Pub Date : 2004-11-01DOI: 10.1080/20702620.2004.10431795
Doc Diek van der Zel
{"title":"Comment to Editor","authors":"Doc Diek van der Zel","doi":"10.1080/20702620.2004.10431795","DOIUrl":"https://doi.org/10.1080/20702620.2004.10431795","url":null,"abstract":"","PeriodicalId":228456,"journal":{"name":"The Southern African Forestry Journal","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125815819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-11-01DOI: 10.1080/10295925.1999.9631235
C. J. Steenkamp, M. Rooyen, N. Rooyen
ABSTRACT Core sampling in indigenous hardwood species is not a common practise. A field method LOUS developed to obtain a large enough sample without permanently damaging the trees. A Milwaukee Dymo 2,3 k W electric drill fitted with a 2-speed gearbox and powered by a generator was used. A core drill bit (100 mm x 350 mm) fitted with tungsten tips was designed to fit the electric drill. Core samples of mature trees of unknown age were collected according to height and diameter classes in the Kalahari Gemsbok National Park. This nondestructive method was found to be suitable for collecting large core samples of hardwood species.
对本土硬木树种进行岩心取样并不常见。LOUS开发了一种实地方法，以获得足够大的样本，而不会对树木造成永久性损害。使用密尔沃基Dymo 2,3 k W电钻，配有2速变速箱，由发电机供电。一个芯钻头(100毫米× 350毫米)配有钨头设计适合电钻。根据卡拉哈里大羚羊国家公园的高度和直径等级收集了年龄不详的成熟树木的核心样本。这种非破坏性的方法被发现适合于收集大的硬木种的核心样品。
{"title":"A non-destructive sampling method for dendrochronology in hardwood species","authors":"C. J. Steenkamp, M. Rooyen, N. Rooyen","doi":"10.1080/10295925.1999.9631235","DOIUrl":"https://doi.org/10.1080/10295925.1999.9631235","url":null,"abstract":"ABSTRACT Core sampling in indigenous hardwood species is not a common practise. A field method LOUS developed to obtain a large enough sample without permanently damaging the trees. A Milwaukee Dymo 2,3 k W electric drill fitted with a 2-speed gearbox and powered by a generator was used. A core drill bit (100 mm x 350 mm) fitted with tungsten tips was designed to fit the electric drill. Core samples of mature trees of unknown age were collected according to height and diameter classes in the Kalahari Gemsbok National Park. This nondestructive method was found to be suitable for collecting large core samples of hardwood species.","PeriodicalId":228456,"journal":{"name":"The Southern African Forestry Journal","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122706639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-11-01DOI: 10.1080/10295925.1999.9631244
C. Snedden, S. Verryn
SYNOPSIS This study was conducted as part of a joint venture between the tree improvement teams of Safcol and the CSIR to develop a breeding, production and conservation strategy for Pinus patula. The results of the investigation into genotype by environment interaction in two progeny trials of P. patula established over 5 sites in the highveld, middleveld and lowveld regions of Mpumalanga, South Africa are presented. The data from seven and eight-year old progeny trials were analysed and the genetic colt-elations and results of regression analysis are discussed in the light of breeding strategies und genotype by environment interaction. The heritabilities for growth rate were greater than those for stem and crown form on all sites. Heritabilities for volume ranged between 0,196 (middleveld site) and 0,246 (highveld site) in trial PF4008 1 09, and 0,256 and 0,400 in trial PF4011. The genetic correlations of growth between sites on the highveld (1733m altitude) and the lower altitude site (1152m) indicated...
