Biological processes dominate phosphorus dynamics under low phosphorus availability in organic horizons of temperate forest soils
| Autor: | Éva Mészáros, Chiara Pistocchi, Federica Tamburini, Emmanuel Frossard, Else K. Bünemann |
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| Přispěvatelé: | Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Institute of Agricultural Sciences, Ecole Polytechnique Fédérale de Zurich, Research Institute of Organic Agriculture - Forschungsinstitut für biologischen Landbau (FiBL), Swiss National Science Foundation [SNF project 200021E-149130]. |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Mineralization
010504 meteorology & atmospheric sciences Isotopic dilution Soil Science Radioisotope tracing Sequential extraction 33P Litter addition 01 natural sciences Microbiology Soil quality [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDV.BV]Life Sciences [q-bio]/Vegetal Biology 0105 earth and related environmental sciences 2. Zero hunger Abiotic component Chemistry Soil organic matter Temperate forest 04 agricultural and veterinary sciences Mineralization (soil science) 15. Life on land Plant litter P-33 Microbial population biology Environmental chemistry Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries |
| Zdroj: | Soil Biology and Biochemistry Soil Biology and Biochemistry, Elsevier, 2018, 126, pp.64-75. ⟨10.1016/j.soilbio.2018.08.013⟩ Soil Biology and Biochemistry, 126 |
| ISSN: | 0038-0717 |
| Popis: | International audience; Understanding the mechanisms underlying phosphorus (P) availability is important to predict forest productivity in a changing environment. We quantified P fluxes and traced P from plant litter into inorganic and organic soil P pools in organic horizons from two contrasting temperate forest soils with low and high inorganic P availability, respectively. We incubated the two organic horizons with and without litter after labelling the soil solution with P-33 and performed sequential extractions at several time points in order to trace P dynamics in labile (water extractable, available and microbial P) and non-labile (non-living organic P, P bound to iron and aluminium and P bound to calcium) pools. Under low P availability, P fluxes were dominated by gross P mineralization, and microbial P immobilization accounted for up to 95% of gross P mineralization. Additionally, labile P in plant litter was rapidly incorporated into microbial P and only a small fraction ended up in the non-labile inorganic P pools. In contrast, P fluxes under high P availability were dominated by abiotic processes, particularly by fast (within 10 days) sorption/desorption reactions between the available P and the P bound to aluminium. These findings support the hypothesis that under low P availability biological processes control P fluxes. The observed tight cycling of P, with little efflux due to net P mineralization, suggests that the mineralization of organic P is driven by microbial P demand, and that the microbial community could compete with plants for available P. |
| Databáze: | OpenAIRE |
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