Abstract

A detailed study of Albic Stagnosols and Eutric Gleysols that are widely used in agriculture of the Far East and are characterized by the active formation of iron–manganese nodules has shown differences in their physicochemical and optical properties and biological activity parameters. The level of catalase activity in the studied soils is relatively low. Soils with a higher content of C_tot are characterized by low integral reflectivity. Differences in the optical parameters of the studied soils and nodules have been identified in the CIE-L*a*b* system. In comparison with the soil mass, the nodules display a closer relationship between optical parameters, a lower L* value, and a higher b* value. In both soils, the nodules are characterized by the high catalytic activity. A close negative correlation is observed between the values of catalytic activity and integral reflectivity. The results of our study attest to the significant role of nodules in the carbon accumulation in soils. An enhanced catalase and catalytic activity and formation the numerous zones of carbon accumulation within the nodules are specific features of nodules from Eutric Gleysols (Aric). The carbon-rich zones are active centers of oxidation of elements with variable valence, which contributes to the formation of larger nodules in these soils.

中文翻译：

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滨海边疆区南部农田土壤中的细土和结核：理化和光学特性、过氧化氢酶和催化活性

摘要

对广泛用于远东农业并以铁锰结核活跃形成为特征的 Albic Stagnosols 和 Eutric Gleysols 的详细研究表明，它们的物理化学和光学特性以及生物活性参数存在差异。所研究土壤中过氧化氢酶活性水平相对较低。C _tot含量较高的土壤的特点是积分反射率低。在CIE-L*a*b*系统中已经确定了所研究土壤和结核的光学参数的差异。与土壤质量相比，结核的光学参数关系更密切，L * 值较低，b值较高* 价值。在这两种土壤中，结核的特点是具有高催化活性。在催化活性值和积分反射率之间观察到密切的负相关。我们的研究结果证明了结核在土壤碳积累中的重要作用。增强的过氧化氢酶和催化活性以及在结核内形成众多碳积累区是来自 Eutric Gleysols (Aric) 的结核的特定特征。富碳区是价态可变的元素氧化的活跃中心，有助于在这些土壤中形成更大的结核。