Universität zu Köln

Dorau, Kristof ORCID: 0000-0002-1815-1929 and Mansfeldt, Tim ORCID: 0000-0002-7557-6827 (2016). Comparison of redox potential dynamics in a diked marsh soil: 1990 to 1993 versus 2011 to 2014. J. Plant Nutr. Soil Sci., 179 (5). S. 641 - 652. WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1522-2624

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Abstract

As revealed by an earlier study, young diked marsh soils on the west coast of Schleswig-Holstein (Germany) are characterized by pronounced redox potential (E-H) dynamics. Since soil forming processes occur over a short period of time in these man-made environments, the impact of pedogenesis on E-H was examined by comparing the E-H dynamics measured from November 1989 to October 1993 (weekly measurements) with those measured from November 2010 to October 2014 (hourly measurements) at the same study site in Polder Speicherkoog, Northern Germany. In addition, the necessity for high resolution E-H measurements was assessed as well as the impact of climate change on E-H. Redox potentials were determined in both monitoring campaigns with permanently installed platinum electrodes at 10, 30, 60, 100, and 150cm soil depths. Soil properties were determined in November 1989 and in August 2013. In 24 years of soil formation, bulk density was demonstrated to increase by 28.5% and 33.3% in 10 and 20 cm depths, respectively, and the sulfide-bearing Protothionic horizon lowered from 105 to 135 cm below surface level. Overall, E-H dynamics were similar at all soil depths during both study periods with topsoil compaction not affecting E-H. Annual alterations of E-H were primarily driven by the variable climatic water balance (CWB) and by the corresponding water table (WT) fluctuations. These fluctuations resulted in occasional aeration of the subsoil and subsequent oxidation of sulfides. A forecast of CWB to 2100 predicts an intensified WT drawdown by elevated evapotranspiration rates that should amplify sulfide oxidation. To deduce the soil redox status on a seasonal or annual scale, readings taken at daily intervals are sufficient. To identify biogeochemical processes, it is necessary to monitor E-H on an hourly basis because increases in E-H values of up to 540 mV have been observed within a 24 hour period in temporarily waterlogged horizons.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Dorau, Kristof UNSPECIFIED orcid.org/0000-0002-1815-1929 UNSPECIFIED Mansfeldt, Tim UNSPECIFIED orcid.org/0000-0002-7557-6827 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-259246
DOI:	10.1002/jpln.201600060
Journal or Publication Title:	J. Plant Nutr. Soil Sci.
Volume:	179
Number:	5
Page Range:	S. 641 - 652
Date:	2016
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1522-2624
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences > Geographisches Institut
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WATER; ELECTRODES; GENESIS Multiple languages Agronomy; Plant Sciences; Soil Science Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25924