجعة الحقلية لالتقاط الصور المعبرة عن ملوحة التربة وأثارها على أکثر استخدامات الأرض حساسية لها وهو الغطاء النباتي، وذلک لتدعيم دقة التمييز الطيفي. وقد تبين أن کل مؤشر يعتمد على متغيرات مختلفة من الانعکاسات الطيفية، ومن ثم لجأت الدراسة إلى تحديد أفضل المؤشرات المناسبة والفعالة في تقييم الملوحة زمانياً ومکانياً شمال شرق دلتا النيل، وذلک عن طريق تحديد أعلى درجة ارتباط بين نتائج المؤشرات ونتائج التحليل الکيميائي لعينات التربة، کما اعتمدت الدراسة على أفضل المؤشرات في تحديد الغطاء النباتي وهوEVI  لمعرفة  درجة تأثر کثافة الغطاء النباتي بملوحة التربة، وذلک بهدف الخروج بنتائج تساعد صناع القرار  في معالجة المشاکل الناتجة عن ملوحة التربة بأقل جهد وأقل تکلفة وتکون أکثر دقة وواقعية.

الكلمات الرئيسية

الموضوعات الرئيسية

المراجع

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