Does soil erosion rejuvenate the soil phosphorus inventory?

dc.contributor.authorEger, Andre
dc.contributor.authorYoo, K
dc.contributor.authorAlmond, Peter
dc.contributor.authorBoitt, G
dc.contributor.authorLarsen, IJ
dc.contributor.authorCondron, LM
dc.contributor.authorWang, Xiang
dc.contributor.authorMudd, SM
dc.date.accessioned2019-09-17T03:59:38Z
dc.date.available2018-07-09
dc.date.issued2018-12-15
dc.date.submitted2018-06-25
dc.description.abstractPhosphorus (P) is an essential nutrient for life. Deficits in soil P reduce primary production and alter biodiversity. A soil P paradigm based on studies of soils that form on flat topography, where erosion rates are minimal, indicates P is supplied to soil mainly as apatite from the underlying parent material and over time is lost via weathering or transformed into labile and less-bioavailable secondary forms. However, little is systematically known about P transformation and bioavailability on eroding hillslopes, which make up the majority of Earth's surface. By linking soil residence time to P fractions in soils and parent material, we show that the traditional concept of P transformation as a function of time has limited applicability to hillslope soils of the western Southern Alps (New Zealand) and Northern Sierra Nevada (USA). Instead, the P inventory of eroding soils at these sites is dominated by secondary P forms across a range of soil residence times, an observation consistent with previously published soil P data. The findings for hillslope soils contrast with those from minimally eroding soils used in chronosequence studies, where the soil P paradigm originated, because chronosequences are often located on landforms where parent materials are less chemically altered and therefore richer in apatite P compared to soils on hillslopes, which are generally underlain by pre-weathered parent material (e.g., saprolite). The geomorphic history of the soil parent material is the likely cause of soil P inventory differences for eroding hillslope soils versus geomorphically stable chronosequence soils. Additionally, plants and dust seem to play an important role in vertically redistributing P in hillslope soils. Given the dominance of secondary soil P in hillslope soils, limits to ecosystem development caused by an undersupply of bio-available P may be more relevant to hillslopes than previously thought.
dc.format.extentpp.45-59
dc.identifier.doi10.1016/j.geoderma.2018.06.021
dc.identifier.issn0016-7061
dc.identifier.urihttps://hdl.handle.net/10182/10959
dc.languageen
dc.language.isoen
dc.publisherElsevier
dc.relationThe original publication is available from Elsevier - https://doi.org/10.1016/j.geoderma.2018.06.021 - http://dx.doi.org/10.1016/j.geoderma.2018.06.021
dc.relation.isPartOfGeoderma
dc.relation.urihttps://doi.org/10.1016/j.geoderma.2018.06.021
dc.rights© 2018 Elsevier B.V. All rights reserved.
dc.subjectsoil phosphorus
dc.subjectphosphorus fractionation
dc.subjectsoil residence time
dc.subjectsoil age
dc.subjectsoil erosion
dc.subjecthillslopes
dc.subjectsoil chronosequences
dc.subjectsoil parent material
dc.titleDoes soil erosion rejuvenate the soil phosphorus inventory?
dc.typeJournal Article
lu.contributor.unitLincoln University
lu.contributor.unitFaculty of Agriculture and Life Sciences
lu.contributor.unitDepartment of Soil and Physical Sciences
lu.identifier.orcid0000-0003-4203-1529
pubs.publication-statusPublished
pubs.publisher-urlhttp://dx.doi.org/10.1016/j.geoderma.2018.06.021
pubs.volume332
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