Micro-scale heterogeneity of soil phosphorus depends on soil substrate and depth
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Dokumenter
- Micro-scale heterogeneity of soil phosphorus depends on soil substrate and depth
Forlagets udgivne version, 1,99 MB, PDF-dokument
Soils comprise various heterogeneously distributed pools of lithogenic, free organic, occluded, adsorbed, and precipitated phosphorus (P) forms, which differ depending on soil forming factors. Small-scale heterogeneity of element distributions recently has received increased attention in soil science due to its influence on soil functions and soil fertility. We investigated the micro-scale distribution of total P and different specific P binding forms in aggregates taken from a high-P clay-rich soil and a low-P sandy soil by combining advanced spectrometric and spectroscopic techniques to introduce new insights on P accessibility and availability in soils. Here we show that soil substrate and soil depth determine micro-scale P heterogeneity in soil aggregates. In P-rich areas of all investigated soil aggregates, P was predominantly co-located with aluminium and iron oxides and hydroxides, which are known to strongly adsorb P. Clay minerals were co-located with P only to a lesser extent. In the low-P topsoil aggregate, the majority of the P was bound organically. Aluminium and iron phosphate predominated in the quartz-rich low-P subsoil aggregate. Sorbed and mineral P phases determined P speciation in the high-P top- and subsoil, and apatite was only detected in the high-P subsoil aggregate. Our results indicate that micro-scale spatial and chemical heterogeneity of P influences P accessibility and bioavailability.
Originalsprog | Engelsk |
---|---|
Artikelnummer | 3203 |
Tidsskrift | Scientific Reports |
Vol/bind | 7 |
Udgave nummer | 1 |
ISSN | 2045-2322 |
DOI | |
Status | Udgivet - 1 dec. 2017 |
Eksternt udgivet | Ja |
Antal downloads er baseret på statistik fra Google Scholar og www.ku.dk
ID: 239160430