Redox potential has principal
influences on formation and attribute of soils and it is necessary to research
the measurement of soil redox potential.The self-made potentiometer and two
indigenous FJA-5 potentiometers were employed to measure the Eh values of fir
forest soils in situ,which lied in Savage Sea Beauty Spot
in SichuanProvince.Simultaneously fresh soils in situ were
collected and made into suspensions with various soil-water ratios and
standing time to measure Eh values.The results demonstrated that the total tendency of Eh values measured by
the self-made potentiometer was gradually falling with soil-water ratios
increasing and standing time prolonging.There is a great difference between Eh
values measured in laboratory and in situ.Only in situ may the measured Eh values show realistic oxidation-reduction
conditions and formation characteristics of forest soil.The self-made potentiometer has a
preferable performance than indigenous FJA-5 potentiometers and it can be
applied to measuring forest soil Eh in
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