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Sammanfattning

This study aimed, with the use of simulation models, to quantify the effect of several years incorporation of catch crop material into the soil on soil organic matter storage, N mineralisation capacity and risk for N leaching. C and N dynamics in crop and soil were simulated with the SOILN model (Version 9.2). The simulated results were compared with measurements of crop and soil N, crop biomass and N-leaching from a catch crop field experiment situated in southwestern Sweden. The generality of parameter values determining the long-term turnover of soil organic matter was tested. To reproduce measured soil mineral N and crop N, mineralisation had to be favoured by high C mineralisation. After 6 years of catch crop treatment, simulated soil organic matter content had increased by less than 2%, but the N-mineralisation capacity had increased by 25%, corresponding to 37 kg N ha(-1). With a continuous annual use of catch crops only a few per cent of the extra mineralised N was leached. Without a succeeding catch crop, however, 30% of N from the increased mineralisation was leached. The results indicated that the decomposition rate increased immediately after frost events. (C) 2003 Elsevier Science Ltd. All rights reserved.

Nyckelord

catch crop systems; soil organic matter-storage; carbon and nitrogen interactions; long-term dynamics

Publicerad i

Agricultural Systems
2003, volym: 76, nummer: 1, sidor: 95-114

SLU författare

  • Eckersten, Henrik

    • Institutionen för ekologi och växtproduktionslära, Sveriges lantbruksuniversitet

  • Lewan, Elisabet

    • Institutionen för markvetenskap, Sveriges lantbruksuniversitet

UKÄ forskningsämne

Markvetenskap
Jordbruksvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1016/s0308-521x(02)00030-6

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/1280