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Báo cáo khoa học: "Long-term decomposition process of leaf litter from Quercus pyrenaica forests across a rainfall gradient (Spanish central system)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Long-term decomposition process of leaf litter from Quercus pyrenaica forests across a rainfall gradient (Spanish central system). | Ann Sei For 1997 54. 191-202 Elsevier INRA 191 Original article Long-term decomposition process of leaf litter from Quercus pyrenaica forests across a rainfall gradient Spanish central system A Martin1 JF Gallardo2 I Santa Regina2 1 Aren lie Edafologia Facultad de Farmacia. Universidad de Salamanca 37080 Salamanca 2 CSIC Aptado 257. 37071 Salamanca. Spain Received 30 November 1995 accepted 1 April 1996 Summary - A long-term 3 years study has been made of the leaf-litter decomposition process in four forest ecosystems across a rainfall gradient. The soil organic contents comply with the factor of rainfall but this does not appear to affect the complete decomposition process decisively since the limiting factor is soil humidity. The rainfall distribution is similar for all the plots studied and the main differences are seen essentially in the amount of water received during the wet season in each case with sufficient humidity for leaf decomposition to progress . Thus leaf-litter decay is linked to the maintenance of soil humidity mineralization slowing down when the soil dries out and the effects of climate therefore predominating over the chemical characteristics of the material in the regulation of the decomposition process at least at short term . In this sense the Slimmer drought is the most unfavourable environmental factor in this type of climate. In advanced stages of decay the rate of weight loss becomes relatively independent of climate. The decomposition rates obtained by the litterbag procedure are lower than those calculated by litter production and permanent litter the reason for these differences is probably the limitation of the mesofaune activity in the litterbags. Leaf decomposition constants ranged from 0.33 on the plot with the highest rainfall to 0.47 on the driest plot corresponding to mean residence times of 2.0 to I. I years respectively. However each bioelement has a different residence time. leaf-litter decomposition forest ecosystems Quercus