الخصائص التشريحية و الكيميائية لخشب الشد (Tensions Wood)‎ في أشجار البلوط العادي

العناوين الأخرى

Anatomical, chemical and physical properties of Quercus aegilops L. Tension Wood trees

المؤلفون المشاركون

شاهين عباس مصطفى
إبراهيم، صباح يوسف أحمد
الملاح، عبد الرزاق رؤوف سليمان

المصدر

مجلة جامعة كركوك للعلوم الزراعية

الناشر

جامعة كركوك كلية الزراعة

تاريخ النشر

2019-12-31

دولة النشر

العراق

عدد الصفحات

9

التخصصات الرئيسية

العلوم الزراعية

الملخص الإنجليزي

This study was conduct to show the effect of tension wood on Some anatomical characteristics and wood chemical components of oak trees ( Quercus aegilops L.

).

Some technological properties between leaning and vertical tree stems and between stem hight levels was studied.

The results showed that the highest significant values for average fiber length, and lumen diameter were in the standing trees stems compared with the leaning trees stems.

However, there were large increase in fiber cel wall thickness and rankle ratio of leaning tree stem.

It was found that there were increase in values of most anatomical characteristics from stem base to stem top.

The lowest values were in stem base, followed by gradualwith increasing stem height level until it reached the maximum values at the middle level of stem height, then these values were decreased slightly at the top of stem level, except the wall thickness and lumen diameter value which increased gradually by increasing stem height to the top stem level.

It was found that the highest mean values of most anatomical characteristics were in opposite wood‚ but there were slight increase in fiber cell wall thickness and rankle ratio in tension wood compared with opposite wood.Also, there were increase in anatomical characteristic values of sapwood compared to heartwood except fiber cell length and rankle ratio.

This indicate that most of the anatomical characteristics will increase by increasing the distance from pith to bark, since heartwood have the lower value in most anatomical characteristics compared with sapwood values which is closer to bark.

This result may be due to the effect of tree age.

The highest means for chemical comppound percent soluble in ethanol-benzene ‚ hot water, and lignin, were in the standing trees compared to leaning ones, except holocellulose and ash percent which showed the highest mean in leaning trees.The result showed that there were increase in soluble chemical comppound percent from stem base to stem top.

Lignin percent showed slight increase in the middle height then it decrease slightly at the top height level,.

Holocellulose percent showed a reverse results compared to lignin percent, this results indicated that the eccentric pith was highest at the stem base and decreased gradually to become more centric at stem top.

The result showed that the highest mean values for most of chemical component were in the tension wood except lignin ratio and chemical comppound soluble in hot water percent which have the lower value in tension wood .Also, the effect of wood location showed that the highest chemical percent values were in heartwood, except holocellulose and ash percent which have the lowest value.

نوع البيانات

أوراق مؤتمرات

رقم السجل

BIM-1249953

• APA
• MLA
• AMA