Elastic and plastic soil deformation and its influence on emission of greenhouse gases.

Haas, C., Holthusen, D., Mordhorst, A., Lipiec, J. and Horn, Rainer (2016) Elastic and plastic soil deformation and its influence on emission of greenhouse gases. International Agrophysics, 30 (2). pp. 173-184. DOI 10.1515/intag-2015-0088.

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Abstract

Soil management alters physical, chemical and biological soil properties. Stress application affects microbiological activity and habitats for microorganisms in the root zone and causes soil degradation. We hypothesized that stress application results in altered greenhouse gas emissions if soil strength is exceeded. In the experiments, soil management dependent greenhouse gas emissions of intact soil cores (no, reduced, conventional tillages) were determined using two experimental setups; CO2 emissions were determined with: a dynamic measurement system, and a static chamber method before and after a vertical soil stress had been applied. For the latter CH4 and N2O emissions were analyzed additionally. Stress dependent effects can be summed as follows: In the elastic deformation range microbiological activity increased in conventional tillage soil and decreased in reduced tillage and no tillage. Beyond the precompression stress a release of formerly protected soil organic carbon and an almost total loss of CH4 oxidizability occurred. Only swelling and shrinkage of no tillage and reduced tillage regenerated their microhabitat function. Thus, the direct link between soil strength and microbial activity can be applied as a marker for soil rigidity and the transition to new disequilibria concerning microbial activity and composition.

Document Type: Article
Additional Information: Times Cited: 0 Haas, Christoph Holthusen, Doerthe Mordhorst, Anneka Lipiec, Jerzy Horn, Rainer
Keywords: biological activity, strength, compaction, respiration, gas emission
Research affiliation: Kiel University
Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1515/intag-2015-0088
ISSN: 0236-8722
Projects: Future Ocean
Date Deposited: 27 Feb 2017 08:56
Last Modified: 23 Sep 2019 22:02
URI: http://oceanrep.geomar.de/id/eprint/36117

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