isohumic en · ADJ
Etymology
From iso- + humic.
Meanings
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(not-comparable) Having the same, or uniform, percentage of humic acid.
Although present-day climates of central Europe are favourable to brunification and not to the formation of isohumic soils, in certain favourable sites in central and western Europe some partially brunified isohumic soils occur that are in fact polycyclic soils of biological origin and are entirely Postglacial, being characterised by two successive phases of humification: (i) an older phase of isohumic development; and (ii) a more recent phase of brunification.
2012, R. Duchaufour, Pedology: Pedogenesis and classification, →ISBN, page 247:The effectiveness of the material varies with the isohumic factor, which is the quantity of humus produced per unit of organic matter (Table 9.1; Kolenbrander 1974).
2009, R. P. C. Morgan, Soil Erosion and Conservation, →ISBN, page 200:The zonal distribution of soils developed under continental climates was first reported by Dokuchaev, who established in 1883 a map of isohumic curves, between the boreal and sub-arid zones of European Russia.
1996, A. Piccolo, Humic Substances in Terrestrial Ecosystems, →ISBN, page 58:Even farther north, subarid isohumic brown soils are present from Gourma to Gao (Mali), and in Niger.
2005, Inger Andersen, Katherin George Golitzen, The Niger River Basin: A Vision for Sustainable Management, →ISBN, page 23: