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Sequentially extracted phosphorus fractions in peat‐derived soils
Author(s) -
Schlichting André,
Leinweber Peter,
Meissner Ralph,
Altermann Manfred
Publication year - 2002
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/1522-2624(200206)165:3<290::aid-jpln290>3.0.co;2-a
Subject(s) - histosol , chemistry , peat , soil water , gleysol , humus , environmental chemistry , calcareous , organic matter , phosphorus , soil organic matter , soil science , environmental science , botany , organic chemistry , ecology , soil biodiversity , biology
Phosphorus (P) forms were sequentially extracted from peat derived soils (Eutric Histosols and Gleysols) at eight sites in Saxony‐Anhalt (Germany) to disclose general differences in P pools between mineral and organic soils and to investigate effects of peat humification and oxidation in conjunction with land use and soil management on the P status of soils. Overall 29 samples providing a wide variety of basic chemical properties were subjected to the Hedley fractionation. The Histosol topsoils contained more total P (P t ) (1345 ± 666 mg kg —1 ) than the Gleysol topsoils (648 ± 237 mg kg —1 ). The predominant extractable fractions were H 2 SO 4 ‐P (36—63 % of P t ) in calcareous and NaOH‐P o (0—46 % of P t ) in non‐calcareous Histosols. These soils had large pools of residual P (13—93 % of P t ). Larger contents and proportions of P o and of labile P fractions generally distinguished organic from mineral soils. Regression analyses indicated that poorly crystalline pedogenic oxides and organic matter were binding partners for extractable and non‐extractable P. Intensive management that promotes peat humification and oxidation results in disproportional enrichments of labile P fractions (resin‐P, NaHCO 3 ‐P i , and NaHCO 3 ‐P o ). These changes in P chemistry must be considered for a sustainable management of landscapes with Histosols and associated peat derived soils.