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- W2023130137 abstract "Fine earth accumulated within the weathering fissures of the coarse-soil fraction (particles > 2 mm), so called “stone-protected fine earth”, can provide a high short-term nutrient release by cation exchange. It is thus hypothesized that unweathered gneiss particles cannot provide plants with exchangeable-cation nutrients and that biological weathering is needed to include silicate-bound nutrients into biochemical cycles. In a microcosm experiment, ectomycorrhizal Norway spruce (Picea abies) seedlings were grown on either weathered or unweathered paragneiss coarse-soil fragments under natural hydraulic and climatic boundary conditions. A nutrient solution containing N, P, and K was added, however Mg and Ca could only be taken up from the coarse-soil substrate. Solutes in drainage were analyzed during the experiment; plant nutrient uptake was determined after the experiment ended. Solute dynamics depended on the weathering state of the substrates: unweathered gneiss showed high initial Mg and Ca fluxes that diminished strongly afterwards, whereas weathered gneiss showed a much more gradual and sustainable release of these cations. Patterns in dissolved organic C and sulfate drainage indicated that the internal pores of weathered gneiss fragments contained organic material most likely as a result of living spaces from microorganisms. Plant biomass did not differ between treatments, however Mg content was higher in seedlings grown on weathered gneiss. Nutrient budgets demonstrated that the “stonesphere” of weathered gneiss can act as a quasi-constant nutrient source whereas unweathered gneiss only provided high initial nutrients fluxes. In nutrient-depleted, acidified fine-earth environments, the coarse-soil fraction may therefore act as a retreat for nutrient-adsorbing tissues and as a buffer for nutrient shortages." @default.
- W2023130137 created "2016-06-24" @default.
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- W2023130137 date "2010-04-01" @default.
- W2023130137 modified "2023-10-12" @default.
- W2023130137 title "Effects of weathering state of coarse‐soil fragments on tree‐seedling nutrient uptake" @default.
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- W2023130137 doi "https://doi.org/10.1002/jpln.200800336" @default.
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