Site Specific Stem Volume Models for Pinus patula and Pinus oocarpa
Sustainable management of timber forests requires availability and adequacy of models for accurate estimation of tree volumes. This study was conducted to develop site specific models for estimating individual total tree stem volume of Pinus patula and Pinus oocarpa at Chongoni Timber Plantation in...
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | International Journal of Forestry Research |
| Online Access: | http://dx.doi.org/10.1155/2017/3981647 |
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| author | Herbert Malata Elisha S. Ngulube Edward Missanjo |
| author_facet | Herbert Malata Elisha S. Ngulube Edward Missanjo |
| author_sort | Herbert Malata |
| collection | DOAJ |
| description | Sustainable management of timber forests requires availability and adequacy of models for accurate estimation of tree volumes. This study was conducted to develop site specific models for estimating individual total tree stem volume of Pinus patula and Pinus oocarpa at Chongoni Timber Plantation in Central Malawi. A total of 32 trees from Pinus patula compartment and 48 trees from Pinus oocarpa compartment were destructively sampled. Various predictors including diameter at breast height (dbh) and height (ht) were run against total stem volume using a nonlinear mixed-effects modelling approach. The results indicate that the developed site specific models showed a significant association between total stem volume and the predictors (dbh and ht). The developed volume models accounted for at least 99% of the total variation in the total stem volume data. This suggests that application of the developed site specific models is highly recommended when accurate results are required. The appropriateness of the developed models was also supported by the fact that the total relative errors (TRE) of these models were lower (range: −0.04% to 0.06%) than the TRE of some previously developed models (range: −12.40% to 41.70%) tested on the present data. |
| format | Article |
| id | doaj-art-e116365bab564431aa92d272876ed79f |
| institution | Kabale University |
| issn | 1687-9368 1687-9376 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Forestry Research |
| spelling | doaj-art-e116365bab564431aa92d272876ed79f2025-02-03T06:07:53ZengWileyInternational Journal of Forestry Research1687-93681687-93762017-01-01201710.1155/2017/39816473981647Site Specific Stem Volume Models for Pinus patula and Pinus oocarpaHerbert Malata0Elisha S. Ngulube1Edward Missanjo2Department of Forestry, Faculty of Environmental Sciences, Mzuzu University, Private Bag 201, Luwinga, Mzuzu 2, MalawiDepartment of Forestry, Faculty of Environmental Sciences, Mzuzu University, Private Bag 201, Luwinga, Mzuzu 2, MalawiDepartment of Forestry, Malawi College of Forestry and Wildlife, Private Bag 6, Dedza, MalawiSustainable management of timber forests requires availability and adequacy of models for accurate estimation of tree volumes. This study was conducted to develop site specific models for estimating individual total tree stem volume of Pinus patula and Pinus oocarpa at Chongoni Timber Plantation in Central Malawi. A total of 32 trees from Pinus patula compartment and 48 trees from Pinus oocarpa compartment were destructively sampled. Various predictors including diameter at breast height (dbh) and height (ht) were run against total stem volume using a nonlinear mixed-effects modelling approach. The results indicate that the developed site specific models showed a significant association between total stem volume and the predictors (dbh and ht). The developed volume models accounted for at least 99% of the total variation in the total stem volume data. This suggests that application of the developed site specific models is highly recommended when accurate results are required. The appropriateness of the developed models was also supported by the fact that the total relative errors (TRE) of these models were lower (range: −0.04% to 0.06%) than the TRE of some previously developed models (range: −12.40% to 41.70%) tested on the present data.http://dx.doi.org/10.1155/2017/3981647 |
| spellingShingle | Herbert Malata Elisha S. Ngulube Edward Missanjo Site Specific Stem Volume Models for Pinus patula and Pinus oocarpa International Journal of Forestry Research |
| title | Site Specific Stem Volume Models for Pinus patula and Pinus oocarpa |
| title_full | Site Specific Stem Volume Models for Pinus patula and Pinus oocarpa |
| title_fullStr | Site Specific Stem Volume Models for Pinus patula and Pinus oocarpa |
| title_full_unstemmed | Site Specific Stem Volume Models for Pinus patula and Pinus oocarpa |
| title_short | Site Specific Stem Volume Models for Pinus patula and Pinus oocarpa |
| title_sort | site specific stem volume models for pinus patula and pinus oocarpa |
| url | http://dx.doi.org/10.1155/2017/3981647 |
| work_keys_str_mv | AT herbertmalata sitespecificstemvolumemodelsforpinuspatulaandpinusoocarpa AT elishasngulube sitespecificstemvolumemodelsforpinuspatulaandpinusoocarpa AT edwardmissanjo sitespecificstemvolumemodelsforpinuspatulaandpinusoocarpa |