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Titolo:
SIMULATING TRENDS IN SOIL ORGANIC-CARBON IN LONG-TERM EXPERIMENTS USING THE SOIL-PLANT-ATMOSPHERE MODEL DAISY
Autore:
JENSEN LS; MUELLER T; NIELSEN NE; HANSEN S; CROCKER GJ; GRACE PR; KLIR J; KORSCHENS M; POULTON PR;
Indirizzi:
ROYAL VET & AGR UNIV,DEPT AGR SCI,THORVALDSENSVEJ 40 DK-1871 FREDERIKSBERG C DENMARK NSW AGR,TAMWORTH CTR CROP IMPROVEMENT TAMWORTH NSW 2340 AUSTRALIA CRC SOIL & LAND MANAGEMENT GLEN OSMOND SA 5064 AUSTRALIA RES INST CROP PROD CZ-16106 PRAGUE 6 RUZYNE CZECH REPUBLIC UFZ,LEIPZIG HALLE GMBH,SEKT BODENFORSCH BAD LAUCHSTADT D-06246 BAD LAUCHSTADT GERMANY IACR ROTHAMSTED HARPENDEN AL5 2JQ HERTS ENGLAND
Titolo Testata:
Geoderma
fascicolo: 1-2, volume: 81, anno: 1997,
pagine: 5 - 28
SICI:
0016-7061(1997)81:1-2<5:STISOI>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
MICROBIAL BIOMASS; NITROGEN DYNAMICS; MATTER; TURNOVER; WHEAT; PLOTS;
Keywords:
MODELING; SOIL ORGANIC MATTER; LONG-TERM; SOIL C; MODEL PARAMETERIZATION;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
L.S. Jensen et al., "SIMULATING TRENDS IN SOIL ORGANIC-CARBON IN LONG-TERM EXPERIMENTS USING THE SOIL-PLANT-ATMOSPHERE MODEL DAISY", Geoderma, 81(1-2), 1997, pp. 5-28

Abstract

DAISY, a mechanistic model for the simulation of crop production, soil water and N dynamics in agro-ecosystems, was used for simulating trends in total soil carbon (C) for various long-term experiments as partof a model evaluation exercise. Of the seven core datasets in the global SOMNET database, DAISY could be applied to the four arable sites and, with certain critical assumptions, to the single grassland site. The model was, however, not applicable to the two forest sites, becausecurrently DAISY cannot simulate soil water and temperature dynamics in a forest system and does not incorporate leaching of dissolved organic substances, faunal litter incorporation or the effect of low pH on decomposition. The DAISY crop submodel produced some overestimation ofcrop yields, especially at low N input levels, and simulated root C input to the soil may thus represent a slight overestimation. This may have been balanced, however, by the fact that no account is taken of rhizodeposition or root turnover in the current version of the DAISY model. For this reason too, plant-derived C input in perennial crops (pastures) had to be estimated and input separately. Under these criticalassumptions, the model was capable of simulating long-term trends in total soil C quite well for all included sites and treatments (overallcorrelation, R-2 = 0.86), except for the Bad Lauchstadt arable site. It was evident that sufficient experimental data on belowground, plant-derived C inputs was not available, especially with perennial crops. Future research in this area should thus have high priority, because such data are a prerequisite if soil organic matter models are to incorporate and improve the simulation of this very important mechanism of soil C input, The partitioning and parameterisation of C between poolsin the DAISY model has been discussed and indications were found thatthe parameterisation of the microbial biomass pools in the model are somewhat inadequate. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 14:27:00