【摘要】 研究鄱阳湖典型湿地不同层次土壤铁的形态分布特征,为土壤铁污染提供理论依据。根据土壤类型及地形位置采集了表层土壤和典型土壤剖面土样,采样范围涵盖了鄱阳湖95%以上的湿地,采用BCR三步法测定铁的可交换态及碳酸盐结合态(弱酸溶解态)、Fe/Mn氧化物结合态(可还原态)、有机物及硫化物结合态(可氧化态)和残渣态的含量,讨论并分析鄱阳湖典型土壤中总铁和各形态铁的分布特征。结果表明:各采样点土壤总铁的含量差异不大,铁形态以残渣态为主,其次是可还原态,占总铁的比例范围分别为76.96%~90%和9.68%~14.41%,可氧化态含量相对较低,酸可提取态含量最低。相关分析表明,各形态与总铁含量之间存在极显著的相关性。前3种形态铁的含量受土壤中p H和Eh的影响较大。从垂直分布来看,4个样点的各形态含量随深度的变化没有明显的规律。更多还原

【Abstract】 To provide a theoretical basis for the theory of soil pollution,iron of typical wetland soil was studied in this paper. The top soil and typical profile soil samples were collected based on soil types and geographic position. The sampling range covered more than 95% of Poyang Lake wetland. Contents of weak dissolution,reducible,oxidizable and residual iron were analysised by BCR. Total iron and different iron forms of Poyang Lake wetland soil were analysised and discussed. The results showed that the contents of different iron forms had no significant difference,the follow order was residual fraction > resucible > oxidizable > acid extractable,percentages of residual fraction and resucible iron were 76. 96%-90% and 9. 68%-14. 41% respectively. The contents of different ironforms had significant correlation with the content total iron,and the first three iron forms were affected by p H and Eh. The vertical distribution of iron forms were not distinct regularity.更多还原