Does soil erosion rejuvenate the soil phosphorus inventory?
dc.contributor.author | Eger, Andre | |
dc.contributor.author | Yoo, K | |
dc.contributor.author | Almond, Peter | |
dc.contributor.author | Boitt, G | |
dc.contributor.author | Larsen, IJ | |
dc.contributor.author | Condron, LM | |
dc.contributor.author | Wang, Xiang | |
dc.contributor.author | Mudd, SM | |
dc.date.accessioned | 2019-09-17T03:59:38Z | |
dc.date.available | 2018-07-09 | |
dc.date.issued | 2018-12-15 | |
dc.date.submitted | 2018-06-25 | |
dc.description.abstract | Phosphorus (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.extent | pp.45-59 | |
dc.identifier.doi | 10.1016/j.geoderma.2018.06.021 | |
dc.identifier.issn | 0016-7061 | |
dc.identifier.uri | https://hdl.handle.net/10182/10959 | |
dc.language | en | |
dc.language.iso | en | |
dc.publisher | Elsevier | |
dc.relation | The 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.isPartOf | Geoderma | |
dc.relation.uri | https://doi.org/10.1016/j.geoderma.2018.06.021 | |
dc.rights | © 2018 Elsevier B.V. All rights reserved. | |
dc.subject | soil phosphorus | |
dc.subject | phosphorus fractionation | |
dc.subject | soil residence time | |
dc.subject | soil age | |
dc.subject | soil erosion | |
dc.subject | hillslopes | |
dc.subject | soil chronosequences | |
dc.subject | soil parent material | |
dc.title | Does soil erosion rejuvenate the soil phosphorus inventory? | |
dc.type | Journal Article | |
lu.contributor.unit | Lincoln University | |
lu.contributor.unit | Faculty of Agriculture and Life Sciences | |
lu.contributor.unit | Department of Soil and Physical Sciences | |
lu.identifier.orcid | 0000-0003-4203-1529 | |
pubs.publication-status | Published | |
pubs.publisher-url | http://dx.doi.org/10.1016/j.geoderma.2018.06.021 | |
pubs.volume | 332 |