水稲体における硫化水素の行動(第6報) : 水耕培養液中における H_2S の酸化に及ぼす鉄, pH 及び水稲根の影響

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It has been said that the rice plant roots would be able to oxidize hydrogen sulfide. which was generated in the paddy soil, by its oxidative action. Of this oxidation; we studied the autoxidation of hydrogen sulfide in the water culture solution. (1) The rate of oxidation of hydrogen sulfide was accelerated by addition of iron. and the maximum effect of this acceleration was observed in the culture solution of about pH 7. These results indicated that the oxidation of hydrogen sulfide occurred through the formation of Fe-H_2S intermediate complex : and the reaction of culture solution controlled the formation of this intermediate complex. (2) Oxidation of hydrogen sulfide in the culture solution was accelerated by the planting of rice plants. It would be seen that the effect of this planting was mainly due to the iron compounds precipitated on the root surface. The root surface was the active locality where hydrogen sulfide was oxidized. (3) It was considered, from these results, that there was competitive consumption of oxygen in culture solution between root respiration and hydrogen sulfide oxidation : and the harmful effect of hydrogen sulfide on the rice plant growth was partially caused by the deficiency in oxygen in accordance with the autoxidation of hydrogen sulfide.
社団法人日本土壌肥料学会の論文
1956-03-05