HEIGHT GROWTH MODELS FOR Populus nigra STANDS GROWN AT ZAKHO REGION

Yield of stand affected by different characteristics of a tree or the stand , correspondingly ,the height is one of the important factor effects the quality and quantity of the yield , for that this investigation was conducted in order to estimate growth of height for Populus nigra stands grown at...

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Main Author: Muzaham Saeed
Format: Article
Language:Arabic
Published: College of Agriculture 2008-06-01
Series:Mesopotamia Journal of Agriculture
Online Access:https://magrj.mosuljournals.com/article_27825_8965c2919bdfc01f03cb0ecba07c52a1.pdf
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spelling doaj-1a587a4a5ac04d41b405a3bcdc2b2cb42020-11-25T03:23:46ZaraCollege of AgricultureMesopotamia Journal of Agriculture1815-316X2224-97962008-06-0136212713510.33899/magrj.2008.2782527825HEIGHT GROWTH MODELS FOR Populus nigra STANDS GROWN AT ZAKHO REGIONMuzaham SaeedYield of stand affected by different characteristics of a tree or the stand , correspondingly ,the height is one of the important factor effects the quality and quantity of the yield , for that this investigation was conducted in order to estimate growth of height for Populus nigra stands grown at Zakho Region depending on age ( A) , diameter at breast height (dbh) and density of stand . Forty five samples will be selected randomly from stands with different densities and ages . Data analyzed and mathematical models driven for many equations connect the studied variable of stands with the height by using regression system then constructing on the resulted precision measurements of the equation , the followings were selected: H =-12.12 + 8.50(A) 0.5 H = -2.08 + 1.74(A) + 0.14(SP ) 2 H = 1.27 + 2.132(D) – 0.75EXP(SP) The coefficient determination coefficient (R2) of above equations were (90.3, 91.02 ,91.33) with standard error (0.88,0.86,0.84) respectively. Resulted equations enable us to estimate average stand height at any age or density then different tables and graphics prepared to illustrate the development of stand height growth which is widely used by forest managers in order to predict the mean stand height also to estimate average growth annual growth in the height of stand through first driven of equations links the height with the age .https://magrj.mosuljournals.com/article_27825_8965c2919bdfc01f03cb0ecba07c52a1.pdf
collection DOAJ
language Arabic
format Article
sources DOAJ
author Muzaham Saeed
spellingShingle Muzaham Saeed
HEIGHT GROWTH MODELS FOR Populus nigra STANDS GROWN AT ZAKHO REGION
Mesopotamia Journal of Agriculture
author_facet Muzaham Saeed
author_sort Muzaham Saeed
title HEIGHT GROWTH MODELS FOR Populus nigra STANDS GROWN AT ZAKHO REGION
title_short HEIGHT GROWTH MODELS FOR Populus nigra STANDS GROWN AT ZAKHO REGION
title_full HEIGHT GROWTH MODELS FOR Populus nigra STANDS GROWN AT ZAKHO REGION
title_fullStr HEIGHT GROWTH MODELS FOR Populus nigra STANDS GROWN AT ZAKHO REGION
title_full_unstemmed HEIGHT GROWTH MODELS FOR Populus nigra STANDS GROWN AT ZAKHO REGION
title_sort height growth models for populus nigra stands grown at zakho region
publisher College of Agriculture
series Mesopotamia Journal of Agriculture
issn 1815-316X
2224-9796
publishDate 2008-06-01
description Yield of stand affected by different characteristics of a tree or the stand , correspondingly ,the height is one of the important factor effects the quality and quantity of the yield , for that this investigation was conducted in order to estimate growth of height for Populus nigra stands grown at Zakho Region depending on age ( A) , diameter at breast height (dbh) and density of stand . Forty five samples will be selected randomly from stands with different densities and ages . Data analyzed and mathematical models driven for many equations connect the studied variable of stands with the height by using regression system then constructing on the resulted precision measurements of the equation , the followings were selected: H =-12.12 + 8.50(A) 0.5 H = -2.08 + 1.74(A) + 0.14(SP ) 2 H = 1.27 + 2.132(D) – 0.75EXP(SP) The coefficient determination coefficient (R2) of above equations were (90.3, 91.02 ,91.33) with standard error (0.88,0.86,0.84) respectively. Resulted equations enable us to estimate average stand height at any age or density then different tables and graphics prepared to illustrate the development of stand height growth which is widely used by forest managers in order to predict the mean stand height also to estimate average growth annual growth in the height of stand through first driven of equations links the height with the age .
url https://magrj.mosuljournals.com/article_27825_8965c2919bdfc01f03cb0ecba07c52a1.pdf
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