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1. A South African softwood sawtimber supply chain case study

Author:
Pierre A Ackerman; Elizabeth A van der Merwe; Reino E Pulkki
Source:
Southern forests 2017 v.79 no.4 pp. 329-338
ISSN:
2070-2639
Subject:
case studies; cash flow analysis; felling; forest roads; forests; geographic information systems; harvesting; humans; landscapes; marketing; roadsides; sawlogs; softwood; supply chain
Abstract:
... Supply chain management principles were analysed by investigating the effects of smaller-scale and incremental interventions in a forest-to-mill value chain on financial returns and forest resource use in an Eastern Cape case study area. Three previous studies provided input by determining fibre balances, a terrain factor, and primary and secondary transport travel speeds and efficiencies. Network ...
DOI:
10.2989/20702620.2016.1255380

2. A baseline classification of riparian woodland plant communities in the Okavango Delta, Botswana

Author:
Gaolathe Tsheboeng; Mike Murray-Hudson; Keotshepile Kashe
Source:
Southern forests 2016 v.78 no.2 pp. 97-104
ISSN:
2070-2639
Subject:
Croton; Garcinia; Hyphaene; Syzygium; Vachellia; body water; cluster analysis; community structure; floodplains; forests; indicator species; monitoring; plant communities; riparian areas; species diversity; surface water; woodlands; Botswana
Abstract:
... In the Okavango Delta information on the riparian woodland vegetation community composition and distribution is generally lacking. Past studies in the Delta were mainly focused on the quantitative classification of seasonal floodplain herbaceous vegetation communities. The aim of this study was to determine riparian woodland vegetation communities in the Okavango Delta. Vegetation sampling was con ...
DOI:
10.2989/20702620.2015.1108619

3. A comparison between excavator-based harvester productivity in coppiced and planted Eucalyptus grandis compartments in KwaZulu-Natal, South Africa

Author:
Muedanyi Ramantswana; Andrew McEwan; Jaap Steenkamp
Source:
Southern forests 2013 v.75 no.4 pp. 239-246
ISSN:
2070-2639
Subject:
Eucalyptus grandis; forestry equipment; forests; harvesters; harvesting; labor; mechanization; planting; pulpwood; regrowth; stem form; stems; trees; South Africa
Abstract:
... Due to the labour challenges in South Africa, mechanised forestry equipment has increasingly been required to operate in complex forest conditions – such as coppiced Eucalyptus compartments – where they have not operated before. For this reason, harvesters are either used in certain coppiced compartments with uncertain productivity expectations, or harvesters are not used in these compartments due ...
DOI:
10.2989/20702620.2013.858213

4. A comparison of collinearity mitigation techniques used in predicting BLUP breeding values and genetic gains over generations

Author:
K A Eatwell; S D Verryn; C Z Roux; P JM Geerthsen
Source:
Southern forests 2011 v.73 no.3-4 pp. 155-163
ISSN:
2070-2639
Subject:
Eucalyptus grandis; Pinus patula; breeding value; genetic improvement; parents; prediction; progeny; tree breeding
Abstract:
... Collinearity potentially has a negative impact on the prediction of genetic gains in tree breeding programs. This study investigated the reliability and impact of best linear unbiased prediction (BLUP) using various collinearity mitigation techniques and of two computational numerical precisions on the genetic gains in breeding populations. Multiple-trait, multiple-trial BLUP selection scenarios w ...
DOI:
10.2989/20702620.2011.639490

5. A comparison of diameter distribution models for Khaya ivorensis A.Chev. plantations in Brazil

Author:
Rafaella Carvalho Mayrinck; Antonio Carlos Ferraz Filho; Andressa Ribeiro; Ximena Mendes de Oliveira; Renato Ribeiro de Lima
Source:
Southern forests 2018 v.80 no.4 pp. 373-380
ISSN:
2070-2639
Subject:
plantations; models; trees; Weibull statistics; stand basal area; Khaya ivorensis; databases; prediction; forests; Brazil
Abstract:
... The purpose of this study was to compare Beta, Gamma, Johnson's SB and Weibull functions fitted by different methods for describing the horizontal structure of Khaya ivorensis (African mahogany) plantations in Brazil. The database comprised 128 plots from six plantations at varying ages. The function fits were compared using the Kolmogoroff–Smirnoff test, mean bias and mean absolute error for the ...
DOI:
10.2989/20702620.2018.1463189

