The ROL of wetland plants was measured using the modified method of Armstrong (1964, 1967). The instruments used in
the experiment included a polarograph, a cylindrical platinum electrode, an Ag/AgCl electrode, and a list-style recorder. Roots
of similar size and length (about 1 mm in diameter and 10 cm in length) from each wetland were nondestructively measured
at the point 0.5 cm from root tip. Measurement of the electric current was started as soon as a balanced voltage was set. The
ROL was calculated using the formula: ROL ¼ nFA/i, where ROL is the external O2 flow rate (ng cm2 min1); i is the electric
current shown by the polarograph (mA); n is the number of electrons for deoxygenating one molecular oxygen, set at 4; F is
Faraday’s constant 96,500; A is the surface area of the root within the cylindrical platinum electrode (cm2). The ROL was
measured on sunny days during July (summer), October (autumn), and January (winter)
The ROL of wetland plants was measured using the modified method of Armstrong (1964, 1967). The instruments used inthe experiment included a polarograph, a cylindrical platinum electrode, an Ag/AgCl electrode, and a list-style recorder. Rootsof similar size and length (about 1 mm in diameter and 10 cm in length) from each wetland were nondestructively measuredat the point 0.5 cm from root tip. Measurement of the electric current was started as soon as a balanced voltage was set. TheROL was calculated using the formula: ROL ¼ nFA/i, where ROL is the external O2 flow rate (ng cm2 min1); i is the electriccurrent shown by the polarograph (mA); n is the number of electrons for deoxygenating one molecular oxygen, set at 4; F isFaraday’s constant 96,500; A is the surface area of the root within the cylindrical platinum electrode (cm2). The ROL wasmeasured on sunny days during July (summer), October (autumn), and January (winter)
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