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Long-term effects of organic farming on fungal and bacterial residues in relation to microbial energy metabolism

Joergensen, Rainer Georg; Mäder, Paul and Fließbach, Andreas (2010) Long-term effects of organic farming on fungal and bacterial residues in relation to microbial energy metabolism. Biology and Fertility of Soils, 46 (3), pp. 303-307.

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Online at: http://www.springerlink.com/content/kq022t6700365mx1/fulltext.pdf


Samples from the bio-dynamic, bio-organic, and conventional trial, Therwil, Switzerland, were analyzed with the aim of determining the effects of organic land use management on the energy metabolism of the soil microbial biomass and on the fraction of microbial residues. The contents of adenylates, adenosine triphosphate (ATP), glucosamine, muramic acid, and galactosamine were significantly largest in the biodynamic organic farming (BYODIN) treatment and significantly lowest in the conventional farming treatment with inorganic fertilization (CONMIN). In contrast, the ergosterol-to-ATP ratio and fungal C-to-bacterial C ratios were significantly lowest in the BYODIN treatment and significantly largest in the CONMIN treatment. No clear treatment effects were observed for the ergosterol content and the adenylate energy charge (AEC), the ATP-to-microbial biomass C ratio and the ergosterol-to-fungal C ratio. Ergosterol, an indicator for saprotrophic fungal biomass, and fungal residues were significantly correlated. The microbial biomass carbon-to-nitrogen ratio showed a negative relationship with the AEC and strong positive relationships with the ratios ergosterol-to-microbial biomass C, ergosterol-to-ATP and fungal C-to-bacterial C. In conclusion, the long-term application of farmyard manure in combination with organic farming practices led to an increased accumulation of bacterial residues.

EPrint Type:Journal paper
Keywords:DOK trial, Amino sugars, Ergosterol, Adenylates, ATP, Bodenwissenschaften, Bodenfruchtbarkeit, DOK
Subjects: Soil > Soil quality > Soil biology
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil Sciences
Related Links:http://www.uni-kassel.de/agrar/bbp/?c=7&language=en, http://www.springerlink.com/content/kq022t6700365mx1/fulltext.pdf, http://www.fibl.org/de/schweiz/forschung/bodenwissenschaften/bodenwissenschaften-forschungsschwerpunkte.html#c7859
Deposited By: Mäder, Paul
ID Code:17860
Deposited On:13 Oct 2010 12:05
Last Modified:14 Oct 2010 12:25
Document Language:English
Refereed:Peer-reviewed and accepted

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