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Formalized analysis of associativity of morphogenetic types and humus condition of ground litter in marsh birch forests


There are six morphogenetic types of forest ground litter in the gradient of big grass-sphagnous-dead litter marsh birch forest: deeply degraded litter, half degraded litter, rhizomatous litter (coarsely degraded), peaty litter, turfy-formed litter, and turfy litter. The specificity of their biochemical transformations is caused by the accumulation of humic acids (HA), especially of the first fraction (HA-1), alongside the relatively steady background formation of fulvic acids. The C/N value suggests that the intensity of HA-1 formation is closely associated with the biological activity of the substrate. However, the indistinct difference of these parameters in the forestry-morphological types of litters limits their diagnostic reliability. Grouped biochemical types of litters, such as “soft” (half- and deeply degraded), “intermediate” (rhizomatous, peaty and turfy-formed), and “coarse” (mossy), are considerably discriminated by both the C/N ratio (20, 30, 40) and the level of HA-1 (14, 10, and 6%) respectively.

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Correspondence to T. T. Efremova.

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Original Russian Text © T.T. Efremova, A.F. Avrova, S.P. Efremov, 2013, published in Sibirskii Ekologicheskii Zhurnal, 2013, No. 5, pp. 751–760.

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Efremova, T.T., Avrova, A.F. & Efremov, S.P. Formalized analysis of associativity of morphogenetic types and humus condition of ground litter in marsh birch forests. Contemp. Probl. Ecol. 6, 569–577 (2013).

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  • marsh birch forests
  • litter types
  • fraction-group composition of the organic matter