Litter inputs and phosphatase activity affect the temporal variability of organic phosphorus in a tropical forest soil in the Central Amazon
| Autor: | Iain P. Hartley, Oscar J. Valverde-Barrantes, Laynara F. Lugli, Carlos A. Quesada, Karst J. Schaap, Nathielly Martins, Lucia Fuchslueger, Florian Hofhansl, Marcel R. Hoosbeek |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Bodemscheikunde en Chemische Bodemkwaliteit
010504 meteorology & atmospheric sciences Soil Science Context (language use) Plant Science 01 natural sciences Nutrient Phosphorus cycle Amazon 0105 earth and related environmental sciences 2. Zero hunger Abiotic component WIMEK Chemistry Soil organic matter Leaf litter 04 agricultural and veterinary sciences 15. Life on land Plant litter Agronomy 13. Climate action Soil water 040103 agronomy & agriculture Litter 0401 agriculture forestry and fisheries Hedley fractionation Soil Chemistry and Chemical Soil Quality Phosphatase activity Lowland tropical forest |
| Zdroj: | Plant and Soil, 469(1-2), 423-441 Plant and Soil Plant and Soil 469 (2021) 1-2 |
| ISSN: | 0032-079X |
| Popis: | Purpose The tropical phosphorus cycle and its relation to soil phosphorus (P) availability are a major uncertainty in projections of forest productivity. In highly weathered soils with low P concentrations, plant and microbial communities depend on abiotic and biotic processes to acquire P. We explored the seasonality and relative importance of drivers controlling the fluctuation of common P pools via processes such as litter production and decomposition, and soil phosphatase activity. Methods We analyzed intra-annual variation of tropical soil phosphorus pools using a modified Hedley sequential fractionation scheme. In addition, we measured litterfall, the mobilization of P from litter and soil extracellular phosphatase enzyme activity and tested their relation to fluctuations in P- fractions. Results Our results showed clear patterns of seasonal variability of soil P fractions during the year. We found that modeled P released during litter decomposition was positively related to change in organic P fractions, while net change in organic P fractions was negatively related to phosphatase activities in the top 5 cm. Conclusion We conclude that input of P by litter decomposition and potential soil extracellular phosphatase activity are the two main factors related to seasonal soil P fluctuations, and therefore the P economy in P impoverished soils. Organic soil P followed a clear seasonal pattern, indicating tight cycling of the nutrient, while reinforcing the importance of studying soil P as an integrated dynamic system in a tropical forest context. |
| Databáze: | OpenAIRE |
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