Phosphorus status of humic acids in mountain soils of the North-Western Caucasus [Russian Feleration]
1995
Makarov, M.I.
Humic acids (HA) derived from A horizons of soils situated in the forest, subalpine and alpine zones on the Mt. Malaia Khatipara (Teberda Reserve, North-Western Caucasus) between 1400 m and 2750 m a. s. I. were studied by 31P NMR spectroscopy and chemical analysis. HA from forest and subalpine meadow soils are characterized by ranges of P content between 0.31 and 0.50 %, while HA from alpine soils contain 0,51 - 1,42 % P. Phosphate monoesters comprise the major part of HA's P (72 - 85 %), diesters are relatively low (12 - 21 %), and phosphonates range between 0 and 9 %. P content in HA of alpine soils is in clear correlation with both the moisture conditions and P content in overground litterfall, but is not with the rate of litterfall mineralization
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