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Titolo: SHORTTERM KINETICS OF RESIDUAL WHEATSTRAW C AND N UNDER FIELD CONDITIONS  CHARACTERIZATION BY (CN)C13N15 TRACING AND SOIL PARTICLESIZE FRACTIONATION
Autore: AITA C; RECOUS S; ANGERS DA;
 Indirizzi:
 INRA,UNITE AGRON,RUE F CHRIST F02007 LAON FRANCE INRA,UNITE AGRON F02007 LAON FRANCE UNIV FED SANTA MARIA,DEPT SOLOS BR97119900 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:
 13510754(1997)48:2<283:SKORWC>2.0.ZU;2L
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 ORGANICMATTER; PLANTMATERIAL; BARLEY STRAW; DECOMPOSITION; CARBON; NITROGEN; MINERALIZATION; DYNAMICS; BIOMASS; C13;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Science Citation Index Expanded
 Citazioni:
 36
 Recensione:
 Indirizzi per estratti:



 Citazione:
 C. Aita et al., "SHORTTERM KINETICS OF RESIDUAL WHEATSTRAW C AND N UNDER FIELD CONDITIONS  CHARACTERIZATION BY (CN)C13N15 TRACING AND SOIL PARTICLESIZE FRACTIONATION", European journal of soil science, 48(2), 1997, pp. 283294
Abstract
A clear understanding of the shortterm decomposition and fate of crop residues is necessary to predict the availability of mineral N in soil. The fate of (CN)C13N15labelled 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 particlesize fractions by wet sieving after disruption of aggregates. The weight, C and N contents, and C13 and N15 atomexcess of each fraction were determined. Strawderived C disappeared rapidly from the >2000mu m fraction with an estimated halflife of 53'normalized' days (equivalent of 10 degrees C and 0.01 MPa water potential). Strawderived C appeared to be only temporarily stored in theintermediate fractions (10002000 and 2001000 mu m). The maximum netC13 accumulation in the 50200mu m fraction was 4.4% of added C13. Strawderived C accumulated most rapidly and preferentially in the <50mu m fraction, which stabilized after 265 days and accounted for 70%of the residual C13 on day 574. Although there was more residual N15 than C13, 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