Hömberg, A; Obst, M; Knorr, KH; Kalbitz, K; Schaller, J: Increased Silicon Availability in Fen Peat Leads to a Release of Iron and Phosphate and Changes in the Composition of Dissolved Organic Matter, Geoderma (2020)
Abstract:
Abstract: Prior studies have shown that silicon (Si) increases the dissolution of iron (Fe) phosphates, releasing phosphorus (P) into the soil solution of fen peat and thereby changing the composition of organic matter (OM). We hypothesized that this processes occur in the following way: [i] high Si availability causes a mobilization of Fe phosphates, which, in turn, [ii] results in a higher concentration of P, Fe, and dissolved organic carbon, and [iii] changes the composition of organic matter. To this end, we conducted a laboratory experiment adding amorphous silica to fen peat and analyzed Fe mineralogy and carbon quality of the peat material by X-ray absorption spectroscopy (XAS). Under high Si availability, significantly higher concentrations of P and Fe were found in soil solution. Moreover, XAS data indicated a dissolution of Fe (II) phosphates and a change in the composition of available OM with decreasing contributions of carboxylic groups and quinones. We propose to explain the effects as follows: under high Si availability Fe (II) phosphates dissolve and OM rich in carboxylic groups are mobilized. As the nutrient availability in the soil solution increased, the degradation of oxidized components of the OM, such as quinones and carboxylic groups is enhanced.
Aktuelle Termine

BayCEER-Kolloquium:
Do. 09.02.2023
Rising Novelty in Ecosystems and Climates
Do. 16.02.2023
What is diversification and how should we study it?
Ökologisch-Botanischer Garten:
So. 05.02.2023
Führung | Gin: Diese Pflanzen stecken drin
So. 05.02.2023
Eröffnung | "Faszination Natur - Malereien und Zeichnungen" - Gemeinschaftsausstellung
So. 12.02.2023
Eigentümlich fremd: Wie Neophyten unsere Vorstellungen von Natur provozieren
Wetter Versuchsflächen
Luftdruck (356m): 975.5 hPa
Lufttemperatur: 2.8 °C
Niederschlag: 0.8 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 17m): 14.3 km/h
Wind (Max.): 27.4 km/h
Windrichtung: SW

...mehr
Globalstrahlung: -1 W/m²
Lufttemperatur: -0.1 °C
Niederschlag: 1.3 mm/24h
Wind (Höhe 32m): 2.2 km/h

...mehr
Diese Webseite verwendet Cookies. weitere Informationen