EFFECT OF WIDTH CROWN ON THE TAPER OF Populus nigra STEM IN ZAKHO REGION
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...
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| Format: | Article |
| Language: | Arabic |
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College of Agriculture
2008-09-01
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| Series: | Mesopotamia Journal of Agriculture |
| Online Access: | https://magrj.mosuljournals.com/article_26805_ca4539d28d9a27eb0c5a9dd985a486cf.pdf |
| Summary: | 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. |
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| ISSN: | 1815-316X 2224-9796 |