EFFECT OF WIDTH CROWN ON THE TAPER OF Populus nigra STEM IN ZAKHO REGION

• Main Author: Muzahim .S. younis
• Format: Article
• Language: Arabic
• Published: College of Agriculture 2008-09-01
• Series: Mesopotamia Journal of Agriculture
• Online Access: https://magrj.mosuljournals.com/article_26805_ca4539d28d9a27eb0c5a9dd985a486cf.pdf

Many mathematical function were used to estimate tapering degree of Populus nigra main stem tree in Zakho . 35 sample obtained thought stand classification and according to there density using strata randomized sampling method . Each sample area was 0.01 hectare .To record all changes that affect longitudinal and diametrical growth , one tree was chosen from each sample area , and all tree morphological dimension were recorded , in addition to distance between the trees . The chosen trees were felled and cuted into different parts at one meter length from ground level to 4 cm stem diameter . By using simple linear regression , four mathematical Models were established. In order to find the best fit model for these four Models , coefficient of determination, standard error of estimate were used and the following model give the best result d0 = b0+b1 cw (b2 (-b3hi) ) R2=0.87 S.E%=0.6369 By using above model , tapering tables was prepared for Populus nigra trees grown in Zakho at different stand density . By using this table a desired management decision can be chosen which can be suitable for the harvesting plan.