HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Ouyang, Y. Articles by Boersma, L. Search for Related Content PubMed Articles by Ouyang, Y. Articles by Boersma, L. Agricola Articles by Ouyang, Y. Articles by Boersma, L.

Dynamic Oxygen and Carbon Dioxide Exchange between Soil and Atmosphere: I. Model Development

Soil and Water Science Dep., Univ. of Florida, Gainsville, FL 32611

L. Boersma

Dep. of Crop and Soil Science, Oregon State Univ., Corvallis, OR 97331

*Corresponding author.

ABSTRACT

The rate of exchange of O₂ and CO₂ gases between soil and atmosphere is controlled by atmospheric and soil physical and biological conditions. Analysis and evaluation of problems in soil biology and soil ecology would be greatly facilitated by the availability of a mathematical model that predicts concentrations of these gases as a function of time and soil depth as well as the rate of gas exchange at the soil surface. Our objective was to develop such a model, driven by time-dependent functions for solar radiation, rainfall, air temperature, and relative humidity of the atmosphere. Outputs of the model include concentrations of CO₂ and O₂, soil water content, soil temperature, and rate of consumption of O₂ and production of CO₂ by roots and soil microorganisms, all as functions of time and soil depth. Dissolution of O₂ and CO₂ in soil water, adsorption of O₂ and CO₂ onto colloidal surfaces of soil particles, and replacement of air by water due to soil wetting and vice versa are accounted for in the model. Rates of respiration by microorganisms and roots and rate of root growth are given as functions of O₂ and CO₂ concentrations. Not all of the processes or parameters could be included in the model development because of their large number and complexity. The structure of the model consists of time-dependent simultaneous equations for vertical transport of water, heat, O₂, and CO₂ through unsaturated soils. Finite difference methods are used to solve the mathematical model.

Contribution from the Oregon Agric. Exp. Stn.

Received for publication April 12, 1991.

This article has been cited by other articles:

				J.-B. Chung, S.-H. Kim, B.-R. Jeong, and Y.-D. Lee Removal of Organic Matter and Nitrogen from River Water in a Model Floodplain J. Environ. Qual., May 1, 2004; 33(3): 1017 - 1023. [Abstract] [Full Text] [PDF]

				M. L. Rockhold, R. R. Yarwood, and J. S. Selker Coupled Microbial and Transport Processes in Soils Vadose Zone J., May 1, 2004; 3(2): 368 - 383. [Abstract] [Full Text] [PDF]