مراقبة تغير الجفاف الزراعي في حوض وادي المصلى جنوب محافظة تعز باستخدام الاستشعار عن بُعد
DOI:
https://doi.org/10.37375/sujh.v12i2.181الكلمات المفتاحية:
الجفاف الزراعي، المؤشرات الطيفية للنبات، وادي المصلى، محافظة تعز، الاستشعار عن بُعد.الملخص
يهدف البحث لمراقبة تغير الجفاف الزراعي في حوض وادي المصلى باستخدام تقنية الاستشعار عن بُعد، اعتمادًا على مرئيات القمر الصناعي الأمريكي لاندسات للأعوام (1990م – 2000م – 2019م) لاشتقاق وتصنيف مستويات الجفاف من خلال عدة مؤشرات منها: مؤشر الاختلاف الخضري الطبيعي، ومؤشر الحالة النباتية، ومؤشر الحالة الحرارية، ومؤشر تموين النبات بالماء، ومؤشر الحالة الصحية للنبات للاستدلال على الجفاف، والتغيرات التي طرأت على مناطق توزيعه في الحوض خلال المدة 1990م – 2019م.
وتوصلت نتائج البحث إلى أن عام 2019م كان أقل جفافًا، وعام 2000 أكثر جفافًا، ومما يؤكد ذلك بلغت نسبة مساحة المنطقة التي اتصفت بغطاء نباتي تراوح بين الفقير جدًا إلى الفقير 31% عام2019م، مقارنة بـــــ 41% عام 1990م، 50% عام 2000م، وبلغت مساحة المنطقة التي تعرضت لجفاف تراوح بين الشديد إلى الشديد جدًا 12.8% عام 2019م، مقارنة بــ 46.7% عام 1990م، ونحو 79.4% من إجمالي مساحة الحوض عام 2000
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