تباين عرض حلقات النمو و تأثيرها في الوزن النوعي لأشجار الصنوبر البروتي Pinus brutia ten و السرو العمودي cupressus sempervirens var. pyramidalis tozz. النامية في مشجر نينوي

Abstract EN

Four trees growing in Ninavah plantation were chosen, two of them are Pinus brutiaTen.and the others are Cupressus sempervirens var.

pyramidalis Tozz..

The trees were filled, from each tree six sample discs of (25 mm) thick were taken, three of them directly above (1.3m) and the others below, then each disc were radially sawn in the four directions of the radius, the test specimens were cut from these with the dimensions of (25 × 25 × 25 mm) used for measuring annual ring width and wood specific gravity.

A significant difference in ring width and wood specific gravity was observed along the radial axis from pith to bark, the value of ring width decreases while wood specific gravity increase, and significant negative relationships had been found between ring width and wood specific gravity in both pine and cypress.

There were significant difference between the trees.

The mean value of ring width was (3.951mm) for pine while it was (3.141mm) for cypress, and the mean wood specific gravity of pine was (0.556) while it was (0.505) for cypress.