A Model of Production and Turnover of Roots in Shortgrass Prairie

Parton, William J.; Singh, Jaya; Coleman, David C.

doi:10.2307/2402608

Cited by 39 publications

(27 citation statements)

References 44 publications

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“…The major changes to the ForCent model include: (1) adding a surface litter slow organic matter pool (humus layer); (2) altering the surface litter decay submodel; (3) adding the Parton et al [1978] root growth model; (4) adding a plant stored carbohydrate pool; and (5) including the impact of phenology on seasonal plant growth patterns. The ForCent model divided the slow pool into a surface slow pool (humus) and a mineral soil slow pool (see Figure 2).…”

Section: Methodsmentioning

confidence: 99%

“… Riley et al [2009] suggest that juvenile roots have turnover times <1.0 year, while mature roots have turnover times >10.0 years. The ForCent model has incorporated a revised version of the Parton et al [1978] root growth model (Figure 3). The main structural change for the ForCent root model was to combine the juvenile and nonsuberized roots into juvenile roots, and then refer to the suberized roots as mature roots.…”

Section: Methodsmentioning

confidence: 99%

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ForCent model development and testing using the Enriched Background Isotope Study experiment

et al. 2010

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The ForCent forest ecosystem model was developed by making major revisions to the DayCent model including: (1) adding a humus organic pool, (2) incorporating a detailed root growth model, and (3) including plant phenological growth patterns. Observed plant production and soil respiration data from 1993 to 2000 were used to demonstrate that the ForCent model could accurately simulate ecosystem carbon dynamics for the Oak Ridge National Laboratory deciduous forest. A comparison of ForCent versus observed soil pool C-14 signature (Delta C-14) data from the Enriched Background Isotope Study C-14 experiment (1999-2006) shows that the model correctly simulates the temporal dynamics of the C-14 label as it moved from the surface litter and roots into the mineral soil organic matter pools. ForCent model validation was performed by comparing the observed Enriched Background Isotope Study experimental data with simulated live and dead root biomass Delta C-14 data, and with soil respiration Delta C-14 (mineral soil, humus layer, leaf litter layer, and total soil respiration) data. Results show that the model correctly simulates the impact of the Enriched Background Isotope Study C-14 experimental treatments on soil respiration Delta C-14 values for the different soil organic matter pools. Model results suggest that a two-pool root growth model correctly represents root carbon dynamics and inputs to the soil. The model fitting process and sensitivity analysis exposed uncertainty in our estimates of the fraction of mineral soil in the slow and passive pools, dissolved organic carbon flux out of the litter layer into the mineral soil, and mixing of the humus layer into the mineral soil layer

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

ForCent model development and testing using the Enriched Background Isotope Study experiment

et al. 2010

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“…These correlations may, however, be driven by more than surface litter. Since a large portion of fixed C is transported into the rhizosphere in grasses (Parton et al, 1978;Oades, 1988), rhizosphere C in meadows may have covaried with surface litter.…”

Section: Carbonmentioning

confidence: 99%

Conifer invasion of forest meadows transforms soil characteristics in the Pacific Northwest

Griffiths

Madritch

Swanson

2005

Forest Ecology and Management

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“…If they used the model published by Parton et al (1978), then we assume that additional root data were collected to verify that simulation model. If they used the model published by Parton et al (1978), then we assume that additional root data were collected to verify that simulation model.…”

mentioning

confidence: 99%