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通过对长期施化肥及化肥与紫云英、稻草、猪粪配施处理下红壤稻田各粒级团聚体内氧化铁分布特征的研究,探讨不同施肥方式下各粒级团聚体内氧化铁形态与有机碳含量的关系。结果表明,长期施化肥及化肥与紫云英、稻草、猪粪配施增加了土壤中无定形铁Feo含量(增幅达10.5%~58.5%),降低了土壤中游离铁Fed的含量(降幅为0.4%~13.8%),土壤中氧化铁的活度Feo/Fed提高了19%~76%。各粒级团聚体内Feo含量表现为:250~53μm>(<53μm)>2 000~250μm,Fed含量表现为:250~53μm>2 000~250μm>(<53μm),Feo/Fed表现为:(<53μm)>250~53μm>2 000~250μm。全土和各粒级团聚体内Feo含量及其Feo/Fed与其相应的有机碳含量均呈显著正相关(P<0.05,相关系数分别为:r=0.953~0.779和r=0.991~0.823),而Fed含量与其相应的有机碳含量呈显著负相关(P<0.05,r=0.964~0.651)。有机物料的投入能活化氧化铁,有机质投入量最大的化肥配施猪粪处理Feo含量及Feo/Fed显著提高。
Through the study on the distribution characteristics of iron oxide in each size aggregate of red soil paddy with long-term application of chemical fertilizers and chemical fertilizers combined with milk vetch, straw and pig manure, the effects of different forms of iron oxide and organic carbon Content of the relationship. The results showed that the long-term application of fertilizers and chemical fertilizers combined with milk vetch, straw and pig manure increased the Feo content of amorphous iron in the soil (an increase of 10.5% -58.5%), and decreased the content of free iron Fed in the soil 0.4% ~ 13.8%), FeO / Fed of iron oxide in soil increased by 19% -76%. The Feo content in the aggregates of each size ranged from 250 to 53 μm> (<53 μm)> 2,000 to 250 μm, and the Fed contents were as follows: 250 to 53 μm> 2,000 to 250 μm> (<53 μm) <53 μm)> 250-53 μm> 2,000-250 μm. There was a significant positive correlation between Feo content and its Feo / Fed and its corresponding organic carbon content (P <0.05, r = 0.953 ~ 0.779 and r = 0.991 ~ 0.823, respectively) (P <0.05, r = 0.964 ~ 0.651). The input of organic material can activate iron oxide, and the Feo content and Feo / Fed of fertilizers combined with pig manure with the highest input of organic matter are significantly increased.