Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: " Nutrient release dynamics in decomposing leaf litter in two Mediterranean deciduous oak species. | Ann Sci For 1997 54 747-760 Elsevier Inra 747 Original article Nutrient release dynamics in decomposing leaf litter in two Mediterranean deciduous oak species I Santa Regina1 M Rapp2 A Martin1 JF Gallardo1 11RNA CSIC Cordel de Merinas 40. 37008 Salamanca Spain 2CEFE CNRS BP 5051 Montpellier 34033 France Received 16 December 1996 accepted 23 May 1997 Summary - The release and dynamics of macronutrients from decomposing leaf litter were determined for two deciduous oak species one in Spain Quercus pvrenaica growing on a humic Camhisol Sol hrun fore Stier and the other in France Q lanuginosa on a rendsic Leptosol Rendzme . The same processes were studied after leaf-litter exchanges between the French stand and a Spanish stand. Nylon litter bags 1 mm2 mesh containing 10 g of leaves were placed in five stands four in Spain and one in France and collected every 2 months when they were weighed and analysed for N p Ca Mg and K. The mean amount of nutrients in the decomposing leaves decreased over the 36-month period. The four Q pyrenaica stands were classified into two groups involving different nutrient release processes without any relation to yearly litterfall. For the Q lanuginosa stand the results obtained were similar to those for one of the Q pyrenaica groups. Similar nutrient release processes occurred in the litter-bags collected from native stands and after exchanges between the two species with a quick release of K followed by Mg and p. Higher Ca accumulation was noted for the Q pyrenaica litter as compared to Q lanuginosa litter. For N the results were very different between the two species and the two locations. litter decomposition litter bags nutrient release oak coppice Quercus pyrenaica I Q lanuginosa Resume - Dynamique de liberation des bioéléments de feuilles en decomposition de deux taillis méditerranéens à chênes caducifolies. La dynamique qualitative et quantitative de la perte d elements majeurs à partir de litières de feuilles en decomposition a été
