Honigeinlagerung

Der Wassergehalt des von den Pflanzen produzierten Nektars kann variieren. Um seine Konservierung in den Waben zu gewährleisten, darf er nicht gären. Deshalb wird er von den Bienen in Honig umgewandelt, indem sie seinen Wassergehalt senken und folglich den Zuckergehalt erhöhen. Dies verhindert die Entwicklung der Mikroorganismen. In der Dunkelheit des Bienenstocks ist es schwierig, den Herstellungsprozess des Honigs zu beobachten. Aus diesem Grund ist er auch nur wenig erforscht. Um die Umwandlung von Nektar in Honig zu untersuchen, haben wir die Technik der Tomographie eingesetzt. Sie ermöglicht es, den Zuckergehalt des eingelagerten Nektars sehr präzise zu messen, ohne den Bienenstock öffnen zu müssen und das Bienenvolk zu stören.

Towards a global model for soil inorganic phosphorus dynamics: dependence of exchange kinetics and soil bioavailability on soil physicochemical properties.

Institutional Repository Agroscope

Wang YP., Huang Y., Augusto L., Goll D., Helfenstein J., Hou E.

Towards a global model for soil inorganic phosphorus dynamics: dependence of exchange kinetics and soil bioavailability on soil physicochemical properties.

Global Biogeochemical Cycles, 36, (2), 2022.

Link: Manuskript

Riassunto:

The representation of phosphorus cycling in global land models remains quite simplistic, particularly on soil inorganic phosphorus. For example, sorption and desorption remain unresolved and their dependence on soil physical and chemical properties is ignored. Empirical parameter values are usually based on expert knowledge or data from few sites with debatable global representativeness in most global land models. To overcome these issues, we compiled from data of inorganic soil phosphorus (P) fractions and calculated the fraction of added P remaining in soil solution over time of 147 soil samples to optimize three parameters in a model of soil inorganic P dynamics. The calibrated model performed well (r2>0.7 for 122 soil samples). Model parameters vary by several orders of magnitude, and correlate with soil P fractions of different inorganic pools, soil organic carbon and oxalate extractable metal oxide concentrations among the soil samples. The modelled bioavailability of soil P depends on, not only, the desorption rates of labile and sorbed pool, inorganic phosphorus fractions, the slope of P sorbed against solution P concentration, but also on the ability of biological uptake to deplete solution P concentration and the time scale. The model together with the empirical relationships of model parameters on soil properties can be used to quantify bioavailability of soil inorganic P on various timescale especially when coupled within global land models.

ISSN Print: 0886-6236
ISSN Online: 1944-9224
Digital Object Identifier (DOI): https://doi.org/10.1029/2021GB007061
ID pubblicazione (Codice web): 48948 Inviare via e-mail

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Honigeinlagerung

Towards a global model for soil inorganic phosphorus dynamics: dependence of exchange kinetics and soil bioavailability on soil physicochemical properties.