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Alternative Taper Curve Estimation Methods for Eucalyptus cloeziana (F. Muell.)
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: K. P.A. Eerikäinen --- Faculty of Forestry, Finland D. Mabvurira --- , Zimbabwe J. Saramäki --- ,Three types of taper estimation methods for Eucalyptus cloeziana were applied and compared by using Zambian and Zimbabwean plantation data. The methods are: (1) Schumacher's taper equation, (2) diameter prediction method and (3) polynomial taper curve. The Schumacher's taper equation... -
Variation in Wood Properties of Eucalyptus nitens in a Provenance Trial on the Eastern Transvaal Highveld in South Africa
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.C. Purnell --- D.R. de Wet Forestry Research Centre,Eucalyptus nitens is one of the four important cold-tolerant eucalypts grown for mining timber and pulpwood on the eastern Transvaal highveld in South Africa. In 1983 an active genetic improvement programme was initiated to improve growth rate, stem form and... -
Tree taper models for Cupressus lusitanica plantations in Ethiopia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Leakemariam Berhe Göran ArnoldssonTo provide a taper model for planning and management of Cupressus lusitanica plantations in Ethiopia, seven taper models were compared. Four performance indicator statistics were used for comparing the models in their ability to estimate tree diameter, and total and... -
Effect of weeding and fertilisation on bark thickness and stem form of seven pine species on a low-elevation site at Usutu, Swaziland
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JW Crous --- , South Africa AR Morris --- , South Africa S Khoza --- , SwazilandOn a low-elevation site at Usutu alternative species to Pinus elliottii, the species recommended in the past for such sites, were planted to evaluate growth differences. At rotation age, destructive stem profile analyses were conducted on some of the trees... -
Estimation of taper rates and volume of smaller-sized logs in spotted gum saw timber plantations in Southeast Queensland, Australia
Item type: Journal Article • Journal: Southern Hemisphere Forestry Journal • Authors: TN Maraseni G Cockfield A ApanSpotted gum (Corymbia citriodora subsp. variegata) is a popular tree species for hardwood saw timber plantations in Southeast Queensland (SEQ), Australia. In many parts of the world, logs up to 10cm top diameter are considered to be merchantable logs and... -
Volume estimation of Cryptomeria japonica logs in southern Brazil using artificial intelligence models
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Carlos R Sanquetta --- Forest Sciences Department, Brazil Luani RO Piva --- Postgraduate Program on Tropical Forests Sciences, Brazil Jaime Wojciechowski --- Professional and Technological Education Sector, Brazil Ana PD Corte --- Forest Sciences Department, Brazil Ana B Schikowski --- Forest Sciences Department, BrazilThis study aimed to test taper functions and artificial intelligence (AI) models in order to estimate merchantable volumes of Japanese cedar (Cryptomeria japonica) trees in a homogenous plantation in southern Brazil. A total of 30 individuals were rigorously scaled and... -
Developing a taper model for the Pinus elliottii × P. caribaea var. hondurensis hybrid in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Madeleen Algera --- Planning Department, Komatiland Forest, South Africa Christoph Kätsch --- Postgraduate Forest Programme, South Africa Paxie W Chirwa --- Postgraduate Forest Programme, South AfricaA relatively new hybrid, Pinus elliottii × P. caribaea var. hondurensis (Pexc), for which a taper model does not exist, is being planted commercially in South Africa. This study primarily focused on developing a taper model for Pexc in South... -
Mixed-effect non-linear modelling for diameter estimation along the stem of Tectona grandis in mid-western Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Luciano Rodrigo Lanssanova --- Postgraduate Program of Forestry Sciences, Department of Forest Engineering, Brazil Sebastião do Amaral Machado --- Postgraduate Program of Forestry Engineering, Department of Forest Engineering, Brazil Alexandre Techy de Almeida Garrett --- Postgraduate Program of Forestry Sciences, Department of Forest Engineering, Brazil Izabel Passos Bonete --- Postgraduate Program of Forestry Sciences, Department of Forest Engineering, Brazil Allan Libanio Pelissari --- Postgraduate Program of Forestry Engineering, Department of Forest Engineering, Brazil Afonso Figueiredo Filho --- Postgraduate Program of Forestry Sciences, Department of Forest Engineering, Brazil Franciele Alba da Silva --- Postgraduate Program of Forestry Engineering, Department of Forest Engineering, Brazil Lucas Dalmolin Ciarnoschi --- Postgraduate Program of Forestry Engineering, Department of Forest Engineering, BrazilThis study evaluated the efficiency of taper functions and the application of mixed-effect modelling for diameter estimation along the stems of Tectona grandis. We sampled 266 trees of Tectona grandis, measuring the diameter at relative heights for volume determination, grouping... -
The effect of planting density on the stem form of Pinus patula trees
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: RA Charlton --- , South Africa Z Naghizadeh --- , South Africa A Kunneke --- , South Africa CB Wessels --- , South AfricaIn this study the effect of planting density on the stem form of Pinus patula trees was investigated. Four different spacing treatments of 403, 1 097, 1 808, and 2 981 stems per hectare (spha), and four stem form properties... -
Machine learning and regression models to predict multiple tree stem volumes for teak
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ivaldo da Silva Tavares Júnior --- , Brazil Jianne Rafaela Mazzini de Souza --- , Brazil Lucas Sérgio de Sousa Lopes --- , Brazil Leonardo Pereira Fardin --- , Brazil Gianmarco Goycochea Casas --- , Brazil Ricardo Rodrigues de Oliveira Neto --- , Brazil Rodrigo Vieira Leite --- , Brazil Helio Garcia Leite --- , BrazilThe quantification of a stand’s wood stock is one of the most important procedures for Tectona spp. (teak) management. An optimal method for estimating tree volume must accommodate the variation of the data collected in the inventory. This study evaluated...