{"title":"An investigation into the occurrence and nature of genotype by environment interaction in Pinus patula","authors":"C. Snedden, S. Verryn","doi":"10.1080/10295925.1999.9631244","DOIUrl":"https://doi.org/10.1080/10295925.1999.9631244","url":null,"abstract":"SYNOPSIS This study was conducted as part of a joint venture between the tree improvement teams of Safcol and the CSIR to develop a breeding, production and conservation strategy for Pinus patula. The results of the investigation into genotype by environment interaction in two progeny trials of P. patula established over 5 sites in the highveld, middleveld and lowveld regions of Mpumalanga, South Africa are presented. The data from seven and eight-year old progeny trials were analysed and the genetic colt-elations and results of regression analysis are discussed in the light of breeding strategies und genotype by environment interaction. The heritabilities for growth rate were greater than those for stem and crown form on all sites. Heritabilities for volume ranged between 0,196 (middleveld site) and 0,246 (highveld site) in trial PF4008 1 09, and 0,256 and 0,400 in trial PF4011. The genetic correlations of growth between sites on the highveld (1733m altitude) and the lower altitude site (1152m) indicated...","PeriodicalId":228456,"journal":{"name":"The Southern African Forestry Journal","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133257503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-11-01DOI: 10.1080/10295925.1999.9631246
C. Geldenhuys
{"title":"Field guide to the Acacias of Zimbabwe","authors":"C. Geldenhuys","doi":"10.1080/10295925.1999.9631246","DOIUrl":"https://doi.org/10.1080/10295925.1999.9631246","url":null,"abstract":"","PeriodicalId":228456,"journal":{"name":"The Southern African Forestry Journal","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127430905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-11-01DOI: 10.1080/10295925.1999.9631242
A. Colton, R. Laborde, S. Stander
SYNOPSIS During 1988/89 studies were done on the use of single mules and two-mule teams to slip tree lengths in pine thinning and clearfell operations in the Knysna and George area of the Southern Cape, with estimates given of the productivity and cost which can be expected. Actual production rates achieved by two-mule teams in the same area during 1999 are compared to the 1988/89 estimates and the production rates suggested by Zaremba (1976). The conclusion is that mules can still be a proposition for slipping timber by contractors, but contractors should be assisted with regard to the planning of the operation to obtain the optimum productivity.
{"title":"The use of mules in the harvesting of pine stands in the Southern Cape","authors":"A. Colton, R. Laborde, S. Stander","doi":"10.1080/10295925.1999.9631242","DOIUrl":"https://doi.org/10.1080/10295925.1999.9631242","url":null,"abstract":"SYNOPSIS During 1988/89 studies were done on the use of single mules and two-mule teams to slip tree lengths in pine thinning and clearfell operations in the Knysna and George area of the Southern Cape, with estimates given of the productivity and cost which can be expected. Actual production rates achieved by two-mule teams in the same area during 1999 are compared to the 1988/89 estimates and the production rates suggested by Zaremba (1976). The conclusion is that mules can still be a proposition for slipping timber by contractors, but contractors should be assisted with regard to the planning of the operation to obtain the optimum productivity.","PeriodicalId":228456,"journal":{"name":"The Southern African Forestry Journal","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132814439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-11-01DOI: 10.1080/10295925.1999.9631239
A. Colton, M. Brink
SYNOPSIS The study of seven articulated wheeled cable skidders at five different locations revealed that the optimism skidder pay load is not skidded. The average results of three similar Timberjack 380C skidders that formed part of tile study are discussed. The optimum payload of a skidder, whether a cable skidder or a grapple skidder, is the most important element determining its optimal use or productivity for a given stand of trees and therefore the cost of the extracted timber per cubic metre. Several methods of determining the optimum payload are discussed.
{"title":"Hitching optimal payloads increases skidder productivity","authors":"A. Colton, M. Brink","doi":"10.1080/10295925.1999.9631239","DOIUrl":"https://doi.org/10.1080/10295925.1999.9631239","url":null,"abstract":"SYNOPSIS The study of seven articulated wheeled cable skidders at five different locations revealed that the optimism skidder pay load is not skidded. The average results of three similar Timberjack 380C skidders that formed part of tile study are discussed. The optimum payload of a skidder, whether a cable skidder or a grapple skidder, is the most important element determining its optimal use or productivity for a given stand of trees and therefore the cost of the extracted timber per cubic metre. Several methods of determining the optimum payload are discussed.","PeriodicalId":228456,"journal":{"name":"The Southern African Forestry Journal","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131943995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-11-01DOI: 10.1080/10295925.1999.9631245
M. Marais, A. Swart
SYNOPSIS During a survey of plant nematodes in the Lottering Plantation, Eastern Cape Province, thirteen Pinus compartments, six indigenous forest and eight Fynbos areas were sampled. The nematode genera Helicotylenchus and Scutellonema were the most common whereas Criconema, Hemicycliophora, Mesocriconema, Tylenchorhynchus, Criconemoides, Paratylenchus and Xiphinema were found cit fewer localities. The genera Ogma, Paralongidorus and Pratylenchus mere each identified from a single locality. A number of nematode I plant associations are recorded for the first time in South Africa.
