J. Jpn. Soc. Soil Phys.
#M 87
No. 30, p. 0/1* ,**.

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T-C amount in soil aggregates under di#erent pressures
following substrate incorporation
Yoshiko MUTO*, Kunio WATANABE* and Akira SHINJO** Faculty of Bioresources, Mie University, +/+/ Kamihama, Tsu, Mie /+.ῌ2/*1, Japan
Abstract
With the growing concern over the sustainable use of soil organic matter, it is important toknow the relationship between microbial activity and the physics of soil. This study measuredchanges in the T-C in soil aggregate and crushed aggregate at sub-atmospheric and atmosphericpressures, following substrate incorporation, to examine the e#ect of decompression on microbialactivity in soil. The T-C decreased rapidly in the beginning and decreased more slowly at latertime stages.

The decrease in T-C varied with pressure.

The decrease in T-C was greatest at agauge pressure of approximately ,* kPa. The decrease also di#ered between the aggregate
and crushed aggregate samples.

These results suggest that the chemical potential of soil waterchanges with decompression, a#ecting the vital activity of microbes.

Furthermore, soil aggre-gates play an important role in this activity.
Key words : Decompression, Total carbon amount, Microbe, Soil water, Soil aggregate

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were placed under di#erent gauge pressure
for +/ days.

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