اثر خصائص التربة والمياه على ظاهرة التصحر في ناحية الزاب
الشريط الجانبي للمقالة
محتوى المقالة الرئيسي
الملخص
تعرف التربة بانها الطبقة الهشة والرقيقة التي تغطي معظم سطح اليابسة ، إذ يتراوح سمكها مابين بضع سنتمترات الى أمتار عدة وهي مزيج معقد من المواد المعدنية والعضوية والهواء والماء ([i]) تعد ترب منطقة الدراسة من الترب اللانطاقية . وهي تمثل الترب غير المتطورة لأسباب عدة منها التعرية او بالاضافة المستمرة اوبسبب طبيعة المواد المولدة ([ii]) على الرغم من وجود العديد من الخرائط لأصناف الترب في العراق الا انها كانت عمومية وشاملة لكافة انحاء العالم ولم تعطي وصفا مفصلا لأنواع الترب في منطقة الدراسة. اذ تم اعتماد تصنيف الفاو للترب في منطقة الدراسة اما المياه فلها دور مهم ايضاً في توسيع مظاهر التصحر ولاسيما المياه الجوفية التي تكون مالحة مما يؤدي الى تملح الأراضي الزراعية خاصة مع التذبذب في كميات الأمطار المتساقطة والأحوال المناخية
المقاييس
تفاصيل المقالة
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المراجع
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