{"title":"Plant nematodes in the Lottering Plantation, Eastern Cape Province","authors":"M. Marais, A. Swart","doi":"10.1080/10295925.1999.9631245","DOIUrl":"https://doi.org/10.1080/10295925.1999.9631245","url":null,"abstract":"SYNOPSIS During a survey of plant nematodes in the Lottering Plantation, Eastern Cape Province, thirteen Pinus compartments, six indigenous forest and eight Fynbos areas were sampled. The nematode genera Helicotylenchus and Scutellonema were the most common whereas Criconema, Hemicycliophora, Mesocriconema, Tylenchorhynchus, Criconemoides, Paratylenchus and Xiphinema were found cit fewer localities. The genera Ogma, Paralongidorus and Pratylenchus mere each identified from a single locality. A number of nematode I plant associations are recorded for the first time in South Africa.","PeriodicalId":228456,"journal":{"name":"The Southern African Forestry Journal","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123515181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-11-01DOI: 10.1080/10295925.1999.9631241
A. Muneri, W. Leggate, G. Palmer
SYMMARY To assess the utility of the CIRAD-Fort% growth strain gauge for estimating stein growth stress, the relationship of longitudinal growth strain (LGS) with log-end splitting, sawn timber distortion and other tree and wood properties was studied in 23 ten-year-old Eucalyptus cloeziana trees. The CIRAD-Foret growth strain gauge appears to be useful as a means of predicting sawn timber distortion in young E. cloeziana trees. LGS correlated well with bow and spring and accounted for 50 and 30% of the respective total variation. The relationships of LGS with log end splitting, wood density, tree diameter and height were weak. However, distinct differences in wood density and sawtimber distortion were observed between trees with low and high strain. Trees with high growth strain were generally smaller with wood of significantly higher basic density and bow. Sampling position around the stem was not important and LGS increased with tree height.
{"title":"Relationships between surface growth strain and some tree, wood and sawn timber characteristics of Eucalyptus cloeziana","authors":"A. Muneri, W. Leggate, G. Palmer","doi":"10.1080/10295925.1999.9631241","DOIUrl":"https://doi.org/10.1080/10295925.1999.9631241","url":null,"abstract":"SYMMARY To assess the utility of the CIRAD-Fort% growth strain gauge for estimating stein growth stress, the relationship of longitudinal growth strain (LGS) with log-end splitting, sawn timber distortion and other tree and wood properties was studied in 23 ten-year-old Eucalyptus cloeziana trees. The CIRAD-Foret growth strain gauge appears to be useful as a means of predicting sawn timber distortion in young E. cloeziana trees. LGS correlated well with bow and spring and accounted for 50 and 30% of the respective total variation. The relationships of LGS with log end splitting, wood density, tree diameter and height were weak. However, distinct differences in wood density and sawtimber distortion were observed between trees with low and high strain. Trees with high growth strain were generally smaller with wood of significantly higher basic density and bow. Sampling position around the stem was not important and LGS increased with tree height.","PeriodicalId":228456,"journal":{"name":"The Southern African Forestry Journal","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127690453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-11-01DOI: 10.1080/10295925.1999.9631236
T. Stanger, M. Shaw, R. Braunstein, D. Nikles
SYNOPSIS The interspecific hybrid between P. elliottii var. elliottii and P. caribaea var. hondurensis has recently been accepted for planting operationally as an alternative to P. elliottii by Sappi in South Africa. Some concerns have been expressed as to the suitability of the hybrid for the production of pulpwood; these stein from the observed inferiority of P. caribaea var. hondurensis, one of tile parents of this hybrid, as a source of pulpwood in South Africa. As part of a collaborative project with the Queensland Forestry Research Institute (QFRI) in Australia, who felled and supplied chips from 4 individual trees of a suitable age of each of 4 families of each taxon. The kraft pulp yield and pulp properties of P. elliottii var. elliottii and the P. elliottii x P. caribaea var. hondurensis hybrid were compared using laboratory scale pulping.
