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Báo cáo khoa học: " Nutrient release dynamics in decomposing leaf litter in two Mediterranean deciduous oak species"

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