دراسة تأثير الظروف المناخية في النمو الشعاعي للصنوبر البروتي Pinus brutia.Ten في غابة كفرفو– طرطوس
Abstract
تستخدم طرق التأريخ الشجري (Dendrochronology) لدراسة استجابة حلقات نمو الأشجار للظروف المحيطة, حيث أن سماكة حلقات النمو تتأثر بقوة بالظروف البيئية و خاصة المناخية منها. و بهدف دراسة حلقات النمو للصنوبر البروتي في غابة كفرفو- طرطوس/سورية, تم انتقاء اثنتي عشر شجرة سائدة (Dominant Tree) من الصنوبر البروتي المشجر, استخدم مسبر بريسلر للحصول على عينتين متعامدتين على مستوى ارتفاع الصدر من كل شجرة. بعد معاملة العينات أجريت عملية التأريخ البيني ( Cross-Dating), و تم قياس سماكة حلقات النمو بدقة 0.01 ملم. في النتيجة حصلنا على سلسلة تتألف من 31 حلقة, تغطي الفترة من (1983-2013). تميزت حلقات النمو للمواسم 1999-1998, 2007-2008 ,2009-2010 بضيقها, و حلقات النمو للمواسم 1985-1986, 1991-1992, 2002-2003 بسماكتها, بينما شهدت المواسم 1996-1997, 1994-1995, 1986-1987 تشكل حلقات كاذبة. و تبين أن انخفاض الهطل المترافق مع ارتفاع لدرجة الحرارة خلال فترات النمو يشجع تشكل حلقة ضيقة. في حين أن ازدياد كمية الهطل في الشتاء المترافق مع انخفاض درجة الحرارة يشجع ازدياد عرض حلقات النمو. Dendrochronology methods are used to study the response of tree rings to environmental factors, where tree rings width are strongly influenced by environmental factors especially climatic ones. In order to study tree rings of brutia pine in Kfarfo forest – Tartus, 12 dominant trees were selected, using increment drill two perpendicular core samples at breast height from each tree were extracted. After treatment, the core samples were cross dated. Tree-rings widths were measured to the nearest 0.01 mm. Consequently, a series of 31 tree rings covering the period 1983-2013 was obtained. Results showed that, tree rings of the years: 1998-1999, 2007-2008 and 2009-2010 were clearly narrow; while rings of the years: 1985-1986, 1991-1992, and 2002-2003 were obviously wide. Whereas, rings of the years: 1986-1987, 1994-1995, 1996 and 1997 were absent. Finally, results reveal that, as precipitation decreased corresponding with temperature increase in the growing season; narrow rings were recorded. While, increasing winter precipitation corresponding with temperature decrease leaded to increase in ring width.Downloads
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