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https://repositorio.inpa.gov.br/handle/1/38224
Title: | Litter inputs and phosphatase activity affect the temporal variability of organic phosphorus in a tropical forest soil in the Central Amazon |
Authors: | Quesada, Carlos Alberto Nobre Lugli, Laynara F. Hartley, Iain P. Barrantes, Oscar J. Valverde Martins, Nathielly Pires Hofhansl, Florian Hoosbeek, Marcel R. Fuchslueger, Lucia Schaap, Karst J. |
Keywords: | Hedley fractionation Leaf litter |
Issue Date: | 2021 |
metadata.dc.publisher.journal: | Plant and Soil |
Abstract: | 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. © 2021, The Author(s). |
metadata.dc.identifier.doi: | 10.1007/s11104-021-05146-x |
Appears in Collections: | Artigos |
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File | Description | Size | Format | |
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Litter.pdf | 60,46 kB | Adobe PDF | View/Open |
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