SOIL SOLARIZATION AND THE COMPOSITION OF SOIL FUNGAL COMMUNITY IN UPPER EGYPT التشميس ومکونات المجتمع الفطرى فى تربة بصعيد مصر

Document Type : Original Article

Abstract

ABSTRACT :




                In Upper Egypt, 6 weeks solarization of soil resulted in elevating soil temperature to ranges considered to be lethal or sublethal to many soil fungi.
                The composition of soil fungal community was altered in solarized soil. Both total count and number of fungal species detected on PDA medium at 28 ± 2oC were greatly reduced in solarized soil as compared to unmulched soil. On the other hand, number of fungal genera was not significantly affected by soil solarization throughout the sampling period (0 – 13 months). At the end of solarization period, several fungi re-colonized solarized soil and the total count of soil fungi was significantly higher than that of unmulched soil. Counts of thermophilic/ thermotolerant fungi isolated on YpSs were significantly reduced at the end of solarization period (40 days). Number of thermophilic/thermotolerant genera and species was not significantly affected by soil solarization.
أدى تشميس التربة لمدة 6 أسابيع فى صعيد مصر إلى ارفع درجة حرارة التربة إلى معدلات تعتبر  قاتلة أو مثبطة لمعظم فطريات التربة، وکان نتيجة لذلک أن تغير ترکيب المجتمع الفطرى تغيراً ملحوظاً. وکان هذا التغير واضحاً فى التعداد الکلى للفطريات، وکذلک فى عدد الأنواع الفطرية المعزولة على بيئة PDA  والتحضين عند 28°+2 °م، وعلى النقيض فإن عدد الأجناس الفطرية المعزولة على نفس البيئة لم تتأثر تأثراً معنوياً بعملية التشميس خلال الفترة 0-13 شهراً.
کما زاد التعداد الکلى للفطريات زيادة معنوية بعد انتهاء فترة التشميس، وأصبح التعداد الکلى للفطريات فى التربة المشمسة أعلى منه فى التربة غير المشمسة أو المظللة، وذلک بعد 3 شهور من انتهاء فترة التشميس.
کما أدى تشميس التربة إلى اختزال التعداد الکلى للفطريات المحبة أو المقاومة للحرارة والمعزولة على الوسط الغذائى  YpSs ، وذلک بعد 40 يوماً من التشميس، کما لم يتأثر تعداد الأجناس والأنواع الفطرية تأثراً معنوياً بعملية التشميس. 

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