Effect of Compost Application on CO₂ and O₂ Concentrations in Sandy, Clay Loam and Clay Soils.

抄録

Most of the investigations in compost application have concentrated on the physical and biological characteristics of vegetation; little has been known about the gas phase in soil. In this study, the levels of CO₂ and 0₂ contents were associated with the effect of recycled compost application to sandy, clay loam and clay soils, respectively. Since a large amount of organic matter is correlated with the rise in CO₂ level especially in clay soil during the early stage of the decomposition process, it is expected that the rise in CO₂ greatly affects the O₂ content where the normal gas exchange within the soil is inhibited. Perforated aeration tubes were installed to determine the rate of gas exchange in soils treated with recycled compost. CO₂ problems were monitored at various soil depths and distances from the aeration tube. The levels of CO₂ in each soil increased significantly at depths and distances with values that ranged from 3-12%, 8-18% and 10-19.5% for sandy, clay loam and clay soils during the early stage of the study. The relationship between CO₂ and O₂ contents at any depths and distances shows an inverse linear relationship. Rates of gas exchange have been improved particularly in clay soil as a result of the installation of aeration tubes.