Universität zu Köln

Rosinger, Christoph ORCID: 0000-0002-4973-3921 and Bonkowski, Michael ORCID: 0000-0003-2656-1183 (2021). Soil age and soil organic carbon content shape biochemical responses to multiple freeze-thaw events in soils along a postmining agricultural chronosequence. Biogeochemistry, 155 (1). S. 113 - 126. DORDRECHT: SPRINGER. ISSN 1573-515X

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Abstract

Freeze-thaw (FT) events exert a great physiological stress on the soil microbial community and thus significantly impact soil biogeochemical processes. Studies often show ambiguous and contradicting results, because a multitude of environmental factors affect biogeochemical responses to FT. Thus, a better understanding of the factors driving and regulating microbial responses to FT events is required. Soil chronosequences allow more focused comparisons among soils with initially similar start conditions. We therefore exposed four soils with contrasting organic carbon contents and opposing soil age (i.e., years after restoration) from a postmining agricultural chronosequence to three consecutive FT events and evaluated soil biochgeoemical responses after thawing. The major microbial biomass carbon losses occurred after the first FT event, while microbial biomass N decreased more steadily with subsequent FT cycles. This led to an immediate and lasting decoupling of microbial biomass carbon:nitrogen stoichiometry. After the first FT event, basal respiration and the metabolic quotient (i.e., respiration per microbial biomass unit) were above pre-freezing values and thereafter decreased with subsequent FT cycles, demonstrating initially high dissimilatory carbon losses and less and less microbial metabolic activity with each iterative FT cycle. As a consequence, dissolved organic carbon and total dissolved nitrogen increased in soil solution after the first FT event, while a substantial part of the liberated nitrogen was likely lost through gaseous emissions. Overall, high-carbon soils were more vulnerable to microbial biomass losses than low-carbon soils. Surprisingly, soil age explained more variation in soil chemical and microbial responses than soil organic carbon content. Further studies are needed to dissect the factors associated with soil age and its influence on soil biochemical responses to FT events.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Rosinger, Christoph UNSPECIFIED orcid.org/0000-0002-4973-3921 UNSPECIFIED Bonkowski, Michael UNSPECIFIED orcid.org/0000-0003-2656-1183 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-574851
DOI:	10.1007/s10533-021-00816-5
Journal or Publication Title:	Biogeochemistry
Volume:	155
Number:	1
Page Range:	S. 113 - 126
Date:	2021
Publisher:	SPRINGER
Place of Publication:	DORDRECHT
ISSN:	1573-515X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NITROUS-OXIDE EMISSIONS; MICROBIAL BIOMASS; ENZYME-ACTIVITIES; MATTER TURNOVER; CYCLES; COMMUNITIES; DISTURBANCE; RESILIENCE; RESISTANCE; GRADIENTS Multiple languages Environmental Sciences; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57485