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Organic matter quality of forest floor as a driver of C and P dynamics in acacia and eucalypt plantations established on a Ferralic Arenosols, Congo

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Forest Ecosystems 2020年第3期7卷 511-525页

作者： Lydie-Stella Koutika Lorenzo Cafiero Annamaria Bevivino Agustín Merino Research Centre on the Durability and the Productivity of Industrial Plantations(CRDPI) Av.Ma Loango Moe Poaty BP 1291Pointe-NoireRepublic of the Congo Department for Sustainability Biotechnologies and Agroindustry DivisionLaboratory for AgriFood SustainabilityQuality and SafetyItalian National Agency for New TechnologiesEnergy and Sustainable Economic DevelopmentENEACasaccia Research CentreVia Anguillarese301-00123RomeItaly Department for Sustainability Division Resource EfficiencyLaboratory Technologies for the ReuseRecyclingRecovery and valorisation of Waste and MaterialsItalian National Agency for New TechnologiesEnergy and Sustainable Economic DevelopmentENEACasaccia Research Centre00123RomeItaly Department of Soil Science and Agricultural Chemistry University of Santiago de Compostela2702LugoSpain

Background: Land-use change and forest management may alter soil organic matter(SOM) and nutrient dynamics,due in part to alterations in litter input and quality. Acacia was introduced in eucalypt plantations established in the Congolese coastal plains to improve soil fertility and tree growth. Eucalypt trees were expected to benefit from N2 fixed by acacia. However, some indicators suggest a perturbation in SOM and P dynamics might affect the sustainability of the system in the medium and long term. In tropical environments, most of the nutrient processes are determined by the high rates of organic matter(OM) mineralization. Therefore, SOM stability might play a crucial role in regulating soil-plant processes. In spite of this, the relationship between SOM quality, C and other nutrient dynamics are not well understood. In the present study, OM quality and P forms in forest floor and soil were investigated to get more insight on the C and P dynamics useful to sustainable management of forest ***: Thermal analysis(differential scanning calorimetry(DSC) and thermogravimetry(TGA)) and nuclear magnetic resonance(solid state13 C CPMASS and NMR and31 P-NMR) spectroscopy have been applied to partially decomposed forest floor and soils of pure acacia and eucalypt, and mixed-species acacia-eucalypt ***: Thermal analysis and13 C NMR analysis revealed a more advanced stage of humification in forest floor of acacia-eucalypt stands, suggesting a greater microbial activity in its litter. SOM were related to the OM recalcitrance of the forest floor, indicating this higher microbial activity of the forest floor in this stand might be favouring the incorporation of C into the mineral ***: In relation with the fast mineralization in this environment, highly soluble orthophosphate was the dominant P form in both forest floor and soils. However, the mixed-species forest stands immobilized greater P in organic forms, preventing the P losses by lea

关键词： Mixed-species plantations Soil chemical stability Organic P Forest ecosystems potential climate change mitigation

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