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Sammanfattning

Mechanistic models are often used to predict N mineralisation from soil organic matter. Such models usually estimate N mineratisation from C mineralisation, often necessitating assumptions about the C:N ratio of the decomposing organic matter. We tested, in a Laboratory experiment, whether the latter was reflected in the C:N ratio of bulk soil organic matter. Soils that, since 1956, had received organic amendments of widely different C:N ratios were sampled in May 2001, approximately 18 months after the last applications of the amendments. Carbon and gross N minerahsation were determined consecutively over a 17-week incubation period at 20degreesC. Gross N mineralisation rates were estimated using equations based on first-order kinetics for NH4+ consumption. Despite differences in C:N of the bulk soil organic matter, across the soils gross N mineratisation was approximately proportional to C mineratisation. The proportionality factor between C and gross N mineralisation was approximately 5 (gross N mineratisation in relation to C mineralisation), suggesting that C:N of the decomposing organic matter of ca. 9 in all soils.

Nyckelord

C : N ratio; mechanistic models; minerahsation; soil organic matter

Publicerad i

Titel: Controlling nitrogen flows and losses
Utgivare: Wageningen Academic Publishers

SLU författare

  • Herrmann, Anke

    • Institutionen för markvetenskap, Sveriges lantbruksuniversitet

  • Witter, Ernst

    • Institutionen för markvetenskap, Sveriges lantbruksuniversitet

UKÄ forskningsämne

Markvetenskap
Jordbruksvetenskap

Publikationens identifierare

  • ISBN: 978-90-76998-43-5

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/2863