Volume equations for Khaya ivorensis A. Chev. plantations in Brazil
Abstract African mahogany (Khaya spp.) plantations are in expansion in Brazil and in the world. This fact justifies the need for studies related to its growth and yield. This paper aimed to evaluate the performance of single-entry and double-entry models for estimating merchantable and total volume for Khaya ivorensis plantations before the first thinning (7 years) and expected final cut (15 years). Volume data was from 100 and 46 trees in Minas Gerais and Pará states, respectively, by using an electronic dendrometer (Criterion RD 1000). Observed volumes were calculated by Smalian’s formula. To validate the optical dendrometer, 10 trees were felled and had their volume measured, and compared with the volumes measured indirectly. The results showed that observed and estimated volumes were statistically equal, and that double-entry models were more precise than single-entry models. Schumacher and Hall model was the best equation to estimate merchantable volume for first thinning and for final cut in Minas Gerais stands. Spurr logarithmized model was the best equation to estimate total volume for first thinning and Spurr model for final cut in Pará stands. All chosen equations can be used to quantify merchantable and total volumes of Khaya ivorensis grown under similar conditions.
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Academia Brasileira de Ciências
2018
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oai:scielo:S0001-376520180007032852019-01-15Volume equations for Khaya ivorensis A. Chev. plantations in BrazilOLIVEIRA,XIMENA M. DERIBEIRO,ANDRESSAFERRAZ FILHO,ANTONIO CARLOSMAYRINCK,RAFAELLA C.LIMA,RENATO R. DESCOLFORO,JOSÉ ROBERTO S. African mahogany Forest mensuration Non-destructive measurements Thinning Abstract African mahogany (Khaya spp.) plantations are in expansion in Brazil and in the world. This fact justifies the need for studies related to its growth and yield. This paper aimed to evaluate the performance of single-entry and double-entry models for estimating merchantable and total volume for Khaya ivorensis plantations before the first thinning (7 years) and expected final cut (15 years). Volume data was from 100 and 46 trees in Minas Gerais and Pará states, respectively, by using an electronic dendrometer (Criterion RD 1000). Observed volumes were calculated by Smalian’s formula. To validate the optical dendrometer, 10 trees were felled and had their volume measured, and compared with the volumes measured indirectly. The results showed that observed and estimated volumes were statistically equal, and that double-entry models were more precise than single-entry models. Schumacher and Hall model was the best equation to estimate merchantable volume for first thinning and for final cut in Minas Gerais stands. Spurr logarithmized model was the best equation to estimate total volume for first thinning and Spurr model for final cut in Pará stands. All chosen equations can be used to quantify merchantable and total volumes of Khaya ivorensis grown under similar conditions.info:eu-repo/semantics/openAccessAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências v.90 n.4 20182018-12-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703285en10.1590/0001-3765201820170852 |
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OLIVEIRA,XIMENA M. DE RIBEIRO,ANDRESSA FERRAZ FILHO,ANTONIO CARLOS MAYRINCK,RAFAELLA C. LIMA,RENATO R. DE SCOLFORO,JOSÉ ROBERTO S. |
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OLIVEIRA,XIMENA M. DE RIBEIRO,ANDRESSA FERRAZ FILHO,ANTONIO CARLOS MAYRINCK,RAFAELLA C. LIMA,RENATO R. DE SCOLFORO,JOSÉ ROBERTO S. Volume equations for Khaya ivorensis A. Chev. plantations in Brazil |
author_facet |
OLIVEIRA,XIMENA M. DE RIBEIRO,ANDRESSA FERRAZ FILHO,ANTONIO CARLOS MAYRINCK,RAFAELLA C. LIMA,RENATO R. DE SCOLFORO,JOSÉ ROBERTO S. |
author_sort |
OLIVEIRA,XIMENA M. DE |
title |
Volume equations for Khaya ivorensis A. Chev. plantations in Brazil |
title_short |
Volume equations for Khaya ivorensis A. Chev. plantations in Brazil |
title_full |
Volume equations for Khaya ivorensis A. Chev. plantations in Brazil |
title_fullStr |
Volume equations for Khaya ivorensis A. Chev. plantations in Brazil |
title_full_unstemmed |
Volume equations for Khaya ivorensis A. Chev. plantations in Brazil |
title_sort |
volume equations for khaya ivorensis a. chev. plantations in brazil |
description |
Abstract African mahogany (Khaya spp.) plantations are in expansion in Brazil and in the world. This fact justifies the need for studies related to its growth and yield. This paper aimed to evaluate the performance of single-entry and double-entry models for estimating merchantable and total volume for Khaya ivorensis plantations before the first thinning (7 years) and expected final cut (15 years). Volume data was from 100 and 46 trees in Minas Gerais and Pará states, respectively, by using an electronic dendrometer (Criterion RD 1000). Observed volumes were calculated by Smalian’s formula. To validate the optical dendrometer, 10 trees were felled and had their volume measured, and compared with the volumes measured indirectly. The results showed that observed and estimated volumes were statistically equal, and that double-entry models were more precise than single-entry models. Schumacher and Hall model was the best equation to estimate merchantable volume for first thinning and for final cut in Minas Gerais stands. Spurr logarithmized model was the best equation to estimate total volume for first thinning and Spurr model for final cut in Pará stands. All chosen equations can be used to quantify merchantable and total volumes of Khaya ivorensis grown under similar conditions. |
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Academia Brasileira de Ciências |
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2018 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703285 |
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