Sokoine University of Agriculture

Diameter at breast height-crown width prediction models for Anogeissus Leiocarpus (DC.) Guill &Perr and Combretum Hartmannianum Schweinf

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dc.contributor.author Ibrahim, Elmugheira M.
dc.contributor.author Osman, Elmamoun H.
dc.date.accessioned 2017-02-27T09:27:19Z
dc.date.available 2017-02-27T09:27:19Z
dc.date.issued 2014
dc.identifier.issn 2325–4513
dc.identifier.uri http://www.suaire.sua.ac.tz/handle/123456789/1286
dc.description JOURNAL OF FOREST PRODUCTS & INDUSTRIES, 2014, 3(4), 191-197 ISSN:2325–4513(PRINT) ISSN 2325 - 453X (ONLINE) en_US
dc.description.abstract This study was carried out at El-Nour Natural Forest Reserve, Rosaries district, Blue Nile State with objective of predicting Crown width from Diameter at Breast Height for Anogeissus leiocarpus (DC.) Guill & Perr, and Combretum hartmannianum Schweinf species. Five models for predicting crown width were tested for these two species. For each species, dbh, total height and crown width were recorded. DataFit-9 statistical package of the Oakdale Engineering was used to fit the selected models. Akaike’s information criterion (AIC), adjusted coefficient of determination (Ra2), root mean squared error (RMSE), numerical and graphical analyses of the residuals were used for evaluating the models. The results of the study showed that, all fitted models were found to give satisfactory results with Ra2 range of 0.65 to 0.74 and RMSE of 1.12 to 1.40. The AIC values range from 114.8 for Combretum hartmannianum Schweinf and to 356.4 for Anogeissus leiocarpus (DC.) Guill & Perr. The study concluded that, the crown width could be estimated by the mean of diameter at breast height as it is easy to measure for ground-based inventory and stand structure determination. The crown width-diameter models examined in this study produced reasonably precise estimates for crown width and could be used to predict the crown width of the species under consideration. The study recommended that, Future research is needed with a greater variety of site and stand conditions in addition to a greater variety of tree sizes and ages. It should be noted that, the models used by this study were based on data collected from El-Nour Natural Forest Reserve in Blue Nile State; therefore, it should be used with caution outside this area. en_US
dc.language.iso en en_US
dc.publisher Research Publisher- Discovery that Matters en_US
dc.relation.ispartofseries JOURNAL OF FOREST PRODUCTS & INDUSTRIES,;2014, 3(4), 191-197
dc.subject Forest canopy en_US
dc.subject Tree crown en_US
dc.subject Crown width en_US
dc.subject Diameter-breast height en_US
dc.subject Non-linear regression en_US
dc.subject Models evaluation en_US
dc.title Diameter at breast height-crown width prediction models for Anogeissus Leiocarpus (DC.) Guill &Perr and Combretum Hartmannianum Schweinf en_US
dc.type Article en_US
dc.url http://researchpub.org/journal/jfpi/number/vol3-no4/vol3-no4-2.pdf en_US


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