Full TGIF Record # 101506
Item 1 of 1
Publication Type:
i
Refereed
Author(s):Personeni, E.; Loiseau, P.
Author Affiliation:Fonctionnement et Gestion de l'Ecosystème Prairial, Unité d'Agronomie, INRA, Domaine de Crouelle, France
Title:How does the nature of living and dead roots affect the residence time of carbon in the root litter continuum?
Source:Plant and Soil. Vol. 267, No. 1/2, December 2004, p. 129-141.
# of Pages:13
Publishing Information:Dordrecht, Netherlands: Kluwer Academic Publishers
Related Web URL:http://link.springer.com/article/10.1007/s11104-005-4656-3
    Last checked: 10/14/2015
    Notes: Abstract only
Keywords:TIC Keywords: Carbon; Grasslands; Roots; Organic matter; Carbon to nitrogen ratio; Decomposition; Soil sampling; Fractionation; Dactylis; Lolium
Abstract/Contents:"Root litter transformation is an important determinant of the carbon cycle in grassland ecosystems. Litter quality and rhizosphere activity are species-dependent factors which depend on the attributes of the dead and living roots respectively. These factors were tested, using non-disturbed soil monoliths of Dactylis glomerata L. and Lolium perenne L. monocultures. 13C-labelled root litter from these monoliths was obtained from a first stand of each crop, cultivated under very őī13C-depleted atmospheric CO2 (S1). In a factorial design, 13C-labelled root litter of each species was submitted to a second, non 13C-labelled, living stand of each species (S2). Carbon derived from S1 and from S2 was measured during an 18-month incubation in the root phytomass and in three particulate organic matter fractions (POM). The decay rate of each particle size fraction was fitted to the experimental data in a mechanistic model of litter transformation, whose outputs were mineralisation and stabilisation of the litter-C. Few differences were found between species, in the amount and biochemical composition of the initial root litter, but Dactylis roots showed a greater C:N ratio, a lower mean root diameter and a greater specific root length compared to Lolium. A transient accumulation of litter residues arose successively in POM fractions of decreasing particle size. The litter-continuum hypothesis was validated, i.e. that the attributes of the compartments (C:N, chemical composition and residence time) depended mainly on their particle size. The S1 species influenced the rate of litter decay while the S2 species controlled the efficiency of litter-C stabilisation versus mineralisation: Dactylis litter decomposed faster and Lolium rhizosphere allowed a greater proportion of litter C stabilisation. Discussions focus on the processes responsible of species strategy in relation with the morphological root traits, and the implication of strategy diversity for rich grassland communities."
Language:English
References:40
Note:Figures
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Personeni, E., and P. Loiseau. 2004. How does the nature of living and dead roots affect the residence time of carbon in the root litter continuum?. Plant Soil. 267(1/2):p. 129-141.
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