Effect of stand density on the biomass productivity of populus nigra l. growing in Nineveh plantation

الملخص EN

Natural resource management faces significant challenges to increase the demand for natural products and limited production of these resource at the same time, poplar (PopulusnigraL.

( is one of the most natural resource with high production capacity, so it use to fill the demand for wood products.

Thus, fourdensities were selected for poplar stand, 5000 trees.

ha-1, 1666 trees.

ha-1, 834 trees.

ha-1 and 416 trees.

ha-1, also, three age stand 1, 2, 3 and four replicates, thus we have 48 experimental units, the area units 0.01 ha.

, we were take measurement of diameter at breast height, height trees, also, center of crown and width crown.

The volume, biomass produced for these stand and the different ages under study were calculated, it was found the biomass of the 5000 trees.

ha-1.

gave the highest volume and biomass production and for the different ages under study, the reference of statistical measure to that variation among densities.

It is clear to us that the production of biomass develops an increase with increase in the age of stand and increased the differences amongdensities, which are the most efficient high density and this is evident in the production produced in the third age and the various elements of the tree and the total production.

we find that the production capacity in continuous increase up to the age of the third and must be followed to reconstruct the next age of stand to deviation of production from the previous, then we recommend that selection thinning annually, until reach end cutting cycle of stand.