Abstract

Authors

Mizoguchi, Y., Ohtani, Y., Watanabe, T.

Year

2005

Title

Influence of Soil Temperature and Moisture on Forest Floor CO₂ Efflux -Clarification of the Effect of Soil Moisture using Field Data-

Journal

Journal of agricultural meteorology

Volume

60(5)

Page

761-764

DOI

-

Keywords

CO₂ efflux from a forest floor, CO₂ production, diffusion, soil moisture, soil temperature

URL

-

Abstract

Both soil temperature and water content are important environmental factors in determining CO₂ efflux from a forest floor. To analyze the effects of soil temperature and water content on soil CO₂ efflux based on field data, these elements were measured in a temperate deciduous forest. CO₂ concentration, air porosity, volumetric water content, the diffusion coefficient and CO₂ production rate were also measured. CO₂ efflux was separated into CO₂ transfer and CO₂ production processes using the diffusion coefficient, CO₂ concentration and CO₂ production rate data. Both the CO₂ transfer and CO₂ production rates increasing soil temperature. The CO₂ transfer rate decreased when the difference between CO₂ concentration at surface and that in soil was nearly constant and the CO₂ production rate increased with increasing soil moisture. On the other hand, the CO₂ efflux, which represents the sum of the CO₂ transfer rate and CO₂production rate, might increase with increasing soil moisture, when the difference in CO₂ concentration is small and consequently the decreasing rate of CO₂ transfer is low. To clarify the soil moisture effects on forest floor CO₂ efflux, separation of CO₂ transfer and CO₂ production processes is more effective than direct parameterization of CO₂ efflux by soil moisture.

Site

KWG

Remarks

-