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The impacts of management on nutrient cycling in plantation forestry in the southern Cape
Dissertation (D. Phil.) -- University of Stellenbosch, 1992.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613748915601409 |
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| access_status_str | Open Access |
| author | De Ronde, Cornelis |
| author2 | Donald, D. G. M. |
| author_browse | De Ronde, Cornelis Donald, D. G. M. |
| author_facet | Donald, D. G. M. De Ronde, Cornelis |
| author_sort | De Ronde, Cornelis |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Dissertation (D. Phil.) -- University of Stellenbosch, 1992. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/69802 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:41:04.390Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/69802 The impacts of management on nutrient cycling in plantation forestry in the southern Cape De Ronde, Cornelis Donald, D. G. M. Stock, W. D. Stellenbosch University. Faculty of AgriSciences. Dept. of Forest & Wood Science. Forest ecology -- South Africa -- Tsitsikamma Forest soils -- South Africa -- Tsitsikamma -- Fertilization Trees -- South Africa -- Tsitsikamma -- Nutrition Biogeochemical cycles -- South Africa -- Tsitsikamma Forest management -- South Africa -- Tsitsikamma Dissertations -- Forestry Dissertation (D. Phil.) -- University of Stellenbosch, 1992. The Tsitsikamma plateau forms one of the most important commercial plantation units in the Cape Forest Regions of Southern Africa and at this Pinus elliottii Engelm. var. elliottii and Pinus pinaster Aiton are the main species planted there. There is increasing evidence that Pinus radiata D. Don can provide higher mean annual timer increment on most sites but we still lack knowledge of site-tree relationships and nutrient cycling to quantify predicted response to fertilizer application in the area. The long-term response of P. radiata to P-application at time of planting on representative soil types of the Tsitsikamma was confirmed in this study and P-response models were developed for future use. Recommendation for the use of phosphate fertilization on duplex soils derived from TMS and soils derived from shales were formulated. For a better understanding of changes in N and P nutrient cycling, conceptual models were drawn up to illustrate nutrient movement and distribution before and after clearfelling, timber removal and slash burning. The objectives were to determine if significant changes in N and P budgets occurred and to consider whether these warranted adjustment of fertilization regimes. Various forest floor studies were conducted in the study area and elsewhere. Excessive accumulation of humans layeres was recorded under P. elliottii, P. taeda and P. pinaster. There is a significant accumulation of N and P in these forest floor layers that need adjustment by means of slash burning after clearfelling, to improve the nutrient balance in these stands. In contrast, there is no accumulation of humus under P. radiata even where tree growth is improved with P-fertilization. There is a clear indication that short term tree growth is improved by slash burning after clearfelling, but this advantage disappears with stand age. However, the cost effectiveness of slash burning compared to other methods of slash removal encourages its use on most sites of these heavy clay soils. With regard to timber removal, % N and P removed from the site is insignificant and amounts only to 2-5% of total budgets. N-volatilization was clear, but with relatively high N-budgets in the system, the increase in P levels in the topsoil as a result of slash burning is far important for future tree growth. Doctoral 2012-08-27T12:27:16Z 2012-08-27T12:27:16Z 1992 Thesis http://hdl.handle.net/10019.1/69802 en Stellenbosch University 226 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Forest ecology -- South Africa -- Tsitsikamma Forest soils -- South Africa -- Tsitsikamma -- Fertilization Trees -- South Africa -- Tsitsikamma -- Nutrition Biogeochemical cycles -- South Africa -- Tsitsikamma Forest management -- South Africa -- Tsitsikamma Dissertations -- Forestry De Ronde, Cornelis The impacts of management on nutrient cycling in plantation forestry in the southern Cape |
| title | The impacts of management on nutrient cycling in plantation forestry in the southern Cape |
| title_full | The impacts of management on nutrient cycling in plantation forestry in the southern Cape |
| title_fullStr | The impacts of management on nutrient cycling in plantation forestry in the southern Cape |
| title_full_unstemmed | The impacts of management on nutrient cycling in plantation forestry in the southern Cape |
| title_short | The impacts of management on nutrient cycling in plantation forestry in the southern Cape |
| title_sort | impacts of management on nutrient cycling in plantation forestry in the southern cape |
| topic | Forest ecology -- South Africa -- Tsitsikamma Forest soils -- South Africa -- Tsitsikamma -- Fertilization Trees -- South Africa -- Tsitsikamma -- Nutrition Biogeochemical cycles -- South Africa -- Tsitsikamma Forest management -- South Africa -- Tsitsikamma Dissertations -- Forestry |
| url | http://hdl.handle.net/10019.1/69802 |
| work_keys_str_mv | AT derondecornelis theimpactsofmanagementonnutrientcyclinginplantationforestryinthesoutherncape AT derondecornelis impactsofmanagementonnutrientcyclinginplantationforestryinthesoutherncape |