Oliveira Ximena M DE, Ribeiro Andressa, Ferraz Filho Antonio Carlos, Mayrinck Rafaella C, Lima Renato R DE, Scolforo José Roberto S
Departamento de Ciências Florestais, Universidade Federal de Lavras, Av. Doutor Sylvio Menicucci, 1001, Kennedy, 37200-000 Lavras, MG, Brazil.
Universidade Federal do Piauí, Campus Universitário Professora Cinobelina Elvas, Av. Manoel Gracindo, Km 01, Planalto Horizonte, 64900-000 Bom Jesus, PI, Brazil.
An Acad Bras Cienc. 2018 Oct-Dec;90(4):3285-3298. doi: 10.1590/0001-3765201820170852. Epub 2018 Sep 3.
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.
非洲桃花心木（卡雅楝属树种）种植园在巴西乃至全球都在不断扩张。这一事实说明了开展与其生长和产量相关研究的必要性。本文旨在评估单入口模型和双入口模型在估算科特迪瓦伦西亚桃花心木种植园首次间伐（7年）和预期最终采伐（15年）前的可销售材积和总材积方面的表现。材积数据分别来自米纳斯吉拉斯州和帕拉州的100棵和46棵树木，使用电子测树仪（Criterion RD 1000）进行测量。实测材积通过斯马良公式计算得出。为验证光学测树仪，砍伐了10棵树并测量其材积，然后与间接测量的材积进行比较。结果表明，实测材积和估算材积在统计学上相等，且双入口模型比单入口模型更精确。舒马赫和霍尔模型是估算米纳斯吉拉斯林分首次间伐和最终采伐时可销售材积的最佳方程。斯珀尔对数模型是估算帕拉林分首次间伐时总材积的最佳方程，而斯珀尔模型则是估算帕拉林分最终采伐时总材积的最佳方程。所有选定的方程均可用于量化在类似条件下生长的科特迪瓦伦西亚桃花心木的可销售材积和总材积。
