Universität zu Köln

Dorau, K., Luster, J. and Mansfeldt, T. (2018). Soil aeration: the relation between air-filled pore volume and redox potential. Eur. J. Soil Sci., 69 (6). S. 1035 - 1044. HOBOKEN: WILEY. ISSN 1365-2389

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Abstract

The soil water content affects rates of oxygen diffusion and redox potentials (E-H). When water-saturated soils become aerated, a switch from reducing to oxidizing conditions occurs. However, limited information is available on the air-filled pore volume (epsilon) at which this shift happens. To obtain values of epsilon, undisturbed soil cores were taken from a Fluvisol and a Gleysol that differed in structure and clay content. Experiments on submergence and drying following a new experimental design were performed in the laboratory. After submergence, the cores were sealed with a glass hood to exclude oxygen and to achieve reducing conditions (E-H < -100 mV). We then aerated the sample by removal of glass plugs in the hood and measured E-H consecutively by platinum (Pt) electrodes and epsilon by matric potential readings on an hourly basis. From the drying curve we determined two characteristic values: (i) epsilon(Pt reaction) indicates the air-filled pore volume at which a response of the Pt electrode to contact with oxygen occurs (i.e. E-H increase > 5 mV hour(-1)) and (ii) epsilon(Pt aeration) indicates when oxidizing soil conditions are present (i.e. E-H > 300 mV at pH 7). The Fluvisol was characterized by an epsilon(Pt reaction) value of 0.036 +/- 0.006 cm(3) cm(-3) and an epsilon(Pt aeration) value of 0.047 +/- 0.005, whereas for the Gleysol these values were 0.048 +/- 0.008 and 0.085 +/- 0.007 cm(3) cm(-3), respectively. We aimed to obtain such characteristic values for different soils to estimate the aeration status of a soil when epsilon is known, but E-H measurements were unavailable.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Dorau, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Luster, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mansfeldt, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-166845
DOI:	10.1111/ejss.12717
Journal or Publication Title:	Eur. J. Soil Sci.
Volume:	69
Number:	6
Page Range:	S. 1035 - 1044
Date:	2018
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1365-2389
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language OXYGEN DIFFUSION RATE; MARSH SOIL; WATER; RICE Multiple languages Soil Science Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16684