Does soil erosion rejuvenate the soil phosphorus inventory?

Andre Eger, Kyungsoo Yoo, Peter C. Almond, Gustavo Boitt, Isaac J. Larsen, Leo M. Condron, Xiang Wang, Simon M. Mudd

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)45-59
Number of pages15
JournalGeoderma
Volume332
DOIs
StatePublished - Dec 15 2018

Fingerprint

soil erosion
phosphorus
soil
hillslope
parent material
chronosequences
chronosequence
apatite
residence time
soil separates
saprolite
soil parent materials
landforms
weathering
dust
erosion rate

Keywords

  • Hillslopes
  • Phosphorus fractionation
  • Soil age
  • Soil chronosequences
  • Soil erosion
  • Soil parent material
  • Soil phosphorus
  • Soil residence time

Cite this

Eger, A., Yoo, K., Almond, P. C., Boitt, G., Larsen, I. J., Condron, L. M., ... Mudd, S. M. (2018). Does soil erosion rejuvenate the soil phosphorus inventory? Geoderma, 332, 45-59. https://doi.org/10.1016/j.geoderma.2018.06.021

Does soil erosion rejuvenate the soil phosphorus inventory? / Eger, Andre; Yoo, Kyungsoo; Almond, Peter C.; Boitt, Gustavo; Larsen, Isaac J.; Condron, Leo M.; Wang, Xiang; Mudd, Simon M.

In: Geoderma, Vol. 332, 15.12.2018, p. 45-59.

Research output: Contribution to journalArticle

Eger, A, Yoo, K, Almond, PC, Boitt, G, Larsen, IJ, Condron, LM, Wang, X & Mudd, SM 2018, 'Does soil erosion rejuvenate the soil phosphorus inventory?' Geoderma, vol. 332, pp. 45-59. https://doi.org/10.1016/j.geoderma.2018.06.021
Eger A, Yoo K, Almond PC, Boitt G, Larsen IJ, Condron LM et al. Does soil erosion rejuvenate the soil phosphorus inventory? Geoderma. 2018 Dec 15;332:45-59. https://doi.org/10.1016/j.geoderma.2018.06.021
Eger, Andre ; Yoo, Kyungsoo ; Almond, Peter C. ; Boitt, Gustavo ; Larsen, Isaac J. ; Condron, Leo M. ; Wang, Xiang ; Mudd, Simon M. / Does soil erosion rejuvenate the soil phosphorus inventory?. In: Geoderma. 2018 ; Vol. 332. pp. 45-59.
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