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Organic phosphorus species in humic acids of mountain soils along a toposequence in the Northern Caucasus
Author(s) -
Makarov Mikhail I.,
Guggenberger Georg,
Zech Wolfgang,
Alt Helmut G.
Publication year - 1996
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.1996.3581590509
Subject(s) - soil water , phosphorus , environmental chemistry , vegetation (pathology) , montane ecology , chemistry , humic acid , environmental science , ecology , soil science , biology , fertilizer , organic chemistry , medicine , pathology
Organic P was investigated in humic acids extracted from mountain soils developed in the subalpine, upper subalpine and alpine zones of the Northern Caucasus. P contents of humic acids varied between 3.4 and 14.2 g P kg −1 , depending on P contents of the parent vegetation and on site conditions. Organic P was accumulated at sites where microbial activity is restrained due to soil acidity, low soil temperature and hydromorphy. 31 P NMR spectroscopy revealed that orthophosphate monoesters were the dominent P species (72–85% of extract‐ able P), orthophosphate diesters amounted to 12–21%, and phospho‐ nates ranged between 0 and 9%. Humic acids of soils under cold and wet climatic conditions showed highest concentrations in phospho‐ nates and orthophosphate diesters. Hence, the accumulation of organo‐P in the Caucasian mountain soils was partly due to increasing proportions of potentially available organic P species.