Search
Search results for
We found
12 results for you
-
Genetic Improvement of Timber Yield and Wood Quality in Eucalyptus Grandis (Hill) Maiden
Item type: Journal Article • Journal: South African Forestry Journal • Authors: G. van Wyk --- Division of Forest Science and Technology,Results of a partial diallel progeny test of Eucalyptus grandis assessed at ages 5, 36, 60 and 105 months are presented. Large genetic variations among full-sib families were found for all traits studied, e.g. the mean tree volume per family... -
The Genetic Control of Ring Width, Wood Density and Tracheid Length in the Juvenile Core of Pinus patula
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.D. Barnes --- Forest Research Centre, Zimbabwe J.S. Birks --- , United Kingdom G. Battle --- Forest Research Centre, Zimbabwe L.J. Mullin --- Forest Research Centre, ZimbabweControlled crosses were made between six Pinus patula Schiede & Deppe plus trees selected in plantations. Six full-sib families and two commercial checks were planted in randomised complete block thrice-replicated progeny tests at two sites in Zimbabwe. At 7,5 years,... -
Genotype by environment interaction for volume growth at 6 years of age in a series of five Pinus patula progeny trials in southern Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Arnulf Kanzler --- Sappi Forest Research, South Africa Sieg F. Hagedorn --- , South Africa Gary R. Hodge --- CAMCORE, USA William S. Dvorak --- CAMCORE, USAGenotype x environment interaction was investigated in a series of 5 Pinus patula progeny trials planted by the Institute for Commercial Forestry Research in southern Africa. The trials were established from Mpumalanga to the North-eastern Cape in a balanced 7x7... -
Genetic characterisation of a Eucalyptus nitens base breeding population in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Tammy-L Swain --- Institute for Commercial Forestry Research, South Africa SteveD Verryn --- Forestry and Agricultural Biotechnology Institute, South Africa MarkD Laing --- School of Agricultural Earth and Environmental Sciences, South AfricaThe measurement and statistical analysis of data from eight Eucalyptus nitens trials, established in the summer rainfall forestry region of South Africa during the 1980s and 1990s, have enabled the characterisation of the Institute for Commercial Forestry Research's breeding population... -
Genetic control of wood density and bark thickness, and their correlations with diameter, in pure and hybrid populations of Eucalyptus grandis and E. urophylla in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: ECL Retief TK StangerTree diameter under and over bark at breast height (dbh), wood density and bark thickness were assessed on samples from control-pollinated families of Eucalyptus grandis, E. urophylla, E. grandis × E. urophylla and E. urophylla × E. grandis. The material... -
Benthic macroinvertebrate assemblage composition and distribution pattern in the upper Mthatha River, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AS Niba --- Department of Biological and Environmental Science, South Africa SP Mafereka --- Department of Biological and Environmental Science, South AfricaBenthic macroinvertebrates were sampled and environmental variables measured at Langeni Forest and Kambi Valley, two sites of varying degrees of human impact in the upper Mthatha River, South Africa, in 2010–2011. Four species, Simulium adersi Pomeroy, Baetis harrisoni Barnard, Pseudocloeon... -
Estimates of genetic parameters and genetic gains for growth traits of two Eucalyptus urophylla populations in Zululand, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Gert J van den Berg --- Mondi Forests (Pty) Ltd, South Africa Steven D Verryn --- Creation Breeding Innovations cc, South Africa Paxie W Chirwa --- School of Natural and Agricultural Sciences, South Africa Francois van Deventer --- Mondi Forests (Pty) Ltd, South AfricaIn South Africa, Eucalyptus urophylla is an important species due to its disease tolerance to fungal diseases such as Crysoporthe austroafricana and the Coniothyrium sp. cankers. It is mainly planted as a parental species in a hybrid combination with E... -
Genetic variability of growth and wood chemical properties in a clonal population of Eucalyptus urophylla × Eucalyptus grandis in the Congo
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Garel Makouanzi --- Centre de Recherche sur la Durabilité et la Productivité des Plantations Industrielles (CRDPI), Republic of the Congo Gilles Chaix --- CIRAD, France Sophie Nourissier --- CIRAD, France Philippe Vigneron --- Centre de Recherche sur la Durabilité et la Productivité des Plantations Industrielles (CRDPI), Republic of the CongoThirty-four Eucalyptus urophylla × Eucalyptus grandis hybrids were evaluated with a view to selecting for improved growth and wood-quality traits for plantations in the Congo. Height, circumference at breast height and volume were measured at 12, 27, 37, 49 and... -
Time varying correlations and causalities between stock and foreign exchange markets: Evidence from China, Japan and Korea
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Young K. Park --- Business School, Korea Ki Beom Binh --- Department of Economics, Korea Suk-Joong Kim --- Discipline of Finance, AustraliaThis paper examines the time-varying relationship between the stock and the foreign exchange markets for China, Japan and Korea for the period July 2005 to November 2013. The cross-market relationship within each country differs among the three countries and varies... -
Assessment of genetic diversity in sorghum germplasm using agro-morphological traits
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Thulo Sejake --- , South Africa Nemera Shargie --- , South Africa Riann Christian --- , South Africa Toi Tsilo --- , South AfricaSorghum is one of the most important cereal crops grown in arid/semi-arid regions of the world. Despite its importance, sorghum production and productivity are constrained by the use of low yielding cultivars, which are susceptible to biotic and abiotic stresses... -
Integration among the BRICS stock markets: Filtering out global factors
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Ayesha Sayed --- University of Cape Town, South Africa Ailie Charteris --- University of Cape Town, South AfricaDespite the prominence of the BRICS bloc, little attention has been given to their stock market co-movement. This study investigates the time- and frequency-varying integration of the BRICS stock markets including new BRICS + members with active markets. We explore whether market... -
Long-term temporal patterns of human-carnivore conflict in the Chobe Enclave, northern Botswana
Item type: Journal Article • Journal: African Zoology • Authors: Gosiame Neo-Mahupeleng --- Botswana University of Agriculture and Natural Resources, Botswana Richard Fynn --- Okavango Research Institute, University of Botswana, Botswana Moseki Ronald Motsholapheko --- Okavango Research Institute, University of Botswana, Botswana Matshelo Makondo --- , Botswana Kaelo Nkile --- , Botswana Reneilwe Dipheko --- , Botswana Graham IH Kerley --- Centre for African Conservation Ecology, Nelson Mandela University, South AfricaIn some areas, human and carnivore livelihoods overlap causing human-carnivore conflict (HCC), hence there is a need for carnivore conservation efforts. The decline of most large carnivore populations are linked to HCC, primarily due to the killing of carnivores by...