中文摘要：

采用室内培养试验，在确定模拟硝田土壤硫酸钠含量的基础上，观测并探讨落干／淹水状况、有机物质种类与数量对模拟硝田土壤铁和硫形态转化特征的影响。结果表明：全铁（Fet）和游离铁（Fed）受落干／淹水状态和有机物质种类与数量的影响均不显著，而活性铁（Feo）、络合铁（Fep）、亚铁离子（Fe（II））及有效铁（Fea）受淹水及有机物质数量的显著影响，Fe（II）、Fea还受有机物质种类的显著影响；硫形态转化同时受淹水及有机物质种类与数量的影响；土壤铁、硫形态转化一方面通过有机物质与铁、硫的直接作用实现，一方面通过改变土壤氧化还原电位（Eh）及还原性物质总量（TARM）等氧化还原状况实现；铁与硫的形态转化也表现出一定的耦合关系。

英文摘要：

In an indoor incubation experiment, Na2SO4 contents of simulated mirabilite soil were determined, and then theeffects of drying-submergence and different kinds and quantities of organic substances on Fe and S transformation in the soil wereobserved and discussed. The results showed that drying/submergence and organic substances had no significant effect on Fet andFed. However, submergence and the quantities of organic substances had significant effects on Feo, Fep, Fe（ II ） and Fea.Moreover, Fe（ II） and Fea were significantly affected by organic substances as well. Submergence and organic substance bothcould promote S transformation in the soil. Fe and S transformation was realized by direct reaction of organic substance, on theother hand, by changing the conditions of soil redox regime including Eh and TARM. Besides, there was a coupling relationshipbetween the transformation of different forms of Fe and S in the soil.