Organic phosphorus species in humic acids of mountain soils along a toposeauence in the Northern Caucasus

authored by

Mikhail I. Makarov, Georg Guggenberger, Wolfgang Zech, Helmut G. Alt

Abstract

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. ³¹P NMR spectroscopy revealed that orthophosphate monoesters were the dominent P species (72-85% of extractable P), orthophosphate diesters amounted to 12-21%, and phosphonates ranged between 0 and 9%. Humic acids of soils under cold and wet climatic conditions showed highest concentrations in phosphonates 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.

External Organisation(s)

Lomonosov Moscow State University
University of Bayreuth

Type

Article

Journal

Journal of Plant Nutrition and Soil Science

Volume

159

Pages

467-470

No. of pages

4

ISSN

1436-8730

Publication date

10.1996

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Soil Science, Plant Science

Electronic version(s)

https://doi.org/10.1002/jpln.1996.3581590509 (Access: Closed)