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Studying the Influence of Competition on the Growth of Brutia Pine Pinus brutia Ten. Trees in Kafardabeel Stand – Jableh - Syria

دراسة تأثير المنافسة على نمو أشجار الصنوبر البروتي Pinus brutia Ten في موقع تحريج كفردبيل - جبلة - سورية

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 Publication date 2017
and research's language is العربية
 Created by Shamra Editor




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This research aimed to investigate the competitive situation and the growth reduction as a result of competition for brutia pine trees grown in Kafardabeel stand – Jableh. In the year 2015, 15 circle plots (with area size of 400 m²) in the study area planted in 1974 were sampled; all variations in the site like tree density, aspect, slop, topography and site fertility were covered. In the sample plot diameter at breast height of all trees and also coordinates of central tree and coordinates of all compotators as well as were measured. In order to study the competitive situation, two different types of competition indices: position dependent (Heygi1, Heygi2, BAL) and position independent (CCF) indices were used.


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Research summary
تهدف هذه الدراسة إلى تحليل تأثير الكثافة الشجرية على نمو أشجار الصنوبر البروتي في موقع تحريج كفردبيل بمنطقة جبلة في سوريا. تم أخذ 15 عينة دائرية بمساحة 400 متر مربع لكل عينة في عام 2015، حيث تم تغطية التباين الإحصائي في الموقع من حيث الكثافة الشجرية، المعرض، الانحدار، الطبوغرافيا، وخصوبة الموقع. تم قياس أقطار جميع الأشجار على ارتفاع الصدر، بالإضافة إلى إحداثيات الشجرة المركزية وجميع الأشجار المنافسة لها. استخدمت الدراسة نوعين من مؤشرات المنافسة: مؤشرات مرتبطة بموضع الشجرة (Heygi1, Heygi2, BAL) وأخرى غير مرتبطة بموضع الشجرة (CCF). أظهرت النتائج أن زيادة عدد الأشجار في الهكتار تزيد من قيم مؤشرات المنافسة، مما يؤدي إلى تناقص أقطار الأشجار ومساحتها القاعدية. توصي الدراسة باستخدام مؤشرات المنافسة المرتبطة بموضع الشجرة لتوصيف الحالة التنافسية في المواقع الحراجية المشابهة.
Critical review
تقدم الدراسة تحليلاً شاملاً ومفصلاً لتأثير الكثافة الشجرية على نمو أشجار الصنوبر البروتي باستخدام مؤشرات المنافسة المختلفة. ومع ذلك، يمكن تحسين الدراسة من خلال تضمين تحليل أعمق للعوامل البيئية الأخرى التي قد تؤثر على النمو، مثل التربة والمناخ. بالإضافة إلى ذلك، يمكن أن تكون الدراسة أكثر شمولية إذا تم تضمين مواقع أخرى للمقارنة. كما أن استخدام تقنيات حديثة مثل الاستشعار عن بعد يمكن أن يضيف قيمة إضافية للبحث.
Questions related to the research
  1. ما هي الأهداف الرئيسية لهذه الدراسة؟

    تهدف الدراسة إلى تحليل تأثير الكثافة الشجرية على نمو أشجار الصنوبر البروتي في موقع تحريج كفردبيل بمنطقة جبلة في سوريا، وتوصيف الحالة التنافسية للأشجار باستخدام مؤشرات المنافسة المختلفة.

  2. ما هي المؤشرات المستخدمة في الدراسة لتقييم المنافسة بين الأشجار؟

    استخدمت الدراسة نوعين من مؤشرات المنافسة: مؤشرات مرتبطة بموضع الشجرة (Heygi1, Heygi2, BAL) وأخرى غير مرتبطة بموضع الشجرة (CCF).

  3. ما هي النتائج الرئيسية التي توصلت إليها الدراسة؟

    أظهرت النتائج أن زيادة عدد الأشجار في الهكتار تزيد من قيم مؤشرات المنافسة، مما يؤدي إلى تناقص أقطار الأشجار ومساحتها القاعدية. توصي الدراسة باستخدام مؤشرات المنافسة المرتبطة بموضع الشجرة لتوصيف الحالة التنافسية في المواقع الحراجية المشابهة.

  4. ما هي التوصيات التي قدمتها الدراسة بناءً على النتائج؟

    توصي الدراسة باستخدام مؤشرات المنافسة المرتبطة بموضع الشجرة لتوصيف الحالة التنافسية في المواقع الحراجية المشابهة، والقيام بعمليات تقليم بشدات مختلفة تبعاً للكثافة بهدف التخفيف من عمليات المنافسة وتحسين نمو الأشجار المتبقية.


References used
BIGING, G. S., DOBBERTIN, M,. 1995. Evaluation of competition indices in individual tree growth models. Forest Science 41(2), 360-377
BOYDAK, M. 2004. Silvicultural characteristics and natural regeneration of Pinus brutia Ten. – a review. Plant Ecology, No. 171, , 153–163
CANHAM, C. D. LEPAGE, P. T. and COATES, K. D. 2004. A neighbourhood analysis of canopy tree competition: effects of shading versus crowding. Can. J. For. Res. 34: 778–787
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