Microbial reaction of secondary tropical forest soils to the addition of leaf litter |
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| Institution: | 1. Melbourne School of Land and Environment, The University of Melbourne, Victoria 3010, Australia;2. International Plant Nutrition Institute, 54 Florence Street, Horsham, Victoria 3400, Australia;3. Department of Environment and Primary Industries, Private Bag 260, Victoria 3401, Australia;4. Department of Agricultural Sciences, La Trobe University, Bundoora, Victoria 3086, Australia;1. Programme Ressources Forestières-CRRA/Sotuba, Institut d’Economie Rurale (IER), Rue Mohamed V, BP 258, Bamako, Mali;2. Department of Geosciences and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, 1958, Frederiksberg C, Denmark;1. Council for Scientific and Industrial Research (CSIR), P.O. Box 395, Pretoria 0001, South Africa;2. University of KwaZulu-Natal, Private Bag X 01, Scottsville 3209, South Africa;3. University of Limpopo, Private Bag X 1106, Sovenga 0727, South Africa;1. VU University, De Boelelaan 1085, 1081HV Amsterdam, The Netherlands;2. Universidade Federal do Amazonas (UFAM), Instituto de Educação, Agricultura e Ambiente – IEAA, Rua 29 de Agosto, 786 Bairro Centro, CEP: 69800-000, Humaitá, AM, Brazil;3. Alterra, Droevendaalsesteeg 3, Wageningen, The Netherlands;4. Biogeochemistry Department, Max Planck Institute for Chemistry, Hahn-Meitner-Weg 1, 55128 Mainz, Germany;5. Instituto Nacional de Pesquisas da Amazônia (INPA), Av. André Araújo, 2936 Campus 2, CEP: 69060-020, Manaus, AM, Brazil |
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| Abstract: | Two soils from a secondary tropical forest at La Union, Philippines, predominantly vegetated with Swietenia marcrophylla and Gmelina arborea were amended with different leaf litter types (Eucalyptus camaldulensis, S. macrophylla, G. arborea, and Calliandra calothyrsus) and incubated in the laboratory for 49 days at 25 °C. The experiment was carried out to elucidate the reasons for a low ATP-to-microbial biomass C ratio and a high microbial biomass C-to-N ratio. This has been measured repeatedly in tropical forest soils. In the non-amended soils, the microbial biomass C-to-N ratio of 12.1 exceeded the soil organic C-to-total N ratio of 11, while the ergosterol-to-microbial biomass C ratio of 0.14% and the ATP-to-microbial biomass C ratio of 4.1 μmol g?1 were both low. At the end of the incubation, the addition of the different leaf litter types led generally to a decrease in the microbial biomass C-to-N ratio and to an increase in the ATP-to-microbial biomass C ratio, adenylate energy charge (AEC) and especially to an increase in the ergosterol-to-microbial biomass C ratio. The increase in the ATP-to-microbial biomass C ratio and the decrease in the microbial biomass C-to-N ratio were positively related to the N concentration in the leaf litter, the increase in the ergosterol-to-microbial biomass ratio negatively. The reasons for a low ATP-to-microbial biomass C ratio and a high microbial biomass C-to-N ratio are P deficiency and probably a reduced access of soil microorganisms to N containing organic components at low soil organic C levels. |
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