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Titolo:
SHORT-TERM KINETICS OF RESIDUAL WHEAT-STRAW C AND N UNDER FIELD CONDITIONS - CHARACTERIZATION BY (CN)-C-13-N-15 TRACING AND SOIL PARTICLE-SIZE FRACTIONATION
Autore:
AITA C; RECOUS S; ANGERS DA;
Indirizzi:
INRA,UNITE AGRON,RUE F CHRIST F-02007 LAON FRANCE INRA,UNITE AGRON F-02007 LAON FRANCE UNIV FED SANTA MARIA,DEPT SOLOS BR-97119900 SANTA MARIA RS BRAZIL AGR & AGROALIMENTAIRE CANADA,CTR RECH SOLS & GRANDES CULTURES ST FOY PQ G1V 2J3 CANADA
Titolo Testata:
European journal of soil science
fascicolo: 2, volume: 48, anno: 1997,
pagine: 283 - 294
SICI:
1351-0754(1997)48:2<283:SKORWC>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANIC-MATTER; PLANT-MATERIAL; BARLEY STRAW; DECOMPOSITION; CARBON; NITROGEN; MINERALIZATION; DYNAMICS; BIOMASS; C-13;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
C. Aita et al., "SHORT-TERM KINETICS OF RESIDUAL WHEAT-STRAW C AND N UNDER FIELD CONDITIONS - CHARACTERIZATION BY (CN)-C-13-N-15 TRACING AND SOIL PARTICLE-SIZE FRACTIONATION", European journal of soil science, 48(2), 1997, pp. 283-294

Abstract

A clear understanding of the short-term decomposition and fate of crop residues is necessary to predict the availability of mineral N in soil. The fate of (CN)-C-13-N-15-labelled wheat straw in a silty soil (Typic Hapludalf) was studied using particle size fractionation and in situ incubation in which the equivalent of 8 t dry matter per ha of straw was incorporated into the soil over 574 days. Soil samples were separated into five particle-size fractions by wet sieving after disruption of aggregates. The weight, C and N contents, and C-13 and N-15 atomexcess of each fraction were determined. Straw-derived C disappeared rapidly from the >2000-mu m fraction with an estimated half-life of 53'normalized' days (equivalent of 10 degrees C and -0.01 MPa water potential). Straw-derived C appeared to be only temporarily stored in theintermediate fractions (1000-2000 and 200-1000 mu m). The maximum netC-13 accumulation in the 50-200-mu m fraction was 4.4% of added C-13. Straw-derived C accumulated most rapidly and preferentially in the <50-mu m fraction, which stabilized after 265 days and accounted for 70%of the residual C-13 on day 574. Although there was more residual N-15 than C-13, the distributions and kinetics of the two isotopes in thefractions were similar.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 06:15:27