Brændholt, Andreas

Callesen, Ingeborg

Larsen, Klaus Steenberg

Magnussen, Andreas

Schrumpf, Marion

Vesterdal, Lars

Vorenhout, Michel

English

Copenhagen University Research Information System

u n i ve r s i t y  o f  co pe n h ag e n  Københavns UniversitetVariation in SOC stocks as explained by soil forming factors at the ICOS site Sorø,DenmarkCallesen, Ingeborg; Brændholt, Andreas; Schrumpf, Marion; Magnussen, Andreas;Vorenhout, Michel; Vesterdal, Lars; Larsen, Klaus SteenbergPublished in:Geophysical Research AbstractsPublication date:2018Document versionPublisher's PDF, also known as Version of recordDocument license:CC BYCitation for published version (APA):Callesen, I., Brændholt, A., Schrumpf, M., Magnussen, A., Vorenhout, M., Vesterdal, L., & Larsen, K. S. (2018).Variation in SOC stocks as explained by soil forming factors at the ICOS site Sorø, Denmark. GeophysicalResearch Abstracts, 20.Download date: 03. Feb. 2020Geophysical Research AbstractsVol. 20, EGU2018-PREVIEW, 2018EGU General Assembly 2018© Author(s) 2018. CC Attribution 4.0 license.Variation in SOC stocks as explained by soil forming factors at the ICOSsite Sorø, DenmarkIngeborg Callesen (1), Andreas Brændholt (2), Marion Schrumpf (3), Andreas Magnussen (4), Michel Vorenhout(5), Lars Vesterdal (1), and Klaus Steenberg Larsen (1)(1) University of Copenhagen, Department of Geosciences and Natural Resource Management, Denmark (ica@ign.ku.dk), (2)Technical University of Denmark, DTU Environment, DK-2800 Lyngby, Denmark, (3) Department BiogeochemicalIntegration, Max Planck Institute for Biogeochemistry, Jena, Germany, (4) Cperf Aps, DK-2840 Holte, Denmark, (5)Freshwater and Marine Ecology (IBED-FAME), University of Amsterdam, the NetherlandsWithin a framework developed from Jenny’s (1941) conceptual model of soil formation, soil attributes such asSOC stocks can be empirically modelled based on soil forming factors: climate, organisms, relief, parent materialand man. Spatial correlation of SOC stocks at the ICOS site Sorø, Denmark was correlated with importantenvironmental controls (soil water and aeration status). SOC to 40 cm depth was measured in 10 cm segments ofca. 100 soil cores sampled in a grid design (30 x 30 m). The water tables at high and low positions were loggeddaily, and soil redox potential was measured continuously along three elevation gradients at a soil depth of 20cm during 2015 – 2017 along with iron rod assays. A visual assessment of drainage class using photos and fielddescriptions of soil morphology confirmed a diverse drainage pattern from well-drained to very poorly drainedsoil with a shallow water table depending on the relief (LiDAR based high resolution digital elevation model) anddepth to subsoil parent material that consisted of dense calcareous till.Low-lying, wet areas had strongly reducing conditions with a reduction potential (Eh) of -150 to 50 mV for mostof the year, except in late summer, where Eh fluctuated following rain events until permanent water saturation wasre-established. In upland areas a winter water table occasionally prevailed around 50 - 70 cm soil depth. Thesesoils did not have an Eh lower than 7-800 mV indicating an aerobic soil environment throughout the year.The network of ditches indicates that high SOC stocks have accumulated in water saturated conditions, and thatthese areas today have water tables governed by the ditches promoting surface runoff when surplus precipitationis present.The SOC stock variability could be explained by the DEM and DEM derivatives including mapping of the presenceof ditches that explain the current water regime and soil aeration. A spatial understanding of soil aeration and tem-perature can guide the design of soil respiration measurements at the stand scale and improve area based upscaling.

Variation in SOC stocks as explained by soil forming factors at the ICOS site Sorø, Denmark

https://curis.ku.dk/portal/files/221837526/EGU2018_0.pdf

Variation in SOC stocks as explained by soil forming factors at the ICOS site Sorø, Denmark

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