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.

Medium management intensity supports largest topsoil organic carbon stocks in mountain grassland.

Institutional Repository Agroscope

Volk M., Heinz M. M., Giger R., Schneider M.

Medium management intensity supports largest topsoil organic carbon stocks in mountain grassland.

Archives of Agronomy and Soil Science, 71, (1), 2025, 1-15.

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Abstract:

Grassland soil organic carbon (SOC) stock constitutes the largest terrestrial greenhouse gas sink. Therefore, we compared the effect of three common mountain grassland management regimes on the SOC stock in the inner-alpine Lower Engadine valley. We hypothesized that higher management intensity (MI), including higher manure loads and higher cutting frequency, increases plant productivity and organic matter (OM) input to the soil, providing the substrate for a higher SOC stock. In our study, we found that the SOC stock (0–20 cm depth) in low MI plots was only 73.1 ± 3.99 t C ha−1 and much larger (+23%) in medium MI grassland plots with 89.6 ± 4.2 t C ha−1. Surprisingly, in high MI plots, the SOC stock was also comparatively small with 78.7 ± 5.4 t C ha−1 (+8% compared to low MI). Soil pH, C/N ratio, clay content and farmyard manure were no drivers of SOC stock differences. We conclude that, compared to medium MI, in the high MI grasslands, the organic C input from high plant productivity is overcompensated by antagonistic management effects, favoring higher OM decomposition rates. Accordingly, more fertilization and frequent cutting, leading to higher grassland yields, are not necessarily beneficial for SOC sequestration.

ISSN Print: 0365-0340
ISSN Online: 1476-3567
Digital Object Identifier (DOI): https://doi.org/10.1080/03650340.2025.2490082
Publication-ID (Web Code): 59271 Sending by e-mail

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Honigeinlagerung

Medium management intensity supports largest topsoil organic carbon stocks in mountain grassland.