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Calibration Of some Mathematical Models To Estimate Tree Height Of Pinus brutia Ten. In Site Of Kfardabeel Stand- Jableh

معايرة بعض الموديلات الرياضية لتقدير ارتفاع أشجار الصنوبر البروتي Pinus brutia Ten. في موقع تحريج كفردبيل- جبلة

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 Publication date 2016
and research's language is العربية
 Created by Shamra Editor




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This study aimed to estimate the height of the Pinus brutia trees in Kafardabeel forested area- Jableh. Eight mathematical forms (Michailoff, Prodan, Petterson, Parabel, Korsun, Logarithmic, Freese, Chapman-Richards) were used. In 2015, the diameter of 330 trees at breast height (dbh) were measured, and only heights of 165 of them were taken. Measurements were carried out in 15 sample plots all over the study area to cover site variations in altitude, exhibition, gradient and density. Data were split into two parts: 116 tree (70%) were used for model constrction, while the remaining trees 49 tree (30%) were used for model validation. The Results showed that, Parabel had the highest value for the Coefficient of Determination (R²=0.53) and the lowest value of the relative accuracy (mx%) (17.665%). That means it was the the best model to calculate tree height using diameter at breast height. This model can help foresters in forest management planning for study area and similar sites.


Artificial intelligence review:
Research summary
هدفت هذه الدراسة إلى تقدير ارتفاع أشجار الصنوير البروتي (Pinus brutia) في موقع تحريج كفردبيل في ريف جبلة باستخدام ثمانية موديلات رياضية عالمية (Michailoff, Prodan, Petterson, Parabel, Korsun, Logarithmic, Freese, Chapman-Richards). تم قياس أقطار 330 شجرة على ارتفاع الصدر (dbh) وارتفاع 165 منها. استخدمت 116 شجرة لمعايرة ثوابت الموديلات، بينما استخدمت 49 شجرة لاختبار جودة الموديلات. أظهرت النتائج أن موديل Parabel كان الأفضل، حيث حقق أعلى قيمة لمعامل التحديد (0.53) وأدنى قيمة للنسبة المئوية لدقة الموديل (17.665%). يمكن لهذا الموديل أن يوفر الكثير من الجهد والوقت على الحراجيين عند وضع خطط الإدارة للموقع المدروس. توصي الدراسة باستخدام النمذجة الرياضية على كافة التشكيلات الحراجية في سوريا لتقييمها ووضع خطط الإدارة المناسبة لها.
Critical review
دراسة نقدية: على الرغم من أن الدراسة قدمت نتائج مهمة حول استخدام الموديلات الرياضية لتقدير ارتفاع أشجار الصنوير البروتي، إلا أن هناك بعض النقاط التي يمكن تحسينها. أولاً، كان من الممكن توسيع نطاق الدراسة ليشمل مواقع أخرى ذات ظروف بيئية مختلفة للتحقق من عمومية النتائج. ثانياً، لم يتم التطرق بشكل كافٍ إلى تأثير العوامل البيئية الأخرى مثل التربة والمناخ على دقة الموديلات. ثالثاً، كان من الممكن استخدام تقنيات حديثة مثل الذكاء الاصطناعي لتحسين دقة التقديرات. وأخيراً، كان من الأفضل تضمين تحليل اقتصادي لتقدير الفوائد المالية لاستخدام هذه الموديلات في إدارة الغابات.
Questions related to the research
  1. ما هو الهدف الرئيسي من الدراسة؟

    الهدف الرئيسي من الدراسة هو تقدير ارتفاع أشجار الصنوير البروتي في موقع تحريج كفردبيل باستخدام موديلات رياضية عالمية.

  2. ما هي الموديلات الرياضية التي تم استخدامها في الدراسة؟

    تم استخدام ثمانية موديلات رياضية وهي: Michailoff, Prodan, Petterson, Parabel, Korsun, Logarithmic, Freese, Chapman-Richards.

  3. ما هو الموديل الذي أثبت كفاءته الأعلى في تقدير ارتفاع الأشجار؟

    موديل Parabel أثبت كفاءته الأعلى حيث حقق أعلى قيمة لمعامل التحديد وأدنى قيمة للنسبة المئوية لدقة الموديل.

  4. ما هي التوصيات النهائية للدراسة؟

    توصي الدراسة باستخدام موديل Parabel لتقدير ارتفاع أشجار الصنوير البروتي في مواقع مشابهة، وتوسيع استخدام النمذجة الرياضية على كافة التشكيلات الحراجية في سوريا لتقييمها ووضع خطط الإدارة المناسبة لها.


References used
ALI, W. Modelling of Biomass production Potentional of Poplar in short Rotation Plantions on Agriculture Lands of Saxony, Germany, Doctoral thesis, TU Dresden, Tharandt, Institute of Forest Growth and Forest Computer Sciences. 2009, 130 P
HUANG, S., TITUS, S. J., WIENS, D. P. Comparison of nonlinear heightdiameter functions for major Alberta tree species. Can J For Res, 1992, 22:1297–1304
OBEYED, M. H. Predictive models between diameter, height, crown diameter and age of Pinus brutia ten.in Zawita and Atrush Districts. G .J. B. B., 2014, VOL.3 (2) :203- 210
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