هدفت هذه الدراسة إلى تقدير ارتفاع أشجار الصنوبر البروتي P.brutia في موقع تحريج كفردبيل في ريف جبلة انطلاقاً من أقطارها و ذلك عبر معايرة ثمانية موديلات رياضية عالمية (Michailoff, Prodan, Petterson, Parabel, Korsun, Logarithmic, Freese, Chapman-Richards ).
تم في العام 2015 تحديد 15 عينة حراجية موزعة على كامل الموقع بحيث تغطي التباين في الارتفاع عن سطح البحر، المعرض، الانحدار، الكثافة. ثم تم قياس قطر 330 شجرة على ارتفاع الصدر (dbh)، قيس ارتفاع 165 منها. استُخدامت 116 شجرة من بين الأشجار الـ 165 المُقاسة (70% منها) لمعايرة ثوابت الموديلات، في حين استُخدمت بقية الأشجار 49 شجرة (30%) لإجراء عدد من الاختبارات الإحصائية لجودة تلك الموديلات.
بينت النتائج أن أعلى قيمة لمعامل التحديد (Coefficient of Determination (R2= 0.53 و أدنى قيمة للنسبة المئوية لدقة الموديل (mx %) (17.665%) كانت في الموديل Parabel و ذلك يعني أنه الموديل الأفضل لحساب الارتفاع باستخدام القطر على ارتفاع الصدر نظراً لتفوقه في معظم اختبارات الجودة. يمكن لهذا الموديل أن يوفر الكثير من الجهد و الوقت على الحراجيين عند وضع خطط التنظيم و الإدارة للموقع المدروس.
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.
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
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 a
This study aimed to estimate the level of air pollution in some portable heavy metals
in dust quarries by needles of Pinus brutia Ten. as biomonitor In site of Kfardabeel Stand-
Jableh. The samples of dust and leaves were collected at the end of Ju
Estimation of tree and stand volume is a key calculation for productive forest
management (de Miguel et al., 2012). A precise estimation of tree volume needs to take the
variation in bole forms into account while calculation, this can be done by es
Pinus brutia cover 67.87% of AlFronloq protected area, this forest provide habitat
for wildlife especially forest birds. The aim of this study is to define bird species that use
Pinus brutia forest and their relation to vegetation characteristics.W
The study was achieved in 2014-2015 at Dahr Khribat stone pine forest, Latakia. to
determine the factors affecting the natural regeneration of the stand. The results of climate
studies indicated that the region is located in the semi-wet climate fl