tailieunhanh - Báo cáo khoa học: Nutrient cycling in deciduous forest ecosystems of the Sierra de Gata mountains: nutrient supplies to the soil through both litter and throughfall

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Nutrient cycling in deciduous forest ecosystems of the Sierra de Gata mountains: nutrient supplies to the soil through both litter and throughfall. | Ann. Sci. For. 55 1998 771-784 Inra Elsevier Paris 771 Original article Nutrient cycling in deciduous forest ecosystems of the Sierra de Gata mountains nutrient supplies to the soil through both litter and throughfall Juan F. Gallardo3 Alejandro Martinb Gerardo Morenoa Ignacio Santa Reginaa . Aptdo. 257 Salamanca 37071 Spain bArea de Edafologia Facultad de Farmacia Salamanca 37080 Spain Received 2 September 1997 accepted 17 October 1997 Abstract - The present work fits into a general study on nutrient cycling in four Quercus pyrenaica oak forests and one Castanea sativa chestnut coppice located in the Sierra de Gata mountains Central System western Spain . The work consists of an estimation of bioelcment supplies to the soil by the litter of these species and by throughfall from the canopy with a view to defining their role in the soil and more generally in ecosystem bioelement dynamics. It is concluded that the greatest differences between the oak stands and the chestnut coppice lie in the fact that in the latter ecosystem potentially more N p K Mg Na and Mn return through the litter owing to greater production in the chestnut coppice and or root uptake . Additionally the relative importance of some bioelements N p K and Mn in the chestnut coppice is different from that of the oak forests. It is also possible to differentiate three groups of bioelements 1 those that potentially return almost exclusively through the litter C and N 2 those for which both litter and throughfall must be taken into account to determine the potential return of bioelements Ca Mg p K Fe and Mn and 3 those that return almost exclusively through canopy leaching Na Cu and Zn . Despite this on attempting to calculate the actual minimum annual returns the three groups must be reduced to two bioelements that almost exclusively return by throughfall Na Cu and Zn and bioelements that return through litter decay and canopy leaching. Exceptionally Fe behaves in a special way in the sense .