Full TGIF Record # 62489
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Web URL(s):https://link.springer.com/article/10.1023/A%3A1004681028245
    Last checked: 09/27/2017
    Access conditions: Item is within a limited-access website
    Notes: Guide page
Publication Type:
i
Refereed
Author(s):Loiseau, P.; Soussana, J. F.
Author Affiliation:Fonctionnement et Gestion de l'Ecosystéme Prairial, Unité d'Agronomie, INRA 234, Av. du Brézet. F-63039 Clermont-Ferrand Cedex 2, France
Title:Elevated [CO₂], temperature increase and N supply effects on the turnover of below-ground carbon in a temperate grassland ecosystem
Source:Plant and Soil. Vol. 210, No. 2, 1999, p. 233-247.
# of Pages:15
Publishing Information:Dordrecht, Netherlands: Kluwer Academic Publishers
Keywords:TIC Keywords: Carbon dioxide; Temperatures; Nitrogen; Environmental effects; Grasslands; Carbon cycle; Nitrogen fertilization; Fertilization rates; Decomposition; Lolium perenne; Trifolium repens; Organic matter; Soil sampling; Analysis; Mathematical equations; Leaves; Roots
Abstract/Contents:"The effects of elevated [CO₂] (700 μ11⁻¹ CO₂) and temperature increase (+3 °C) on carbon turnover in grassland soils were studied during 2.5 years at two N fertiliser supplies (160 and 530 kg N ha⁻¹ y⁻¹) in an experiment with well-established ryegrass swards (Lolium perenne) supplied with the same amounts of irrigation water. During the growing season, swards from the control climate (350 μ11⁻¹ [CO₂] at outdoor air temperature) were pulse labelled by the addition of ¹³CO₂. The elevated [CO₂] treatments were continuously labelled by the addition of fossil-fuel derived CO₂ ( δ¹³C of -40 to -50%). Prior to the start of the experimental treatments, the carbon accumulated in the plant parts and in the soil macro-organic matter ('old' C) was at -32%. During the experiment, the carbon fixed in the plant material ('new' C) was at -14 and -54% in the ambient and elevated [CO₂] treatments, respectively. During the experiment, the ¹³C isotopic mass balance method was used to calculate, for the top soil (0-15 cm), the carbon turnover in the stubble and roots and in the soil macro-organic matter above 200 μ (MOM). Elevated [CO₂] stimulated the turnover of organic carbon in the roots and stubble and in the MOM at N+, but not at N-. At the high N supply, the mean replacement time of 'old' C by 'new' C declined in elevated, compared to ambient [CO₂], from 18 to 7 months for the roots and stubble and from 25 to 17 months for the MOM. This resulted from increased rates of 'new' C accumulation and of 'old' C decay. By contrast, at the low N supply, despite an increase in the rate of accumulation of 'new' C, the soil C pools did not turnover faster in elevated [CO₂], as the rate of 'old' C decomposition was reduced. A 3 °C temperature increase in elevated [CO₂} decreased the input of fresh C to the roots and stubble and enhanced significantly the exponential rate for the 'old' C decomposition in the roots and stubble. An increased fertiliser N supply reduced the carbon turnover in the roots and stubble and in the MOM, in ambient but not in elevated [CO₂]. The repective roles for carbon turnover in the coarse soil OM fractions, of the C:N ratio of the litter, of the inorganic N availability and of a possible priming effect between C-substrates are discussed."
Language:English
References:47
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Loiseau, P., and J. F. Soussana. 1999. Elevated [CO₂], temperature increase and N supply effects on the turnover of below-ground carbon in a temperate grassland ecosystem. Plant Soil. 210(2):p. 233-247.
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https://link.springer.com/article/10.1023/A%3A1004681028245
    Last checked: 09/27/2017
    Access conditions: Item is within a limited-access website
    Notes: Guide page
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