6. A comparison of planting and coppice regeneration of Eucalyptus grandis × Eucalyptus urophylla clones in South Africa

Author:
Jacob W Crous; Louisa Burger
Source:
Southern forests 2015 v.77 no.4 pp. 277-285
ISSN:
2070-2639
Subject:
Eucalyptus grandis; Eucalyptus urophylla; atmospheric precipitation; clones; coppicing; cost effectiveness; forests; hybrids; planting; stumps; trees; South Africa
Abstract:
... Results from two coppice compared to replant trials are presented that originated from clone by site interaction (CSI) trials established on high‑ and low‑productivity sites in subtropical coastal KwaZulu‑Natal, South Africa. After the 84‑month CSI trial measurements were completed the trees were harvested. Selected plots were allowed to coppice with the remainder replanted to the same four Eucaly ...
DOI:
10.2989/20702620.2015.1063031

7. A comparison of productive and non-productive green water-use efficiency of Podocarpus henkelii and Pinus patula in the KwaZulu-Natal Midlands

Author:
Hartley H Bulcock; Mark B Gush; Graham PW Jewitt
Source:
Southern forests 2014 v.76 no.2 pp. 75-84
ISSN:
2070-2639
Subject:
Pinus patula; Podocarpus; afforestation; canopy; evaporation; forest plantations; forests; fynbos; grasslands; introduced species; models; planning; planting; soil; transpiration; trees; water management; water use efficiency; South Africa
Abstract:
... A number of studies undertaken in South Africa to quantify the green water-use (total evaporation) of introduced commercial forestry species have shown conclusively that green water-use from commercial forest plantations is substantially higher than from the original grasslands or fynbos that were replaced by afforestation. Green water can be categorised into productive (transpiration) and non-pro ...
DOI:
10.2989/20702620.2014.915451

8. A comparison of the cost-effectiveness of different eucalypt cut-stump control management options to reduce competition from coppice regrowth during stand establishment in Mpumalanga, South Africa

Author:
Jonathan C Roberts; Keith M Little; Marnie E Light
Source:
Southern forests 2018 v.80 no.3 pp. 261-268
ISSN:
2070-2639
Subject:
triclopyr; felling; mechanization; coppicing; seedlings; Eucalyptus macarthurii; stand basal area; regrowth; control methods; trees; stand establishment; cost effectiveness; cambium; bark; stumps; mortality; forests; South Africa
Abstract:
... Selected cut-stump (Cut_surface) and basal frill (Basal_frill) treatments were tested on Eucalyptus macarthurii cut stumps that had previously been coppiced multiple times. Treatments included the application of herbicide (triclopyr as an amine salt, 360 g L⁻¹), either to the cut-surface or to a basal frill (cuts made through the bark and into the cambium at the base of the tree). These treatments ...
DOI:
10.2989/20702620.2017.1354283

9. A decision support tool approach based on the Electre TRI-B method for the valorisation of tropical timbers from the Congo Basin: an application for glulam products

Author:
René Oum Lissouck; Régis Pommier; Franck Taillandier; Jean K Mvogo; Denys Breysse; Louis M Ayina Ohandja
Source:
Southern forests 2018 v.80 no.4 pp. 361-371
ISSN:
2070-2639
Subject:
basins; decision support systems; endangered species; engineering; forests; glulam; markets; tropical wood
Abstract:
... An alternative approach to the formal management strategy of tropical timber species from the Congo Basin was investigated. It focused on the development of glulam, with an aim to specify a decision support model for the valorisation of tropical timber species considered for use in these products. There were 76 forest species analysed regarding ecological, engineering and social criteria according ...
DOI:
10.2989/20702620.2018.1463153

10. A first-approximation simple dynamic growth model for forest teak plantations in Gujarat state of India

Author:
Vindhya Prasad Tewari; Bilas Singh
Source:
Southern forests 2018 v.80 no.1 pp. 59-65
ISSN:
2070-2639
Subject:
mathematical models; plantations; stand density; forest management; growth models; Tectona grandis; stand basal area; tropical wood; forests; India
Abstract:
... Tectona grandis (teak) is one of the most important tropical timber species occurring naturally in India. In India, teak is the single most important commercial timber species. Scientifically sound growth models, based on advanced modelling techniques, are often not available, although they are necessary for the successful management of teak stands in the country. Long-term forest planning require ...
DOI:
10.2989/20702620.2016.1277644

