TAILIEUCHUNG - Báo cáo khoa học: "Differences in vegetation cover resulting from various methods of site preparation for pine plantations in South Africa"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Differences in vegetation cover resulting from various methods of site preparation for pine plantations in South Africa. | Ann Sci For 1995 52 365-374 Elsevier INRA 365 Original article Differences in vegetation cover resulting from various methods of site preparation for pine plantations in South Africa JB Zwolinski1 DGM Donald 2 School of Forestry Auburn University Auburn AL 36849-5418 USA 2 Faculty of Forestry University of Stellenbosch Stellenbosch South Africa Received 25 November 1993 accepted 5 October 1994 Summary Species composition height cover and biomass of vegetation were examined in response to forest regeneration methods applied in exotic tree plantations of Plnus radiata in South Africa. The experimental treatments involved 4 soil cultivation techniques pitting augering ripping and disking and 2 levels of weed control standard and intensive . Both species cover and composition were significantly affected by the experimental treatments. However the most important weed species remained common irrespective of the site preparation technique applied. More research is needed to find methods for selective control of weed species. tree plantations biodiversity competing vegetation weed control soil cultivation Resume Effet des methodes de preparation de site sur la couverture végétale dans les plantations de pin en Afrique du Sud. La diversite des espèces la hauteur la couverture et la biomasse végétale des plantations exotiques de Pinus radiata ont été examinees en fonction des methodes de regeneration de foret en Afrique du Sud. Les traitements expérimentaux comprennent 4 methodes de preparation du sol et 2 niveaux de contrôle des mauvaises herbes standard et intensif . Les traitements expérimentaux ont un effet sur la couverture et la diversite des espèces. Pourtant les espèces adventices les plus importantes restent présentes quelle que soit la technique utilise pour preparer le site. Des recherches supplémentaires sont requlses pour trouver des méthodes de contrôle selectif des espèces adventices. plantations forestieres diversite biologique competition végétale contrôle .

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