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为了解不同类型水稻土中氧化铁含量特征,探明添加外源聚合氨基酸对水稻土中氧化铁形态变化的影响,本研究以中国北方不同类型水稻土(棕壤型、草甸土型和滨海盐渍型)为研究对象,设置添加占供试土壤干重0.05%的γ-聚谷氨酸和聚天冬氨酸处理,以不添加氨基酸作为对照。通过室内恒温厌氧培养30 d后,测定各水稻土全铁、游离氧化铁、无定形氧化铁和络合态铁含量及氧化铁的活化和络合程度。结果表明:供试的北方3种典型水稻土中,游离氧化铁含量为滨海盐渍型>草甸土型≥棕壤型,络合态铁含量为棕壤型>滨海盐渍型≥草甸土型,而无定形氧化铁含量为棕壤型>滨海盐渍型>草甸土型。两种外源聚合氨基酸对不同类型水稻土氧化铁形态转化能力影响存在差异,与不添加氨基酸的对照相比,添加γ-聚谷氨酸的棕壤型水稻土无定形氧化铁和络合态铁含量分别增加27.72%和32.25%,聚天冬氨酸对无定形氧化铁和络合态铁含量无显著促进作用;在草甸土型水稻土中,γ-聚谷氨酸和聚天冬氨酸均能显著增加无定形氧化铁含量,且与对照相比,络合态铁含量分别增加136.24%和12.00%;γ-聚谷氨酸能有效促进滨海盐渍型水稻土中无定形氧化铁和络合态铁的生成。总之,添加γ-聚谷氨酸和聚天冬氨酸对水稻土游离氧化铁的含量没有明显影响;而添加γ-聚谷氨酸能有效增加水稻土中无定形氧化铁和络合态铁含量,降低晶胶率,有利于提高土壤中有效铁含量,显著活化铁氧化物,抑制各类型水稻土中铁的结晶老化;而聚天冬氨酸对水稻土无定形氧化铁和络合态铁没有明显的激发效应。
In order to understand the characteristics of iron oxide content in different types of paddy soils and to explore the effects of adding exogenous polymeric amino acids on the morphological changes of iron oxides in paddy soils, this study studied the effects of different types of paddy soils (brown soil type, meadow soil type, Saline-type) as the research object, set to add the test soil dry weight of 0.05% γ-polyglutamic acid and polyaspartic acid treatment, without adding amino acids as a control. After anaerobic incubation at room temperature for 30 days, the contents of total iron, free iron oxide, amorphous iron oxide and complexation iron in each paddy soil and the activation and complexation of iron oxide were determined. The results showed that the content of free iron oxide in coastal three typical paddy soils was coastal salinization type> meadow type ≥ brown soil type, and the content of complexated iron was brown soil type> coastal salinization type ≥ meadow Soil type, and amorphous iron oxide content of brown soil type> coastal saline type> meadow soil type. The effects of two kinds of exogenous polymeric amino acids on morphological transformation ability of different types of paddy soil were different. Compared with the control without adding amino acids, the brown soil paddy soil with γ-polyglutamic acid had amorphous iron oxide and complexation state The content of iron increased by 27.72% and 32.25% respectively. Polyaspartic acid had no significant effect on the content of amorphous iron and complexed iron. On the meadow soil paddy soil, γ-polyglutamic acid and polyaspora Amino acid could significantly increase the content of amorphous iron oxide, and the content of iron in complexed state increased by 136.24% and 12.00%, respectively compared with the control; γ-polyglutamic acid could effectively promote the amorphous oxidation in coastal saline paddy soil Iron and the formation of complex iron. In summary, the addition of γ-polyglutamic acid and polyaspartic acid had no significant effect on the content of free iron oxide in paddy soil; however, the addition of γ-polyglutamic acid could effectively increase the content of amorphous iron oxide and complex iron Content, reduce the rate of crystal gum, help to improve the effective iron content in soil, significantly activate iron oxide, inhibit the various types of paddy soil iron crystallization aging; and polyaspartic acid paddy soil amorphous iron oxide and complex iron No obvious stimulating effect.