tailieunhanh - Báo cáo lâm nghiệp:"Growth, damage and net nitrogen uptake in Picea abies (L.) Karst. seedlings, effects of site preparation and fertilisation"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"Growth, damage and net nitrogen uptake in Picea abies (L.) Karst. seedlings, effects of site preparation and fertilisation" | 657 Ann. For. Sci. 60 2003 657-666 INRA EDP Sciences 2004 DOI forest 2003058 Original article Growth damage and net nitrogen uptake in Picea abies L. Karst. seedlings effects of site preparation and fertilisation Fredrik Nordborg Urban Nilsson Swedish University of Agricultural Sciences Southern Swedish Forest Research Centre PO Box 49 23053 Alnarp Sweden Received 24 June 2002 accepted 17 February 203 Abstract - The effects of four different soil treatments and two different fertilising regimes on growth nitrogen uptake and damage of planted Picea abies seedlings were studied on abandoned farmland in southern Sweden. Intensive site preparation . deep soil cultivation of the whole plot area effectively managed to increase seedling growth and reduce seedling damage during establishment. Inversion of the soil profile in patches and field vegetation control with herbicides did not increase seedling growth and survival as effectively as complete deep soil cultivation but had both higher growth and survival than the untreated control. Seedling nitrogen uptake was higher in the cultivated treatments and nitrogen uptake was positively correlated to fast root development during the first growing season but the nitrogen uptake was not correlated to nitrogen net mineralisation. Fertilising increased the amounts of field vegetation. Moreover seedling damage by voles was correlated to the amount of field vegetation and seedling damage lowered the seedling growth. The risk for nitrogen leaching is probably higher in complete deep soil cultivation than in other treatments. nitrogen mineralisation Norway spruce root growth seedling establishment nitrogen leaching Résumé - Effets de travaux de preparation de sol et de la fertilisation sur la croissance la frequence de dommages et le prélèvement net d azote des plants de Picea abies L. Karst. On a étudié les effets de quatre types de preparation du sol et de deux regimes de fertilisation sur la croissance la consommation

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