11. A model to predict productivity of different chipping operations

Author:
Mohammad R Ghaffariyan; Raffaele Spinelli; Mark Brown
Source:
Southern forests 2013 v.75 no.3 pp. 129-136
ISSN:
2070-2639
Subject:
biomass; case studies; equations; feeding methods; harvesting; models; prediction; pulp; trees; wood; Australia; Italy; North America; South America
Abstract:
... The chipping operation is an important component of harvesting systems producing biomass and pulp chips. This paper aimed to develop a valid model to predict the productivity of chipping as part of these operations. Over a number of years more than 200 different time studies were conducted on chipping operations in Italy and Australia. Multiple regressions and backward stepwise data analysis metho ...
DOI:
10.2989/20702620.2013.816233

12. A new screening method for Ganoderma philippii tolerance in tropical Acacia species

Author:
Abdul Gafur; Aswardi Nasution; Muhammad Yuliarto; Wong Ching Yong; Mukesh Sharma
Source:
Southern forests 2015 v.77 no.1 pp. 75-81
ISSN:
2070-2639
Subject:
Acacia mangium; Ganoderma; Hevea brasiliensis; biological control agents; crossing; disease control; forests; genotype; hybrids; inoculum; pathogens; planting; rapid methods; root rot; screening; silviculture; wood
Abstract:
... Red root rot disease caused by Ganoderma philippii is one of the most economically important diseases of tropical Acacia species. Research on field control of the disease has to date focused on inoculum reduction, silviculture practices and application of biological control agents. Incorporation of tolerant genotypes, a key component of integrated disease management, has not been adequately explor ...
DOI:
10.2989/20702620.2014.999304

13. A productivity model for first thinning of Pinus patula using a tractor and double-drum winch in South Africa

Author:
Thabo Moloi; Michal Brink; Paxie W Chirwa; Elisha Ngulube
Source:
Southern forests 2018 v.80 no.2 pp. 169-173
ISSN:
2070-2639
Subject:
Pinus patula; experimental design; farms; forests; harvesting; models; regression analysis; tractors; weather; South Africa
Abstract:
... The productivity of skidding tractors in intermediate harvesting operations has not been determined in Mpumalanga, South Africa. The objective of this study was to develop a productivity model using a farm tractor in first thinning operations in Pinus patula compartments. A work study design was used to assess the performance of a skidding agricultural tractor. From 350 samples, important data var ...
DOI:
10.2989/20702620.2017.1312904

14. A review of carbon dynamics and assessment methods in the miombo woodlands

Author:
Ferdinand Handavu; Paxie W Chirwa; Stephen Syampungani; Larwanou Mahamane
Source:
Southern forests 2017 v.79 no.2 pp. 95-102
ISSN:
2070-2639
Subject:
biomass; carbon; carbon sinks; forests; issues and policy; land use and land cover maps; landscapes; livelihood; models; socioeconomics; spatial variation; stand density; sustainable forestry; uncertainty; wood; woodlands; Southern Africa
Abstract:
... Provision of accurate carbon (C) measurements and analysis are critical components in quantification of C stocks. The objectives of this review were to (1) compile and synthesise current knowledge of available methods for C stock estimation, (2) examine socio-economic drivers of land-use and land-cover change and their influence on woodland C stocks and (3) identify gaps of knowledge and methodolo ...
DOI:
10.2989/20702620.2016.1277643

15. A review of management impacts on the soil productivity of South African commercial forestry plantations and the implications for multiple-rotation productivity

Author:
Louis Titshall; Steven Dovey; Diana Rietz
Source:
Southern forests 2013 v.75 no.4 pp. 169-183
ISSN:
2070-2639
Subject:
biomass; forestry; forests; mechanization; monitoring; plantations; soil; soil productivity
Abstract:
... An overview of southern African research that has investigated the impact of management practices that can potentially affect the long-term site productivity of plantations is presented, with an emphasis of these impacts on soil productivity and with the implications for multiple-rotation site productivity. Activities that are most likely to cause long-term changes in soil productivity are identif ...
DOI:
10.2989/20702620.2013.858210

