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Titolo:
Impact of elevated CO2 on soil organic matter dynamics as related to changes in aggregate turnover and residue quality
Autore:
Six, J; Carpentier, A; van Kessel, C; Merckx, R; Harris, D; Horwath, WR; Luscher, A;
Indirizzi:
Colorado State Univ, Nat Resource Ecol Lab, Ft Collins, CO 80523 USA Colorado State Univ Ft Collins CO USA 80523 Lab, Ft Collins, CO 80523 USA Univ Calif Davis, Dept Agron & Range Sci, Davis, CA 95616 USA Univ Calif Davis Davis CA USA 95616 gron & Range Sci, Davis, CA 95616 USA Katholieke Univ Leuven, Lab Soil Fertil & Soil Biol, B-3001 Heverlee, Belgium Katholieke Univ Leuven Heverlee Belgium B-3001 B-3001 Heverlee, Belgium Univ Calif Davis, Stable Isotope Facil, Davis, CA 95616 USA Univ Calif Davis Davis CA USA 95616 le Isotope Facil, Davis, CA 95616 USA Swiss Fed Inst Technol, Inst Plant Sci, CH-8092 Zurich, Switzerland Swiss Fed Inst Technol Zurich Switzerland CH-8092 92 Zurich, Switzerland
Titolo Testata:
PLANT AND SOIL
fascicolo: 1, volume: 234, anno: 2001,
pagine: 27 - 36
SICI:
0032-079X(200107)234:1<27:IOECOS>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATMOSPHERIC CARBON-DIOXIDE; TRIFOLIUM-REPENS L; GRASSLAND ECOSYSTEM; CULTIVATED SOILS; LITTER QUALITY; LOLIUM-PERENNE; DECOMPOSITION; NITROGEN; ENRICHMENT; GROWTH;
Keywords:
aggregate; delta C-13; elevated CO2; particulate organic matter (POM); residue quality; soil organic matter (SOM);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Six, J Colorado State Univ, Nat Resource Ecol Lab, Ft Collins, CO 80523 USA Colorado State Univ Ft Collins CO USA 80523 Collins, CO 80523 USA
Citazione:
J. Six et al., "Impact of elevated CO2 on soil organic matter dynamics as related to changes in aggregate turnover and residue quality", PLANT SOIL, 234(1), 2001, pp. 27-36

Abstract

Increasing global atmospheric CO2 concentration can potentially affect C cycling in terrestrial ecosystems. This study was conducted to assess the impact of elevated CO2 concentration on soil organic matter and aggregate dynamics in Lolium perenne and Trifolium repens pastures. Soil samples from a 6 year old `free air CO2 enrichment' (FACE) experiment were separated in four aggregate size classes (< 53, 53-250, 250-2000, and > 2000 mum). Free light fraction (i.e. particulate organic matter (POM) outside of aggregates; free LF) and intra-aggregate-POM (i.e. POM occluded within the aggregate structure; iPOM) were isolated. The distinct C-13-signature of the CO2 used to raise the ambient CO2 concentration in FACE allowed us to calculate proportions of recently incorporated C (< 6 yr) in the physically defined soil fractions. The proportion of new C increased with increasing aggregate size class, except the two largest aggregate size classes had a similar proportion of new C; this indicates a faster turnover of macroaggregates compared to microaggregates. In addition, higher proportions of new C in macroaggregates under T. repens compared to L. perenne indicate a faster macroaggregateturnover under T. repens. This faster macroaggregate turnover is hypothesized to be a result of the higher residue quality (C:N ratio) of T. repens compared to L. perenne and reduces the potential of sequestering C under elevated CO2. In the L. perenne soil, elevated CO2 did not significantly increase total C, but led to: (1) a 54% increase in aggregation and (2) a 40% increase in total iPOM-C. It is hypothesized that the sequestration of iPOM-Cinduced by elevated CO2 in the low residue quality, L. perenne treatment, resulted from an increase in the proportion of large macroaggregates with aslow turnover.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 07:59:05