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Register a new userAn analytical study of the relationship between diameter and size of Pinus Pinea trees In Swieda province, Syria
دراسة تحليلية للعلاقة بين القطر و الحجم لأشجار الصنوبر الثمري Pinuspinea في محافظة السويداء
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أجري البحث بهدف تحديد العلاقة بين قطر الأشجار الصنوبر المزروعة فـي منـاطق مختلفـة مـن محافظة السويداء و حجمها، قيست الأقطار على ارتفاع الصدر و الارتفاع لأكثر من 500 شجرة موزعة في أربع مناطق تشجير مختلفة للصنوبر الثمري في محافظة السويداء، و حسب حجم كـل شـجرة مدروسـة، و من ثم درِست العلاقة بين أقطار الأشجار على ارتفاع الصدر و حجومها باستعمال معادلة قطع مكافئ من الدرجة الثانية.
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 relationship between diameter and size was studied, and a model of diameter and size was developed as a polynomial model .
References used
ACSAD. 1980. Proceeding of Tour guide, soil classification workshop. 2-4 April, ACSAD\SS\R28 Damascus. 170 P
Gilman, E. F. and D. G. Watson. 1994. Pinus pinea Stone. Fact Sheet ST-472, a series of the Environmental Horticulture Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida
John, H. and M. Thornley. 1999. Modelling stem height and diameter growth in Plants . Annals of Botany 84: 195-205
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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 aimed to evaluate the growth and productivity of planted Pinus pinea
in pure stands at "DAHR AL SORANI" forest site. The site is about 50 km north east of
Tartous city, which is located in Temperate-Humid Bioclimate Zone.
Results sho
wed that the stands were not equivalent in growth indicators; this was due
to many factors affecting growth like site characteristics and trees density…etc. In spite of
the mediocre values of form factor, the volume and mean of annual increment was not
influenced.
Results revealed that the mean values of tree density was 851 trees/ha and ranged
between 350 - 1975 trees/ha, woody volume was averaged at 116.337 m3/ha and
ranged between 51.6519 - 215.3635 m3/ha; annual increment had also an average of 4.4548
m3/ha/year and ranged between 1.9866 - 7.9764 m3/ha/year.
The study showed a high straightness of pine. Pinus pinea trees had very rarely
forked boles.
The site was planted between 1960-1962 year with area size of 33 ha. The plots were
systematically sampled with area size of 400 m2. The distance between plots was 100 m.
Results showed that: trees number per hectare (N), stand average diameter (db
h) and
height (H), basal area (G), productivity (V) and average annual growth (A.A.G) were: 237
tree/ha, 34.68 cm, 12 m, 21.91 m2/ha, 137.51 m3/ha and 2.64 m3/ha/year ; respectively.
Stand height curve was developed with coefficient of determination of R2=0.50.
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
oor with a mild winter
as the average of rainfall thermal coefficient reached (Q2 = 72.01). The study showed that
the low productivity of cones (20 kg con / tree) was one of the limiting factors of natural
regeneration. The trees high density (462 tree / ha), led to a decrease in tree diameter at
breast level (30 cm) and low coronary size (320.2 m3).
Seed germination was not affected by illumination periods, while salinity levels led
to a significant decrease in germination from 90% at control to 19% at 0.5 mol / l.
All of one year old sapling or seedling were dead during summer months, while more
than 90% of two years old cultivated sapling, survived in all treatments, but no significant
differences among them.
This study was carried out at three different forest sites in Syria in order to
determine the effect of changing rainfall, temperature and soil on kernel
productivity of stone pine (Pinus pinea L.)> these sites included: Jabal Alnabi
Mata, (Tartou
s province, L1), Dahr Alkhoser (Homs province, L2) and E′en
Jron site (Idleb province, L3). Results showed that kernel productivity of stone
pine per tree was 236.3, 252.8, 143 g per tree, and 177, 162.3, and 86.98 kg per
hectare in L1, L2, and L3, respectively. These differences were attributed due
to the variation in the composition, textured and fertility of the soil available in
the three locations studied. It was concluded that trees of stone pine grow better
and superior in Kernel productivity in humid and super-humid bioclimatic
zone.
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