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Titolo:
Decomposition of C-13-labelled standard plant material in a latitudinal transect of European coniferous forests: Differential impact of climate on the decomposition of soil organic matter compartments
Autore:
Couteaux, MM; Bottner, P; Anderson, JM; Berg, B; Bolger, T; Casals, P; Romanya, J; Thiery, JM; Vallejo, VR;
Indirizzi:
CNRS, CEFE, F-34293 Montpellier 5, France CNRS Montpellier France 5CNRS, CEFE, F-34293 Montpellier 5, France Univ Exeter, Sch Biol Sci, Hatherly Labs, Exeter EX4 4PS, Devon, England Univ Exeter Exeter Devon England EX4 4PS , Exeter EX4 4PS, Devon, England Univ Bayreuth, BITOK, Dept Soil Ecol, DE-95448 Bayreuth, Germany Univ Bayreuth Bayreuth Germany DE-95448 Ecol, DE-95448 Bayreuth, Germany Natl Univ Ireland Univ Coll Dublin, Dept Zool, Dublin 4, Ireland Natl UnivIreland Univ Coll Dublin Dublin Ireland 4 l, Dublin 4, Ireland Univ Barcelona, Dept Biol Vegetal, SP-08028 Barcelona, Spain Univ Barcelona Barcelona Spain SP-08028 getal, SP-08028 Barcelona, Spain CEA Cadarache, DSV DEVM Valorisat, F-13108 St Paul Lez Durance, France CEACadarache St Paul Lez Durance France F-13108 aul Lez Durance, France CEAM, Paterna 46980, Spain CEAM Paterna Spain 46980CEAM, Paterna 46980, Spain
Titolo Testata:
BIOGEOCHEMISTRY
fascicolo: 2, volume: 54, anno: 2001,
pagine: 147 - 170
SICI:
0168-2563(2001)54:2<147:DOCSPM>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
5 HAWAIIAN SOILS; TEMPERATURE-DEPENDENCE; NITROGEN MINERALIZATION; CO2 EVOLUTION; MICROBIAL DECOMPOSITION; ROOT DECOMPOSITION; INTERIOR ALASKA; WHEAT RESIDUE; BARLEY STRAW; ARCTIC SOILS;
Keywords:
C-13 labelling; climatic response functions; decomposition; first-order two-compartment models; global change; soil organic matter compartments;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Couteaux, MM CNRS, CEFE, 1919 Route Mende, F-34293 Montpellier 5, France CNRS 1919 Route Mende Montpellier France 5 pellier 5, France
Citazione:
M.M. Couteaux et al., "Decomposition of C-13-labelled standard plant material in a latitudinal transect of European coniferous forests: Differential impact of climate on the decomposition of soil organic matter compartments", BIOGEOCHEMI, 54(2), 2001, pp. 147-170

Abstract

C-13 labelled plant material was incubated in situ over 2 to 3 years in 8 conifer forest soils located on acid and limestone parent material along a north-south climatic transect from boreal to dry Mediterranean regions in western Europe. The objectives of the experiment were to evaluate the effects of climate and the soil environment on decomposition and soil organic matter dynamics. Changes in climate were simulated using a north-to-south cascade procedure involving the relocation of labelled soil columns to the nextwarmer site along the transect. Double exponential, decay-rate functions (for labile and recalcitrant SOM compartments) vs time showed that the thermosensitivity of microbial processes depended on the latitude from which the soil was translocated. Cumulative response functions for air temperature, and for combined temperature andmoisture were used as independent variables in first order kinetic models fitted to the decomposition data. In the situations where climatic responsefunctions explained most of the variations in decomposition rates when thesoils were translocated, the climate optimised decomposition rates for thelocal and the translocated soil should be similar. Differences between these two rates indicated that there was either no single climatic response function for one or both compartments, and/or other edaphic factors influenced the translocation effect. The most northern boreal soil showed a high thermosensitivity for recalcitrant organic matter compartment, whereas the labile fraction was less sensitive to climate changes for soils from more southern locations. Hence there was no single climatic function which describe the decay rates for all compartments. At the end of the incubation period it was found that the heat sum to achieve the same carbon losses was lower for soils in the north of the transect than in the south. In the long term, therefore, for a given heat input, decomposition rates would show larger increases in boreal northern sites than in warm temperate regions. The changes in climate produced by soil translocation were more clearly reflected by decomposition rates in the acid soils than for calcareous soils. This indicates that the physicochemical environment can have important differential effects on microbial decomposition of the labile and recalcitrantcomponents of SOM.

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Documento generato il 28/09/20 alle ore 15:27:09