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Unravelling collembolan life belowground: Stoichiometry, metabolism and release of carbon and nitrogen

Larsen, Thomas (2007) Unravelling collembolan life belowground: Stoichiometry, metabolism and release of carbon and nitrogen. Thesis, Plant Nutrition and Soil Fertility Laboratory, University of Copenhagen and Dept. of Terrestrial Ecology, NERI. National Environmental Research Institute. National Environmental Research Institute © University of Aarhus - Denmark.

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Summary

This thesis investigated carbon and nitrogen dynamics of soil dwelling Collembola by using direct measurements and stable isotope additions. In an isotope change experiment, collembolans exchanged between 6 and 10% of carbon and nitrogen in their body tissue per day to metabolism and between 0.5 and 2% to reproduction. When collembolans on low and high protein diets were compared, animals on the low protein quality depleted their tissue 15N values relative to those on high quality diet indicating that the nitrogen turnover decreased on the low protein quality diet. In a wheat microcosm investigating
source contributions from soil, roots and isotope labelled green manure the mixing model analysis indicated that photosynthate (root derived C) was the main carbon source for collembolans (54–79% of total C) indicating that the rhizosphere channel is very important for collembolans in addition to the detritus based channel.


EPrint Type:Thesis
Thesis Type:Ph.D.
Subjects: Soil > Nutrient turnover
Research affiliation: Denmark > KU-LIFE - Faculty of Life Sciences
Denmark > AU - Aarhus University > AU, NERI - National Environmental Research Institute
Denmark > DARCOF II (2000-2005) > III.3 (CRUCIAL) Closing the rural-urban nutrient cycle
Denmark > SOAR - Research School for Organic Agriculture and Food Systems
Deposited By: Larsen, Thomas
ID Code:10585
Deposited On:27 Feb 2007
Last Modified:12 Apr 2010 07:35
Document Language:English
Status:Published
Refereed:Not peer-reviewed

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