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Studies on the humus forms of forest soils part 4 humus composition of fractionated horizons of forest soils



Studies on the humus forms of forest soils part 4 humus composition of fractionated horizons of forest soils



Soil Science and Plant Nutrition 23(4): 503-512



The results of humus composition analysis of each fraction separated physically from each horizon of 5 forest soils were presented. Regular changes in humus composition were observed with the gradation of horizons and with the decrease in particle size. Most of the humic acids from plant residual fractions belonged to the Rp type. Humic acids from the L layers showed a tannin-like character which disappeared with the progress of decomposition, and humic acids from the smaller particle fractions of the H layers contained a Pg [humus] fraction. As for humic acids from the A horizon, they all belonged to the P or B type and contained a Pg fraction. The humification process in the mineral layer was clearly different from that in the organic layer.

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