Intensive, site-specific silviculture: Manipulating resource availability at establishment for improved stand productivity. A review of South African research

Toit, Ben du; Smith, C. W.; Little, Keith M.; Boreham, G. R.; Pallett, Robert N

doi:10.1016/j.foreco.2009.07.015

Cited by 62 publications

(25 citation statements)

References 46 publications

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“…While the greatest growth response is usually observed for potassium and phosphorus fertilizer application Laclau et al 2009;du Toit et al 2010), tree growth is generally more dependent on nitrogen (N) addition in Australia ). Nutrient budgets established over a full rotation, as well as modelling approaches, have shown that current silvicultural practices lead to higher N outputs than N inputs in most commercial plantations (Corbeels et al 2005;Laclau et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Introducing Acacia mangium trees in Eucalyptus grandis plantations: consequences for soil organic matter stocks and nitrogen mineralization

et al. 2011

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Background and aims Eucalyptus plantations cover 20 million hectares on highly weathered soils. Large amounts of nitrogen (N) exported during harvesting lead to concerns about their sustainability. Our goal was to assess the potential of introducing A. mangium trees in highly productive Eucalyptus plantations to enhance soil organic matter stocks and N availability. Methods A randomized block design was set up in a Brazilian Ferralsol soil to assess the effects of mono-specific Eucalyptus grandis (100E) and Acacia mangium (100A) stands and mixed plantations (50A:50E) on soil organic matter stocks and net N mineralization. Results A 6-year rotation of mono-specific A. mangium plantations led to carbon (C) and N stocks in the forest floor that were 44% lower and 86% higher than in pure E. grandis stands, respectively. Carbon and N stocks were not significantly different between the three treatments in the 0-15 cm soil layer. Field incubations conducted every 4 weeks for the two last years of the rotation estimated net soil N mineralization in 100A and 100E at 124 and 64 kg ha?1 yr?1, respectively. Nitrogen inputs to soil with litterfall were of the same order as net N mineralization. Conclusions Acacia mangium trees largely increased the turnover rate of N in the topsoil. Introducing A. mangium trees might improve mineral N availability in soils where commercial Eucalyptus plantations have been managed for a long time. (Résumé d'auteur

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Section: Introductionmentioning

confidence: 99%

Introducing Acacia mangium trees in Eucalyptus grandis plantations: consequences for soil organic matter stocks and nitrogen mineralization

et al. 2011

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“…FAO [34] considered 18 years suitable for E. saligna and E. grandis and 12 years for E. camaldulensis. Du Toit et al [47] found a 9 to 12 year rotation period to be optimal for E. macarthurii and 6 to 11 year for E. grandis under coppice management, and 18 to 52 years for timber uses.…”

Section: Analysis Of the Resultsmentioning

confidence: 99%

Comparison of the Growth of SixEucalyptusSpecies in Angola

Delgado-Matas

Pukkala

2011

International Journal of Forestry Research

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Eucalyptus species have been planted in Angola since the early twentieth century. −1 , resp.). Using X-ray analyses of increment cores, it was possible to study the temporal development of the stand characteristics. An analysis of the mean annual increment showed that the optimal rotation length for most of the studied eucalypts is around 22 years with the exception of E. resinifera, for which 12-15 years is the best. E. saligna had the highest maximum mean annual increment (MMAI) of 37 m 3 ha −1 attained at 22 years of age. E. grandis reached its MMAI of 25 m 3 haat 28 years. The results suggest that E. saligna is the most recommended Eucalyptus species for new plantations in Angola.

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“…This corresponded to all the initial silviculture land preparation trials that showed cultivation was beneficial during afforestation (planting of grassveld) but had no effect at re-establishment. According to du Toit et al (2010), surface ploughing for the establishment of the F1R (grasslands) site resulted in improved productivity because of nutrient mineralisation and the physical break-down of the dense root mat normally formed on the grassveld. Ripping or subsoiling after the F1R had shown no significant improvement in site productivity (du Toit et al 2010).…”

Section: Discussionmentioning

confidence: 99%

“…According to du Toit et al (2010), surface ploughing for the establishment of the F1R (grasslands) site resulted in improved productivity because of nutrient mineralisation and the physical break-down of the dense root mat normally formed on the grassveld. Ripping or subsoiling after the F1R had shown no significant improvement in site productivity (du Toit et al 2010). The application of lime had no significant difference in productivity between the control (slash retained) and lime treatments, similar to findings by Wall (2012).…”

Section: Discussionmentioning

confidence: 99%

The importance of harvest residue and fertiliser on productivity of Pinus patula across various sites in their first, second and third rotations, at Usutu Swaziland

Mavimbela

Crous

Morris³

et al. 2018

N.Z. j. of For. Sci.

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Background: Concern is growing about the future of forestry productivity due to intensive nutrient removal, as a result of different harvesting operations. This study aimed to determine the effects on forest productivity when using different slash-retention scenarios with the recommended amounts of mineral fertiliser in Usutu forest. Usutu is a plantation forest that grows mostly softwood where the predominant species is Pinus patula Schiede ex Schltdl. & Cham.Methods: The first trial series (F) comprised of one trial located in each of five forest blocks. It was established in 1971 and compared the effects of various site preparation scenarios (slash removal, slash retention and cultivation) on the early growth of Pinus patula for adjacent first (F1R) and second rotation (F2R) sites (i.e. grassveld and clearfelled first-rotation sites). The second (S) trial series was re-established in April 1991 on exactly the same position as the first trial series, and involved second (S2R) and third rotation (S3R) sites. Three main treatments, standard pitting through harvest residue (control); manual pitting after removal of harvest residue and forest floor (cleared); and manual pitting and broadcast application of dolomitic lime (2 t ha

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Intensive, site-specific silviculture: Manipulating resource availability at establishment for improved stand productivity. A review of South African research

Cited by 62 publications

References 46 publications

Introducing Acacia mangium trees in Eucalyptus grandis plantations: consequences for soil organic matter stocks and nitrogen mineralization

Introducing Acacia mangium trees in Eucalyptus grandis plantations: consequences for soil organic matter stocks and nitrogen mineralization

Comparison of the Growth of SixEucalyptusSpecies in Angola

The importance of harvest residue and fertiliser on productivity of Pinus patula across various sites in their first, second and third rotations, at Usutu Swaziland

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