Land use and soil factors affecting accumulation of phosphorus species in temperate soils

TY - JOUR

T1 - Land use and soil factors affecting accumulation of phosphorus species in temperate soils

AU - Stutter, Marc I.

AU - Shand, Charles A.

AU - George, Timothy S.

AU - Blackwell, Martin S A

AU - Dixon, Liz

AU - Bol, Roland

AU - MacKay, Regina L.

AU - Richardson, Alan E.

AU - Condron, Leo M.

AU - Haygarth, Philip M.

PY - 2015/11/1

Y1 - 2015/11/1

N2 - Data on the distribution of phosphorus (P) species in soils with differing land uses and properties are essential to understanding environmental P availability and how fertiliser inputs, cropping and grazing affect accumulation of soil inorganic P (Pi) and organic P (Po) forms. We examined thirty-two temperate soils (with soil organic C concentrations 12-449gCkg-1 and total P 295-3435mgPkg-1) for biogeochemical properties of soil C, reactive surfaces and P by common indices and 31P-NMR spectroscopy on NaOH-EDTA extracts for P species. Arable soil P was dominated by inorganic orthophosphate (276-2520mgPkg-1), >monoester P (105-446mgPkg-1). The limited diesters, polyphosphates and microbial P in arable soils suggest that cropping and fertiliser inputs limit ecosystem microbial functions and P diversity. Intensive grassland had inorganic orthophosphate concentrations (233-842mgPkg-1) similar to monoesters (200-658mgPkg-1)>diesters (0-50mgPkg-1) and polyphosphates (1-78mgPkg-1). As grazing became more extensive P in semi-natural systems was dominated by organic P, including monoesters (37-621mgPkg-1) and other diverse forms; principally diester (0-102mgPkg-1) and polyphosphates (0-108mgPkg-1). These were related to SOC, water extractable organic carbon (WEOC) and microbial P, suggesting strong microbially-mediated processes. A number of abiotic and biotic related processes appeared to control accumulation of different soil P species and gave considerable variability in forms and concentrations within land use groups. The implications are that to increase agricultural P efficiencies mechanisms to utilise both soil Pi and Po are needed and that specific management strategies may be required for site-specific circumstances of soil C and reactive properties such as Fe and Al complexes.

AB - Data on the distribution of phosphorus (P) species in soils with differing land uses and properties are essential to understanding environmental P availability and how fertiliser inputs, cropping and grazing affect accumulation of soil inorganic P (Pi) and organic P (Po) forms. We examined thirty-two temperate soils (with soil organic C concentrations 12-449gCkg-1 and total P 295-3435mgPkg-1) for biogeochemical properties of soil C, reactive surfaces and P by common indices and 31P-NMR spectroscopy on NaOH-EDTA extracts for P species. Arable soil P was dominated by inorganic orthophosphate (276-2520mgPkg-1), >monoester P (105-446mgPkg-1). The limited diesters, polyphosphates and microbial P in arable soils suggest that cropping and fertiliser inputs limit ecosystem microbial functions and P diversity. Intensive grassland had inorganic orthophosphate concentrations (233-842mgPkg-1) similar to monoesters (200-658mgPkg-1)>diesters (0-50mgPkg-1) and polyphosphates (1-78mgPkg-1). As grazing became more extensive P in semi-natural systems was dominated by organic P, including monoesters (37-621mgPkg-1) and other diverse forms; principally diester (0-102mgPkg-1) and polyphosphates (0-108mgPkg-1). These were related to SOC, water extractable organic carbon (WEOC) and microbial P, suggesting strong microbially-mediated processes. A number of abiotic and biotic related processes appeared to control accumulation of different soil P species and gave considerable variability in forms and concentrations within land use groups. The implications are that to increase agricultural P efficiencies mechanisms to utilise both soil Pi and Po are needed and that specific management strategies may be required for site-specific circumstances of soil C and reactive properties such as Fe and Al complexes.

KW - Carbon

KW - Land use

KW - Oxalate extractable Fe, Al

KW - Phosphorus species

KW - Soils

UR - https://www.scopus.com/pages/publications/84937574363

U2 - 10.1016/j.geoderma.2015.03.020

DO - 10.1016/j.geoderma.2015.03.020

M3 - Article

AN - SCOPUS:84937574363

SN - 0016-7061

VL - 257-258

SP - 29

EP - 39

JO - Geoderma

JF - Geoderma

ER -