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Register a new userCalibration of some (height-diameter) Equations for QuercuscalliprinosWebb.MaquisGrown on the Eastern Versants of the Syrian Coastal Mountains
معايرة بعض معادلات (القطر-الارتفاع) في ماكي السنديان العادي Quercus calliprinosWebb. على السفوح الشرقية للجبال الساحلية في سورية
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يهدف هذا البحث إلى اختبار بعض المعادلات الرياضية، المستخدمة في مناطق مختلفة و على أنواع حراجية متنوعة، في تقدير الارتفاع الكلّي لأفرع (أخلاف) السنديان العادي Quercuscalliprinos Webb. اعتماداً على قطر هذه الأفرع، ما يسمح بتقدير حجومها دون قياس الارتفاع و يوفر بالتالي الكثير من الجهد و الوقت و المال من قبل الحراجيين. شملت الدراسة 102 عينة متوزعة على أهم الكتل الحراجية على السفح الشرقي للجبال الساحلية في سورية و متنوعة من حيث كثافة الأفرع التي تنمو على الأرومات و خصوبة الموقع و العمر. تم اختيار العينة على شكل مستطيل يحتوي على 50 أرومة من السنديان على الأقل بغض النظر عن مساحتها.
This research aims to test some equations, used in different regions and forest types, for assessing the total height of shoots in the oak )Quercuscalliprinos) Maquis forests, depending on diameter,which enable the estimation of volumes without measuringthe height of these shoots. This is very important to saveefforts, time and moneyinvested by foresters. The study included102 samples distributed within the most important oak forests on the eastern exposition of the coastal mountains. The plots have rectangular shape with 50 shoots at least. The plots vary in shoot density, soil fertility and Maquiage. In each sample we measured the diameter at a height of 30 cm, the total height of (10-20) shoots of various diameters (low-medium-dominant).
References used
CALAMA, R., MONTERO G. Interregional nonlinear height–diameter model with random coefficients for stone pine in Spain. Can. J. For. Res. 34, 2004, 150–163
CURTIS, R.O. Height–diameter and height–diameter–age equations for second growth Douglas-fir. For. Sci. 13, 1967, 365–375
FULTON, M.R. Patterns in height–diameter relationship for selected treespecies and sites in eastern Texas. Can. J. For. Res. 29, 1999, 1445–1448
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This research aims to studying the plant species diversity in the
oak Maquis at the Eastern versants of the coastal mountains in
Syria, and tries to identify the most important factors affecting this
diversity.
This study aims to construct a mathematical model to calculate the form factor of
Palestine Oak Maquis grown on the eastern versants of coastal mountains. The form factor
model can help foresters to precisely estimate the volume of tree and forest
stands.
In the year 2014, 129 oak shoots of various ages and sizes, located in natural stands
of different densities and site qualities covering all conditions of region grown on, were
felled.
Diameters at different heights of the felled shoots were measured; shoots volumes
and volumes of equivalent cylinders were calculated, and consequently the values of shoot
form factor were computed. The dataset was randomly split into two parts, 70% (90
shoots) of the data for constructing form factor model and 30% (39 trees) for model
validation.
Several form factor models were developed using the non-linear regression equations
in the statistical program SPSS. Best fit to the data was selected and value of the
coefficient of determination adjusted (R²adj) was about 0.77. The model has been validated
using several statistical methods, the relative bias of the best model ( e%) was ca. -3.6 %,
while the value of model accuracy ) % x m ) was 15%. In order to obtain lower value of
model relative bias and higher value of accuracy, it’s recommended to use a larger
database comprising all distribution areas of oak Maquis in Syria.
Diameter, height and the trank shape indicators are generally important
parameters in forestry measurements.
The importance of these parameters is considered in cases such as the
determination of tree volume and the wood reserve of stand forest an
d the
relationship between the two parameters is also evaluated.
Forest Mensuration through the application of statistical and mathematical
procedures on the forest, developed very important mathematical formulae and
equations in the growth and development of the forest, through which
detrmination of a hard measuring parameter (indicator) can be achieved by an
easy measured one.
Our study emphasized on the relationship between height and diameter of
Quercus trees in the Goulan heights. We developed an equation through which
the height of trees can be calculated by their diameter. This is very important if
we considered that measuring the hieght of trees requires suitable measuring
equipments and experience, in addition to the long time required for measuring
the height of trees inside (within) the forest.
This research was carried out in five sites varied in altitude representing Mediterranean vegetation zones of western slopes of Lattakia Mountains during 2010 - 2011 on Quercus infectoria Oliv species. Research shows that significant difference of al
titude above sea level has obvious effect on seed germination in different sites. This is noticed in characteristics related to fruit weight, germination rate value sum, and height of vegetal and rooty seedling after four months of germination. Altitude above sea level has no effect on the branchlet number of rooty and vegetal sum height of seedlings as well as mean of leaves number of seedlings. According to germination ratio and daily germination ratio, in addition to seedling diameter, there is harmony among all sites. It can be deduced that there are changes in growth traits of studied seedlings in different sites. This is the primary indication of the impact of the altitude above sea level on seedling traits of Quercus infectoria Oliv.
This research was aimed at evaluation of growth and productivity of two
pine species; namely, Maritime Pine Pinus pinaster Sol. and Brutia Pine P.
brutia Ten. at the Cool-Humid Bioclimate Zone in the Mid Altitudes of the
Coastal Mountain Ranges. T
he study revealed that, height growth was not
significant between the two species. Although average diameter at breast
height was significantly superior in Brutia pine to that of Maritime pine, this
was not reflected on productivity of trees, wood volume, or the annual growth
rate due to great differences in growth forms of the two species.
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