| As an important part of geochemistry cycles, the dissimilatory iron reduction in paddy soil is a biological process catalyzed by microorganisms. In order to study the influnce of different electron donors on microbial iron reduction in paddy soil, glucose, acetate, pyruvate and lactate was added to the anaerobic slurry of different paddy soils which were cultured under constant temperature. The accumulation of Fe（Ⅱ） and pH was monitored at regular intervals, and the test data were fitted and analyzed by Logistic model. The results showed that the four kinds of paddy soils can make good use of glucose, pyruvate and lactate to reduce Fe（Ⅲ） as carbon sources, while acetate inhibited the reduction of Fe（Ⅲ）, especially in Jilin paddy soil. The treatments with pyruvate had the maximum Fe（Ⅲ） reduction rate（Vmax） in all the four types of paddy soils, and took the shortest time to reach Vmax. Microorganisms from different paddy soil had a certain selective to carbon sources. The main factor that influences the potential capacity of reducing Fe（Ⅲ） in paddy soil is the content of amorphous iron. High content of soil total phosphorus also inhibited the process of iron reduction. Besides, there was a negative correlation between pH and the concentration of Fe（Ⅱ） in the incubation system with carbon sources. |
