Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userAnalytical Study of the Relationship Between Height and Diameter of Quercus Trees In The Goulan Heights
دراسة تحليلية للعلاقة بين قطر أشجار السنديان و ارتفاعها Spp Quercus في الجولان، سورية
1408
1 23
0
(
0
)
Authors
أحمد جيرودية( باحث )
Created by
Shamra Editor
Ask ChatGPT about the research
يهتم علم القياسات الحراجية Mensuration Forest بقياس القطر، و الارتفـاع و معامـل (معـدل) الشكل و المساحة القاعدية ... إلخ و حساب حجوم الأشجار و الاحتياطي الخشبي للمجموعـات الـشجرية، كذلك يدرس العلاقة الموجودة بينهما. استطاع علم القياسات الحراجية، بفضل تطبيقه أساليب الإحصاء و الرياضيات على الغابة أن يـستنتج قوانين مهمة جداً خلال نمو الغابة و تطورها. حيث استنتجت العلاقات الرياضية و المعادلات المناسبة، التي من خلالها يمكن تحديد قيمة مؤشر صعب القياس بواسطة مؤشر سهل القياس. لقد قمنا بدراسة مفصلة للعلاقة بين القطر و الارتفاع لأشجار السنديان .Spp Quercus المنتشرة في هضبة الجولان، و استنتجنا المعادلة التي نستطيع من خلالها حساب ارتفاع الأشجار بواسطة أقطارها، لأن قياس ارتفاع الأشجار يتطلب بالدرجة الأولى توافر أجهزة القياس المناسبة و معرفة استخدامها، كما أنـه يستغرق وقتاً طويلاً و جهداً كبيراً للتمكن من قياس ارتفاع الأشجار داخل الغابة مع وجود صعوبات كبيرة جداً في الغابات الكثيفة و الوعرة ..... إلخ .
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 and 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.
References used
Loumaf, F, M.; Ruhert, C. M. and Ycpensky, F. (1978). Variant statistic. Faronies Institute- Russia
Anouchien. N. P. (1982). Forest Mensuration. Moscow. 552. P
جيرودية، أحمد، 1999 - دراسة تحليلية للعلاقة بين القطر والارتفاع لأشجار السرو الدائم الاخضرار في محافظة ومدينة دمشق – مجلة باسل الأسد للعلوم الزراعية- العدد السابع.
rate research
Read More
This research aimed to determine the relationship between diameter and
size of Pinus trees available in 4 different regions in Swieda province. Breast
height diameter and height of tree were measured for more than 500 Pinus
Pinea trees. The relati
onship between diameter and size was studied, and a
model of diameter and size was developed as a polynomial model .
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 mea
suringthe
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).
This study aims to find the best indicators representing higher education
components using the method of multivariate statistical analysis represented in a manner
factor analysis, and create a mathematical model that connects the principal componen
ts
representing higher education and the rate of economic activity in Syria using multi- linear
regression analysis. A descriptive analytical approach is used in this study. The most
important results obtained state that the principal components that belong to higher studies
and intermediate institutes have a positive impact on the rate of economic activity of
manpower, whereas principal components that belong to students of state universities and
higher institutes have a negative impact on the rate of economic activity.
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.
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.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
