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Titolo:
FATE OF CARBON AND NITROGEN IN WATER-STABLE AGGREGATES DURING DECOMPOSITION OF (CN)-C-13-N-15-LABELED WHEAT-STRAW IN-SITU
Autore:
ANGERS DA; RECOUS S; AITA C;
Indirizzi:
2560 BLVD HOCHELAGA ST FOY PQ G1V 2J3 CANADA CTR RECH DOLS GRANDES CULTURES AGR & AGROALIMENTA ST FOY PQ G1V 2J3 CANADA INRA,UNITE AGRON LAON PERONNE F-02007 LAON FRANCE UNIV FED SANTA MARIA,DEPT SOLOS BR-97019 SANTA MARIA RS BRAZIL
Titolo Testata:
European journal of soil science
fascicolo: 2, volume: 48, anno: 1997,
pagine: 295 - 300
SICI:
1351-0754(1997)48:2<295:FOCANI>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANIC-MATTER; CULTIVATED SOILS; PLANT-MATERIAL; STABILIZATION; TURNOVER; FIELD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
D.A. Angers et al., "FATE OF CARBON AND NITROGEN IN WATER-STABLE AGGREGATES DURING DECOMPOSITION OF (CN)-C-13-N-15-LABELED WHEAT-STRAW IN-SITU", European journal of soil science, 48(2), 1997, pp. 295-300

Abstract

When incorporated in soil, plant residues and their decomposition products are in close contact with mineral particles with which they can be bound to form aggregates. We measured the incorporation of carbon (C) and nitrogen (N) derived from crop residues in water-stable aggregate fractions of a silty soil in a field experiment in Northern France using (CN)-C-13-N-15-labelled wheat straw (Triticum aestivum L.). Soilsamples were taken seven times for 18 months and separated into slaking-resistant aggregate size fractions which were analysed for total C and N contents, and C-13 and N-15 enrichments, During the early stagesof decomposition (approximately 200 days), the enrichment of C-13 increased rapidly in the macroaggregates (> 250 mu m) but decreased thereafter. The macroaggregates represented only <20% of the soil mass and at any one time, they accounted for <25% of the residual C-13 in the soil. The proportion of C-13 recovered in the <50-mu m and 50-250-mu fractions increased during decomposition of the residues; at day 574, the 50-250-mu m fraction accounted for close to 50% of the residual C-13. A greater proportion of N-15 than C-13 was recovered in the <50-mu mfraction. The results indicate that during decomposition in soil, C and N from crop residues become rapidly associated with stable aggregates. In this silty soil the 50-250-mu m stable aggregates appear to be involved in the storage and stabilization of C from residues.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 07:20:57