tailieunhanh - Báo cáo khoa học: "Effects of lime-induced differences in site on fine roots of oak"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Effects of lime-induced differences in site on fine roots of oak. | 599 Ann. For. Sci. 56 1999 599-606 Inra Elsevier Paris Original article Effects of lime-induced differences in site fertility on fine roots of oak Mark R. Bakker Claude Nys Equipe cycles biogéochimiques Inra Nancy 54280 Champenoux France Received 9 March 1999 accepted 9 June 1999 Abstract - This study aims at evaluating the effects of lime-induced differences in site fertility on fine roots. Lime was applied to ten oak Que reus petraea and Q. robur stands on acidic soils with low base saturation 1-27 years before fine root sampling. The soil exchangeable nutrient pool fine root and foliar composition all showed deficient levels for at least a number of elements. Liming enhanced fine root biomass both in topsoil and in deeper horizons and overall fertility and nutrition were improved for Ca and Mg but not for K and p. Thus liming in moderate doses on acidic sites showing nutrient deficiencies may stimulate the absorbing capacity of the tree root system by enlarging fine root standing crop and thereby improving uptake of mineral nutrients and stand growth. However one should bear in mind that resolving a deficiency for some elements can create less favourable conditions for others. 1999 Editions scientifiques et medicales Elsevier SAS. fine roots liming mineral nutrition Quercus I soil Resume - Consequences après amendement d un changement de fertilite sur les racines fines de chêne. Cette étude évalue 1 effet des changements induits au niveau de la fertilite du sol par des amendements calciques et ses consequences sur les racines fines. Les amendements calciques ont été appliques dans dix peuplements de chêne Quercus petraea et robur sur des sols acides et désaturés entre 1 et 27 ans avant Téchantillonnage des racines fines. Ces dix peuplements montraient des deficiences nutritives déterminées par le niveau des stocks d elements échangeables la composition minérale des racines et des feuilles. Les amendements ont augmenté la biomasse racinaire en surface et en .

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