Modeling methane fluxes in wetlands with gas-transporting plants. 1. Single-root scale

R. Segers, P.A. Leffelaar

Research output: Contribution to journalArticleAcademicpeer-review

26 Citations (Scopus)

Abstract

Methane dynamics in a water-saturated soil layer with gas-transporting roots is modeled with a weighed set of single-root model systems. Each model system consists of a soil cylinder with a gas-transporting root along its axis or a soil sphere with a gas-transporting root at its center. The weights associated with a different cylinder or sphere radius were deduced from root architecture. Methane dynamics in each single-root model system are calculated using a single-root model from the previous paper. From this full model a simplified model was deduced consisting of an oxygen-saturated and an oxygen-unsaturated model system. An even more simplified model was deduced, called the homogeneous model. In this model the concentrations are homogeneous in the whole soil layer. Simulation results of the simplified model are closer to the simulation results of the full model than the simulation results of the homogeneous model. The overall effect of the simplifications on simulated methane emissions are small, though the underlying processes are affected more severely, depending on simulation time and parameters. At high root densities and at large times, under stationary conditions, root density is proportional to simulated methane fluxes, provided that carbon availability is proportional to root density. Sensitivity analysis shows that lack of knowledge on root gas-transport is an important limitation for the predictability of methane fluxes via the processes at the kinetic level.
Original languageEnglish
Pages (from-to)3511-3528
JournalJournal of Geophysical Research
Volume106
DOIs
Publication statusPublished - 2001

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wetlands
Gas plants
Methane
Wetlands
methane production
methane
wetland
gases
Fluxes
gas
modeling
soils
Gases
Soils
soil
simulation
oxygen
root architecture
Oxygen
gas transport

Cite this

@article{8258828c1382413d86d69f6a955bb3ed,
title = "Modeling methane fluxes in wetlands with gas-transporting plants. 1. Single-root scale",
abstract = "Methane dynamics in a water-saturated soil layer with gas-transporting roots is modeled with a weighed set of single-root model systems. Each model system consists of a soil cylinder with a gas-transporting root along its axis or a soil sphere with a gas-transporting root at its center. The weights associated with a different cylinder or sphere radius were deduced from root architecture. Methane dynamics in each single-root model system are calculated using a single-root model from the previous paper. From this full model a simplified model was deduced consisting of an oxygen-saturated and an oxygen-unsaturated model system. An even more simplified model was deduced, called the homogeneous model. In this model the concentrations are homogeneous in the whole soil layer. Simulation results of the simplified model are closer to the simulation results of the full model than the simulation results of the homogeneous model. The overall effect of the simplifications on simulated methane emissions are small, though the underlying processes are affected more severely, depending on simulation time and parameters. At high root densities and at large times, under stationary conditions, root density is proportional to simulated methane fluxes, provided that carbon availability is proportional to root density. Sensitivity analysis shows that lack of knowledge on root gas-transport is an important limitation for the predictability of methane fluxes via the processes at the kinetic level.",
author = "R. Segers and P.A. Leffelaar",
year = "2001",
doi = "10.1029/2000JD900484",
language = "English",
volume = "106",
pages = "3511--3528",
journal = "Journal of Geophysical Research",
issn = "0148-0227",
publisher = "American Geophysical Union",

}

Modeling methane fluxes in wetlands with gas-transporting plants. 1. Single-root scale. / Segers, R.; Leffelaar, P.A.

In: Journal of Geophysical Research, Vol. 106, 2001, p. 3511-3528.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Modeling methane fluxes in wetlands with gas-transporting plants. 1. Single-root scale

AU - Segers, R.

AU - Leffelaar, P.A.

PY - 2001

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AB - Methane dynamics in a water-saturated soil layer with gas-transporting roots is modeled with a weighed set of single-root model systems. Each model system consists of a soil cylinder with a gas-transporting root along its axis or a soil sphere with a gas-transporting root at its center. The weights associated with a different cylinder or sphere radius were deduced from root architecture. Methane dynamics in each single-root model system are calculated using a single-root model from the previous paper. From this full model a simplified model was deduced consisting of an oxygen-saturated and an oxygen-unsaturated model system. An even more simplified model was deduced, called the homogeneous model. In this model the concentrations are homogeneous in the whole soil layer. Simulation results of the simplified model are closer to the simulation results of the full model than the simulation results of the homogeneous model. The overall effect of the simplifications on simulated methane emissions are small, though the underlying processes are affected more severely, depending on simulation time and parameters. At high root densities and at large times, under stationary conditions, root density is proportional to simulated methane fluxes, provided that carbon availability is proportional to root density. Sensitivity analysis shows that lack of knowledge on root gas-transport is an important limitation for the predictability of methane fluxes via the processes at the kinetic level.

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