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| DOI: | 10.1016/j.soilbio.2005.10.002 |
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| Web URL(s): | http://www.sciencedirect.com/science/article/pii/S0038071705003639
Last checked: 07/06/2011
Access conditions: Item is located within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Allard, V.;
Robin, C.;
Newton, P.C.D.;
Lieffering, M.;
Soussana, J.F. |
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| Author Affiliation: | Allard and Soussana: INRA-Agronomie, Clermont-Ferrand, France; Allard and Robin: UMR INPL(ENSAIA)-INRA Agronomie et Environment Nancy-Colmar, Vandoeuvre lès Nancy, France; Newton and Lieffering: Agresearch Grasslands, Palmerston North, New Zealand |
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| Title: | Short and long term effects of elevated CO2 on Lolium perenne rhizodeposition and its consequences on soil organic matter turnover and plant N yield |
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| Source: | Soil Biology & Biochemistry. Vol. 38, No. 6, June 2006, p. 1178-1187. |
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| Publishing Information: | Pergamon |
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| # of Pages: | 10 |
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| Keywords: | TIC Keywords: Biomass determination; Carbon dioxide; Dry weight; Lolium perenne; Nitrogen availability; Decomposition; Organic matter; Radioactive fallout; Rhizodeposition; Tissue testing
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| Abstract/Contents: | "It is still unclear whether elevated CO2 increases plant root exudation and consequently affects the soil microbial biomass. The effects of elevated CO2 on the fate of the C and nitrogen (N) contained in old soil organic matter pools is also unclear. In this study the short and long-term effects of elevated CO2 on C and N pools and fluxes were assessed by growing isolated plants of ryegrass (Lolium perenne) in glasshouses at elevated and ambient atmospheric CO2 and using soil from the New Zealand FACE site that had >4 years exposure to CO2 enrichment. Using 14CO2 pulse labelling, the effects of elevated CO2 on C allocation within the plant-soil system were studied. Under elevated CO2 more root derived C was found in the soil and in the microbial biomass 48 h after labelling. The increased availability of substrate significantly stimulated soil microbial growth and acted as priming effect, enhancing native soil organic matter decomposition regardless of the mineral N supply. Despite indications of faster N cycling in soil under elevated CO2, N availability to plants stayed unchanged. Soil previously exposed to elevated CO2 exhibited a higher N cycling rate but again there was no effect on plant N uptake. With respect to the difficulties of extrapolating glasshouse experiment results to the field, we concluded that the accumulation of coarse organic matter observed in the field under elevated CO2 was probably not created by an imbalance between C and N but was likely to be due to more complex phenomena involving soil mesofauna and/or other nutrients limitations." |
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| Language: | English |
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| References: | 39 |
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| Note: | Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Allard, V., C. Robin, P.C.D. Newton, M. Lieffering, and J.F. Soussana. 2006. Short and long term effects of elevated CO2 on Lolium perenne rhizodeposition and its consequences on soil organic matter turnover and plant N yield. Soil Biol. Biochem. 38(6):p. 1178-1187. |
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| DOI: 10.1016/j.soilbio.2005.10.002 |
| Web URL(s):
http://www.sciencedirect.com/science/article/pii/S0038071705003639
Last checked: 07/06/2011
Access conditions: Item is located within a limited-access website |
| 
MSU catalog number: b2217194 |
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