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TRANSCRIPT
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Behaviors of CO, and O, Gases in a Field Soil with a Hard Pan
Tomonori FUJIKAWA*
Department of Biological and Environmental Engineering, The University of Tokyo, +�+�+ Yayoi,Bunkyo-ku, Tokyo ++-�20/1, Japan
Abstract
Gas concentration in the soil air is di#erent from that in atmosphere, because it is a#ected by
activity of microorganisms, gas di#usion and chemical reaction. Under the field condition for
cultivation, large changes in soil physical properties by human operations may a#ect the gas
behavior in the soil. The objective of this study is to clear gases behaviors in the soil from field
measurements, column experiments and simulations.
Under field condition, CO, and O, gas concentrations in the deeper layer than the hard pan
changed remarkably with seasons, whereas those concentrations in the top layer changed little.
From the column experiments, CO, gas concentrations in the top layer increased with infiltration,
whereas CO, gas concentrations decreased both in the other layers and in the atmosphere. The
changes of O, gas concentrations after infiltrations are opposite to those of CO, gas. Simulation
with measured gas CO, gas concentration of column experiment suggested that the activity of
microorganisms at the hard pan might be larger, and also, prevention of gas movement above the
hard pan or large flux of gas through the top layer might be keep CO, gas concentration low in the
top layer. It was concluded that gas concentrations changes above and below the hard pan,
because the hard pan a#ects the activity of microorganisms and gas di#usion.
Key words : soil gas, field soil, hard pan
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+332 ; Sotomayor and Rice, +333,1 S�5�]^Z:�n/dstjkAB�'(JK�E�N� n�ud23�>v45tvwAxy ���-� '(JK�z{?|}Az~��'(_`ef�t9w*��A:�C��*�123#�'(JK:� 23��d���� 23���AB����B���� '(_`��Az~D���K� CO,'(���A���������� ����Az~D�(���� 2������ A¡¢N£p��x¤5��-� CO,� O,'(AL �:� �(���d�� -¥¦Z0�S�-§5����¨?� '(�
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field.
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microorganisms.
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