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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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Uptake of organic phosphorus by Arbuscular Mycorrhizal Red Clover

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pedosphere 2002年第2期12卷 103-110页

作者： SONGYONGCHUN p.CHRISTIE DepartmentofplantNutrition CollegeofAgriculturalResourcesandEnvironmentalSciencesChinaAgriculturalUniversityBeijing100094（China） DepartmentofAgriculturalandEnvironmentalScience The

The capacities of two arbuscular mycorrhizal (AM) fungi, Glomusmosseae and Glomus versiforme, to mineralize added organic p werestudied in a sterilized clacareous soil. Mycorrhizal (inoculated witheither of the AM fungi) and non-mycorrhizal red clover (Trifoliumpratense L.) plants were grown for eight weeks in pots with upperroot, central hyphal and lower soil compartments. The hyphal and soilcompartments received either organic p (as Na-phytte) or inorganic p(as KH_2pO_4) at the rate of 50 mg p kg^-1. No p was added to theroot compartments.

关键词： arbuscular mcorrhiza organic p p uptake red clover

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Changes in Olsen p in Relation to p Balance in Contrasting Agricultural Soils

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pedosphere 2016年第5期26卷 636-642页

作者： Isabel DIAZ Jose TORRENT Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos Escuela Tdcnica Superior de Ingeniería Agronómica(ETSIA)Universidad de SevillaCtra de Utrera km 141013 Sevilla(Spain) Departamento de Agronomia Universidad de CordobaEdificio C4Campus de Rabanales14071 Cordoba(Spain)

Maintaining soil phosphorus （p） at adequate levels for plant growth requires assessing how the long-term p balance （viz., the difference between p inputs and outputs） results in changes in soil test p. The hypothesis that routinely measured soil properties can help predict the conversion factor of p balance into Olsen p was tested at 39 sites in agricultural areas of the Mediterranean region in Spair~. A set of soil samples from each site was analyzed for Olsen p, inorganic p （p extracted using 0.5 mol L-1 H2SO4）, pseudototal p （p extracted using 0.5 mol L-1 H2SO4 following ignition at 550 ~C）, and organic p （the difference between pseudototal p and inorganic p）. organic and Olsen p were uncorrelated in most of the 39 soil sets, which suggests that organic p content changed little with p inputs and outputs. The slopes of the regression lines of Olsen p against pseudototal and inorganic p, which were used as two different measures of the conversion factor, ranged widely （from 0.03 to 0.25 approximately）, with their average values （about 0.10） being similar to those found in long-term experiments conducted in temperate areas. Neither conversion factor was significantly correlated with any routinely measured soil property; however, the conversion factor for inorganic p was significantly lower for calcareous soils than for noncalcareous soils. Our negative results suggest the need to isolate the influence of soil properties from that of management systems and environmental factors relating to p dynamics in future studies.

关键词： calcareous soils conversion factor inorganic p noncalcareous soils organic p pseudototal p soil property soil test p

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Soil phosphorus Fractions Change in Winter in a Corn-Soybean Rotation with Tillage and phosphorus Fertilization

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pedosphere 2015年第1期25卷 1-11页

作者： Yi-Chao SHI Noura ZIADI Aimé J.MESSIGA Roger LALANDE HU Zheng-Yi Soils and Crops Research and Development Centre Agriculture and Agri-Food Canada (AAFC) College of Resources and Environment University of Chinese Academy of Sciences Environmental and Resource Studies program Trent University

Determining how agricultural management practices affect soil phosphorus(p) over the winter may further our understanding of the soil p cycle under specific environmental conditions in eastern Canada. This study assessed changes over winter for soil p fractions and other selected chemical properties as affected by tillage and p fertilization. In 1992, a long-term corn(Zea mays L.) and soybean(Glycine max L.) rotational experiment was established in the province of Quebec, Canada. Soil samples(0–15 cm) were collected in fall 2001 and 2007 after a soybean harvest, and in the following spring 2002 and 2008 before corn seeding, in main plots under moldboard plow and no-till managements and selected subplots fertilized with 0, 17.5, or 35 kg p ha-1and 160 kg N ha-1. Soil samples were analyzed for p fractions and other chemical properties to assess changes over winter for 2001–2002 and 2007–2008. Changes over winter of all soil p fractions were significant for the two periods, indicating the occurrence of soil p transformation and movement over winter. The Mehlich-3-extractable Fe, Al, Ca, and Mg decreased during the two studied periods. Tillage had no significant effect on all soil p fractions. The resin-extractable p in 2001–2002 and Na HCO3-extractable inorganic p and Na OH-extractable organic p during the two winters were significantly increased under p fertilization. This study demonstrated that p in cultivated soils changed during winter as a result of changes in labile p fractions possibly due to the solubilization of residual fertilizer p combined with environmental factors.

关键词： agricultural management practices environmental factors inorganic p labile p organic p

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