不同水稻土中铁的微生物还原特性初步研究

Different paddy soils as tested samples, reduction status of difference soils was be determined under anaerobic incubation, and the ability of microbial iron reduction was be compared. Through the research of influence factors on methanogenesis, the inhibiting mechanism has to be made clear. The results show 1) Iron reduction can effectively consume methanogenesis medium—H2.and acetate. The addition of Fe(OH)3 may lead to reduce greatly H2 pressure, and may reduce the acetate concentration during early days of incubation, finally, may inhibit the production of methane. 2) By the determination of the reduction of NO3 -、SO4 2-、Fe（III）and methane roduction,the balance of electron transfer was be calculated. After adding Fe(OH)3 and lepidocrocite to paddy, the contribution (%) of electron-transfer belong to iron reduction were respectively.increased to 63.32% and 46.90% from 18.30% (control), however, the contribution (%) by methane production were respectively decreased to 35.85% and 52.32% from 80.92% (control). In anaerobic paddy, the contents of soil organic compound and microbe may affect the process of.iron reduction, and addition of organic acid may accelerate this process. 3) Iron reduction also may effectively affect the transform of organic compound and some contamination in soil.Addition of ferric oxide may also influence the production of CO2、N2O and the reduction transform of SO4 2-、Cr（VI）. Therefore iron reduction has important signification on soil environmental chemistry and bioremediation of contaminated soil.

采用室内厌氧恒温培育法研究我国不同水稻土中氧化铁的微生物还原特征，以纯培养实验校验土壤中氧化铁的还原程度。测定不同土壤中铁矿物形态、数量和种类。结合盆栽和田间试验，研究铁还原对甲烷排放的影响，为准确估算我国稻田甲烷排放量提供理论依据。探讨以氧化铁作为甲烷抑制剂的功效，评价氧化铁的生物安全性及其对土壤养分有效性的影响。.