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Breeding for wood quality - a perspective for the future

Author: Verryn, SD Date: 2008 A challenge for breeders and wood quality researchers of today is to appropriately respond to a complex environment demanding more productivity, higher quality, and a quicker adaptation of their crops to rapid changes. This is mirrored in the ... Read more
Challenges and advances in genetically improving trees for the plantation forestry sector

Author: Verryn, SD ; Snedden, CL Date: 30 Aug 2010 This presentation outlines the South African plantation forestry sector and its contributions and improvement in productivity, acquiring genetic diversity, challenges and advances in genetically improving trees as well as transforming the ... Read more
Community-company partnerships in forestry in South Africa – An examination of trends

Author: Ojwang, A Date: 2000 Partnerships between communities and private companies have been tried and tested in various regions within Africa and the world. Community-Private-Public Partnerships exist in various sectors such as mining, agriculture, tourism and forestry. ... Read more
Comparison of collinearity mitigation techniques used in predicting BLUP breeding values and genetic gains over generations

Author: Eatwell, KA ; Verryn, SD ; Roux, CZ ; Geerthsen, PJM Date: 2011 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 ... Read more
Dry mass allocation, water use efficiency and delta C-13 in clones of Eucalyptus grandis, E-grandis x camaldulensis and E-grandis x nitens grown under two irrigation regimes

Author: Le Roux, D ; Stock, WD ; Bond, WJ ; Maphanga, D Date: May 1996 Clonal variation in water use efficiency (WUE), dry mass accumulation and allocation, and stable carbon isotope ratio (delta (13)C) of crude leaf fibre extracts was determined in six clones of Eucalyptus grandis W. Hill ex Maiden grown for ... Read more
Evidence, perceptions, and trade-offs associated with invasive alien plant control in the Table Mountain National Park, South Africa

Author: Van Wilgen, B Date: 2012 The Table Mountain National Park is a 265 km2 protected area embedded within a city of 3.5 million people. The park contains an extremely diverse flora with many endemic species, and has been granted World Heritage Site status in recognition ... Read more
Examining pine spectral separability using hyperspectral data from an airborne sensor : an extension of field-based results

Author: Van Aardt, JAN ; Wynne, RH Date: Jan 2007 Three southern USA forestry species, loblolly pine (Pinus taeda), Virginia pine (Pinus virginiana), and shortleaf pine (Pinus echinata), were previously shown to be spectrally separable (83% accuracy) using data from a full-range spectro-radiometer ... Read more
Forestry and streamflow reductions in South Africa: a reference system for assessing extent and distribution

Author: Scott, DF ; Le Maitre, David C ; Fairbanks, DHK Date: Jul 1998 Forestry is an important sector of industry in South Africa but the growing of timber places significant demands on the available water resources. Yet, a ready source of information on the extent, and probable hydrological impacts, of ... Read more
Forestry contracting in South Africa

Author: Khosa, M Date: 2000 The outsourcing of forestry activities over the past decade has created an industry with an annual turnover of R600 million and 35000 employees (Edwards, 2000). During the past decade forestry companies have switched from employing some of ... Read more
Global extent and determinants of savanna and forest as alternative biome states

Author: Staver, C ; Archibald, S ; Levin, SA Date: Oct 2011 Theoretically, fire–tree cover feedbacks can maintain savanna and forest as alternative stable states. However, the global extent of fire- driven discontinuities in tree cover is unknown, especially accounting for seasonality and soils. The ... Read more
Integrating remote sensing and ancillary data for regional ecosystem assessment: eucalyptus grandis agro-system in kwazulu-Natal, South Africa

Author: Cho, Moses A ; Van Aardt, J ; Main, Russell S ; Majeke, B ; Mathieu, Renaud SA ; Norris-Rogers, M ; Du Plessis, M ; Ramoelo, Abel Date: Jul 2009 The study demonstrates that the integration of remote sensing and in situ data could be important in providing more accurate estimates of E. grandis state in KwaZulu Natal, South Africa compared to remote sensing models. Such modelling effort ... Read more
Intellectual property management and commercialisation of forest genetic resources

Author: Verryn, SD Date: Jul 2008 The CSIR Tree Improvement Research Group has an approximately 50 year old eucalypt and pine species breeding research program and during this time over 50 species and hybrids have been included in the program. By 1994, the CSIR initiated it’s ... Read more
Invasive alien trees and water resources in South Africa: case studies of the costs and benefits of management

Author: Le Maitre, David C ; Van Wilgen, BW ; Gelderblom, CM ; Bailey, C ; Chapman, RA ; Nel, JA Date: 01 May 2002 Invasive alien plants are consumptive water-users, and may have reduced river flows in South Africa by about 6.7% according to a broad-scale study. An effective programme to bring the invasions under control would cost about US$ 92 million ... Read more
The management of fire-adapted ecosystems in an urban setting: the case of Table Mountain National Park, South Africa

Author: Van Wilgen, BW ; Forsyth, GG ; Prins, P Date: Mar 2012 The Table Mountain National Park is a 265-km² conservation area embedded within a city of 3.5 million people. The highly diverse and unique vegetation of the park is both fire prone and fire adapted, and the use of fire forms an integral part ... Read more
Managing riparian zone vegetation to sustain streamflow: results of paired catchment experiments in South Africa

Author: Scott, DF Date: Jul 1999 The reductions in streamflow associated with timber plantations are of particular concern in South Africa and, as a means of sustaining flows; permits granted by the state for the establishment of plantations have required that plantings ... Read more
Physio-climatic classification of South Africa's woodland biome

Author: Fairbanks, DHK Date: Jul 2000 In an effort to develop more holistic ecosystem approaches to resource assessment and management, landscapes need to be stratified into homogeneous geographic regions. These regions can then be used in a monitoring framework to develop reliable ... Read more
Quantifying and modelling the effects of environmental factors on wood properties of Eucalyptus grandis in South Africa

Author: Naidoo, Sasha Date: Mar 2011 This research aimed to quantify and model the effects of specific environmental variables on the wood quality of Eucalyptus grandis in the warm temperate (WT) and sub-tropical (ST) forestry regions in South Africa using nondestructive, rapid ... Read more
Re-impact: forest based bioenergy for sustainable development in developing countries

Author: Amezaga, JM ; Harrison, J ; Von Maltitz, Graham P ; Tennigkeit, T ; Tiwari, S ; Windhorst, K Date: Jun 2009 Re-Impact "Rural Energy Production from Bioenergy Projects" is a project funded by the European Union Aid Cooperation office which is promoting a sustainability assessment framework for bioenergy projects focussed on rural development in ... Read more
Three centuries of managing introduced conifers in South Africa: benefits, impacts, changing perceptions and conflict resolution

Author: Van Wilgen, BW ; Richardson, DM Date: May 2012 Alien conifers, mainly pines, have been planted in South Africa for a range of purposes for over 300 years. Formal plantations cover 660 000 ha of the country, and invasive stands of varying density occur on a further 2.9 million ha. These ... Read more
Trends in savanna structure and composition along an aridity gradient in the Kalahari

Author: Scholes, RJ ; Dowty, PR ; Caylor, K ; Parsons, DAB ; Frost, PGH ; Shugart, HH Date: Jun 2002 The Kalahari sand sheet occupies 2.5 million ha in southern Africa. It is an area with relatively similar deep Aeolian soils, and a strong south to north gradient in rainfall, from 200 to 1000 mm mean annual precipitation (MAP) in the region ... Read more

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