最近，南非的Sappi已经接受了elliottii var. elliottii和P. caribaea var. hondurensis的种间杂交作为elliottii的替代品进行种植。有人对这种杂交植物是否适合生产纸浆木表示了一些关切;这些原因是由于观察到作为南非纸浆木材来源的P. caribaea var. hondurensis(该杂交品种的亲本之一)的劣等性。作为与澳大利亚昆士兰林业研究所(QFRI)合作项目的一部分，他从每个分类单元的4个科的4棵合适年龄的树中砍伐并提供了木片。采用室内规模制浆的方法，比较了不同品种的牛皮浆得率和牛皮浆性能。
{"title":"A Comparison of the kraft pulp properties of P. elliottii and the P. elliottii x P. caribaea var. hondurensis hybrid grown in Queensland, Australia","authors":"T. Stanger, M. Shaw, R. Braunstein, D. Nikles","doi":"10.1080/10295925.1999.9631236","DOIUrl":"https://doi.org/10.1080/10295925.1999.9631236","url":null,"abstract":"SYNOPSIS The interspecific hybrid between P. elliottii var. elliottii and P. caribaea var. hondurensis has recently been accepted for planting operationally as an alternative to P. elliottii by Sappi in South Africa. Some concerns have been expressed as to the suitability of the hybrid for the production of pulpwood; these stein from the observed inferiority of P. caribaea var. hondurensis, one of tile parents of this hybrid, as a source of pulpwood in South Africa. As part of a collaborative project with the Queensland Forestry Research Institute (QFRI) in Australia, who felled and supplied chips from 4 individual trees of a suitable age of each of 4 families of each taxon. The kraft pulp yield and pulp properties of P. elliottii var. elliottii and the P. elliottii x P. caribaea var. hondurensis hybrid were compared using laboratory scale pulping.","PeriodicalId":228456,"journal":{"name":"The Southern African Forestry Journal","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122736529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-11-01DOI: 10.1080/10295925.1999.9631240
Neeraj M. Dharamraj, W. Gaum, A. Hildebrand
SYNOPSIS Mine residue soils have been the cause of barren landscapes and due to its toxic nature, these soils have proved difficult in establishing any form of vegetation. A selection of indigenous tree species mainly used for the establishment of indigenous forest stands, improve the aesthetics of the site and bind the mine residue soil. These were planted in April 1997 in Johannesburg, South Africa and monitored over a thirteen month period. This preliminary study on mine residue soil compared the effect of the addition of inorganic fertiliser, compost and inorganic fertiliser and compost together with slow release fertiliser tablets to this soil. Fertiliser, 2:3:2(30) was applied to each tree in all three treatments every six weeks. Acacia karroo and Acacia caffra showed a significant difference in average tree height on the soils treated with compost and inorganic fertiliser when compared to the other trees.
{"title":"An investigation into the establishment of indigenous trees on treated mine residue soils in South Africa","authors":"Neeraj M. Dharamraj, W. Gaum, A. Hildebrand","doi":"10.1080/10295925.1999.9631240","DOIUrl":"https://doi.org/10.1080/10295925.1999.9631240","url":null,"abstract":"SYNOPSIS Mine residue soils have been the cause of barren landscapes and due to its toxic nature, these soils have proved difficult in establishing any form of vegetation. A selection of indigenous tree species mainly used for the establishment of indigenous forest stands, improve the aesthetics of the site and bind the mine residue soil. These were planted in April 1997 in Johannesburg, South Africa and monitored over a thirteen month period. This preliminary study on mine residue soil compared the effect of the addition of inorganic fertiliser, compost and inorganic fertiliser and compost together with slow release fertiliser tablets to this soil. Fertiliser, 2:3:2(30) was applied to each tree in all three treatments every six weeks. Acacia karroo and Acacia caffra showed a significant difference in average tree height on the soils treated with compost and inorganic fertiliser when compared to the other trees.","PeriodicalId":228456,"journal":{"name":"The Southern African Forestry Journal","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132049730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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