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A quantitative assessment of forest humus forms is suggested, on the basis of a scale ranging from 1 (Eumull) to 7 (Dysmoder) which is called the humus index Regression analyses showed that this index was well‐correlated with several morphological as well as chemical variables describing forest floors and topsoil profiles: thickness of the Oe horizon, depth of the crumby mineral horizon, Munsell hue, pH KCl and pH H2O , H and Al exchangeable acidity, percentage base saturation, cation‐exchange capacity, exchangeable bases, C and N content and available P of the A horizon. The suggested humus index could be used as a cheap and rapid method for the bulk assessment of organic matter accumulation, soil acidity, and soil biological activity.
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Ponge et al. (2002) studied this question.
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