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Titolo:
SIMULATING TRENDS IN SOIL ORGANIC-CARBON IN LONG-TERM EXPERIMENTS USING THE DNDC MODEL
Autore:
LI CS; FROLKING S; CROCKER GJ; GRACE PR; KLIR J; KORCHENS M; POULTON PR;
Indirizzi:
UNIV NEW HAMPSHIRE,INST STUDY EARTH OCEANS & SPACE,MORSE HALL DURHAM NH 03824 NSW AGR,TAMWORTH CTR CROP IMPROVEMENT TAMWORTH NSW AUSTRALIA CRC SOIL & LAND MANAGEMENT GLEN OSMOND SA 5064 AUSTRALIA RES INST CROP PROD CZ-16106 PRAGUE 6 RUZYNE CZECH REPUBLIC ENVIRONM RES CTR D-06246 BAD LAUCHSTADT GERMANY IACR,DEPT SOIL SCI HARPENDEN AL5 2JQ HERTS ENGLAND
Titolo Testata:
Geoderma
fascicolo: 1-2, volume: 81, anno: 1997,
pagine: 45 - 60
SICI:
0016-7061(1997)81:1-2<45:STISOI>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROUS-OXIDE EVOLUTION; RAINFALL EVENTS; DRIVEN;
Keywords:
SOIL ORGANIC MATTER; MODELING; SOIL CARBON; LONG-TERM EXPERIMENTS;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
C.S. Li et al., "SIMULATING TRENDS IN SOIL ORGANIC-CARBON IN LONG-TERM EXPERIMENTS USING THE DNDC MODEL", Geoderma, 81(1-2), 1997, pp. 45-60

Abstract

Simulations of long-term (> 20 year) soil organic carbon (SOC) dynamics by the DNDC model were compared with field observations at 11 plotsin 5 field stations in Europe and Australia. The exercise was part ofa NATO-sponsored workshop on long-term monitoring and modeling of soil organic matter. Eight of the eleven plots were cultivated cropland and three were grassland (harvested for hay), There were a range of fertilizer and manure treatments, as well as crop rotation sequences. Significant loss in SOC was observed at two plots in Australia where a grassland had been converted to cultivated cropland in 1925. Both field data and model simulations showed the plots reaching a new SOC equilibrium at about 44% of the 1925 levels. Equilibrium levels depended on crop rotation sequence, with higher SOC for the plot with less frequentfallowing. At one permanent grassland site at Rothamsted, UK, a largedecline and recovery in SOC was observed in the field, but not in themodel simulation. For all other cases, both field and model data showed relatively small changes in SOC, though field data tended to be monvariable, perhaps due to variability in both crop and weed yield, andin residue management. Mean percent differences between simulated andmeasured SOC were 0.07% or less (as percent by weight, kilogram SOC/kilogram soil) for all but one of the plots simulated. (C) 1997 Elsevier Science B.V.

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Documento generato il 22/09/20 alle ore 12:58:03