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DOI: | 10.1016/j.soilbio.2010.02.007 |
Web URL(s): | http://www.sciencedirect.com/science/article/pii/S00380717/1000060x/ Last checked: 03/14/2012 Access conditions: Item is within a limited-access website |
Publication Type:
| Refereed |
Author(s): | zu Schweinsberg-Mickan, Mario Schenck;
Joergensen, Rainer Georg;
Müller, Torsten |
Author Affiliation: | zu Schweinsberg-Mickan and Joergensen: Department of Soil Biology and Plant Nutrition, University of Kassel, Witzenhausen; zu Schweinsberg-Mickan and Müller: Department of Plant Nutrition, Universität Hohenheim, Stuttgart, Germany |
Title: | Fate of 13C- and 15N-labelled rhizodeposition of Lolium perenne as function of the distance to the root surface |
Source: | Soil Biology & Biochemistry. Vol. 42, No. 6, June 2010, p. 910-918. |
Publishing Information: | Pergamon |
# of Pages: | 9 |
Keywords: | TIC Keywords: Biomass determination; Carbon; Isotopes; Lolium perenne; Microbiological soil analysis; Nitrogen; Organic matter; Rhizodeposition; Rhizosphere; Soil microorganisms
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Abstract/Contents: | "A greenhouse rhizobox experiment was carried out to quantify the incorporation of 13C- and 15N-labelled rhizodeposits into different soil pools, especially into the rhizosphere microbial biomass, with increasing distances to the root surface of Lolium perenne. Five layers were analysed over 0-4.2 mm distance to an artificial root surface. C and N derived from rhizodeposition were 4.2% of total C and 2.8% of total N in soil at 0-1.0 mm distance and decreased rapidly with increasing distance. Microbial biomass C and N increased significantly towards the roots. At 0-1.0 mm distance microbial biomass C and N accounted for 66% and 29% of C and N derived from rhizodeposition, respectively. These percentages declined with increasing distance to the roots, but were still traceable up to 4.2 mm distance. Only small amounts of root released C and N were found in the 0.05 M K2SO4-extractable fraction. Extractable C and N derived from rhizodeposition varied around means of 4% of total C and N derived from rhizodeposition and increased only marginally with increasing distance to the roots. C derived from rhizodeposition in the non-extractable soil organic matter increased from 65 to 89% of total C derived from rhizodeposition at 0-3.4 mm distance. Conversely, microbial biomass C derived from rhizodeposition decreased from 33 to 4%. N derived from rhizodeposition in the non-extractable soil organic matter increased from 61 to 79% of total N derived from rhizodeposition at 0-2.6 mm distance, followed by a decline to roughly 55% in the two outer layers. Microbial biomass N decreased from 37 to 16% at 0-2.6 mm distance, followed by an increase to roughly 41% in the two outer layers. The C/N ratio of total C and N derived from rhizodeposition as well as that of extractable C and N derived from rhizodeposition increased with increasing distance to the roots to values above 30. In contrast, the C/N ratio of incorporated rhizodeposition C and N into the microbial biomass decreased to values less than 5 at 2.6-4.2 mm distance. The data indicate differential microbial response to C and N derived from rhizodeposition at a high spatial resolution from the root surface. The turnover of C and N derived from rhizodeposition in the rhizosphere as a function of the distance to the root surface is discussed." |
Language: | English |
References: | 53 |
Note: | Tables Graphs |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): zu Schweinsberg-Mickan, M. S., R. G. Joergensen, and T. Müller. 2010. Fate of 13C- and 15N-labelled rhizodeposition of Lolium perenne as function of the distance to the root surface. Soil Biol. Biochem. 42(6):p. 910-918. |
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| DOI: 10.1016/j.soilbio.2010.02.007 |
| Web URL(s): http://www.sciencedirect.com/science/article/pii/S00380717/1000060x/ Last checked: 03/14/2012 Access conditions: Item is within a limited-access website |
| MSU catalog number: b2217194 |
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