16. A serious shoot and leaf disease caused by Colletotrichum theobromicola discovered on eucalypts in South Africa

Author:
Myriam Solís; Michael J Wingfield; Izette Greyling; Nam Q Pham
Source:
Southern forests 2022 v.84 no.1 pp. 8-20
ISSN:
2070-2639
Subject:
Colletotrichum; Eucalyptus camaldulensis; Eucalyptus grandis; Eucalyptus urophylla; anthracnose; foliar diseases; forest industries; fungi; genes; leaves; nucleotide sequences; pathogenicity; pathogens; phylogeny; Brazil; South Africa
Abstract:
... Eucalypt plantations in South Africa make up an important part of the local forestry industry. Recently, one-year-old nursery plants of a Eucalyptus grandis × Eucalyptus urophylla variety displayed symptoms of leaf and shoot anthracnose disease. Samples were collected from these plants and isolations were made from the disease symptoms. Isolates were identified based on their morphological charact ...
DOI:
10.2989/20702620.2021.2005454

17. A single dominant Ganoderma species is responsible for root rot of Acacia mangium and Eucalyptus in Sumatra

Author:
M PA Coetzee; B D Wingfield; G D Golani; B Tjahjono; A Gafur; M J Wingfield
Source:
Southern forests 2011 v.73 no.3-4 pp. 175-180
ISSN:
2070-2639
Subject:
Acacia mangium; Eucalyptus; Ganoderma; fruiting; fruiting bodies; pathogens; phylogeny; plantations; root rot; roots; trees; Indonesia
Abstract:
... Ganoderma root rot is the most serious disease affecting commercially planted Acacia mangium in plantations in Indonesia. Numerous Ganoderma spp. have been recorded from diseased trees of this species and to a lesser extent Eucalyptus, causing confusion regarding the primary cause of the disease. In this study, a large collection of Ganoderma isolates were obtained from the roots of A. mangium sho ...
DOI:
10.2989/20702620.2011.639488

18. A stratification of the South African forestry landscape based on climatic parameters

Author:
JH Louw; I Germishuizen; CW Smith
Source:
Southern forests 2011 v.73 no.1 pp. 51-62
ISSN:
2070-2639
Subject:
analysis of variance; case studies; climatic factors; databases; decision making; forestry; forests; landscape ecology; landscapes; models; plant physiology; plantations; prediction; risk management; soil surveys; temperature; South Africa
Abstract:
... The benefits of high-resolution forest site classification systems have been widely acknowledged in South Africa as a prerequisite for decision-making in forestry management. Although substantial research and development work have been done on categorising and mapping the soil and geological environment, surprisingly little has been done to improve our understanding of the role of climate in plant ...
DOI:
10.2989/20702620.2011.574825

19. A synthesis on the impact of non-native conifer plantations on ant and beetle diversity in north-western Patagonia

Author:
Juan C Corley; Romina D Dimarco; Déborah Fischbein; María V Lantschner; Andrés S Martínez; Maité Masciocchi; Analia Mattiacci; Juan Paritsis; José M Villacide
Source:
Southern forests 2018 v.80 no.4 pp. 285-291
ISSN:
2070-2639
Subject:
Coleoptera; Pinus; afforestation; conifers; developing countries; forests; habitats; indigenous species; insects; monitoring; plantations; softwood; species richness; taxonomy; trees; Argentina
Abstract:
... Softwood forestry with non-native tree species is increasing worldwide and especially in many developing countries of the Southern Hemisphere. Tree plantations are beneficial in environmental and socioeconomic aspects, but at the same time there are recognised costs associated with afforestation. Our aim was to revise the existing information on the impact of exotic conifer plantations in north-we ...
DOI:
10.2989/20702620.2018.1432536

20. A taper function for Pseudotsuga menziesii plantations in Spain

Author:
Carlos A López-Sánchez; Roque Rodríguez-Soalleiro; Fernando Castedo-Dorado; Sacramento Corral-Rivas; Juan G Álvarez-González
Source:
Southern forests 2016 v.78 no.2 pp. 131-135
ISSN:
2070-2639
Subject:
Pseudotsuga menziesii; autocorrelation; bark; equations; forests; models; plantations; trees; Spain
Abstract:
... Five stem taper models belonging to three different taper function categories were fitted to data corresponding to 282 Pseudotsuga menziesii trees. The trees were selected in the area surrounding 61 research plots installed in Galicia, Asturias and the Basque Country, northern Spain. The models were simultaneously fitted to observed values of diameter outside bark and inside bark. A third-order co ...
DOI:
10.2989/20702620.2015.1136505