A leaky model of long‐term soil phosphorus dynamics

Boyle, John; Chiverrell, Richard; Norton, Stephen A.; Plater, Andy

doi:10.1002/gbc.20054

Cited by 23 publications

(41 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, at Lilla Öresjön the situation is very different. The uncorrected and regression-corrected data both fail to show the trends of variation through the late glacial, and both fail to detect the enrichment in Fe, Cu, Zn, P and Y during the earliest Holocene, and thus fail to show a signal of substantial environmental significance (Boyle et al 2013). Thus the successful dry mass correction obtained using the X-ray back-scatter water content estimate profoundly improves the geochemical interpretation.…”

Section: (142)mentioning

confidence: 87%

Approaches to Water Content Correction and Calibration for µXRF Core Scanning: Comparing X-ray Scattering with Simple Regression of Elemental Concentrations

Boyle

Chiverrell

Schillereff

2015

Micro-XRF Studies of Sediment Cores

Self Cite

View full text Add to dashboard Cite

Geochemical evaluation of sediment records traditionally exploits dry mass concentration data; the new generation of scanning XRF devices, however, are generally presented with wet sediment cores. Therefore, conversion of wet core measured XRF data to dry mass concentrations will aid the palaeoenvironmental interpretation, provided the method used is reliable and avoids loss of data quality. Here, using data from a GEOTEK/Olympus DELTA scanning µXRF device (approximately 5 mm resolution), we compare two methods: (1) correction by simple regression, calibrated using dry sediment elemental concentration data measured for a 'training set' of subsamples, and (2) a novel technique that corrects for water content estimated using X-ray scattering data obtained during scanning. We show that where sediment water contents are highly variable the regression method fails while water content correction methods can be highly effective. Where water sediment water contents are relatively constant, the elemental regression is as effective and introduces less noise.

show abstract

Section: (142)mentioning

confidence: 87%

Approaches to Water Content Correction and Calibration for µXRF Core Scanning: Comparing X-ray Scattering with Simple Regression of Elemental Concentrations

Boyle

Chiverrell

Schillereff

2015

Micro-XRF Studies of Sediment Cores

Self Cite

View full text Add to dashboard Cite

show abstract

“…Since phosphorus (P) is a rock-derived nutrient, its availability to an ecosystem is usually controlled by the concentration and reactivity of the phosphorus-containing mineral apatite in the rock (Boyle et al, 2013). Furthermore, the amount of mobile and readily available P in soil is usually low because P is easily taken up by organisms or sorbed onto mineral surfaces.…”

Section: Hypothesismentioning

confidence: 99%

Reviews and syntheses: on the roles trees play in building and plumbing the critical zone

et al. 2017

View full text Add to dashboard Cite

Abstract. Trees, the most successful biological power plants on earth, build and plumb the critical zone (CZ) in ways that we do not yet understand. To encourage exploration of the character and implications of interactions between trees and soil in the CZ, we propose nine hypotheses that can be tested at diverse settings. The hypotheses are roughly divided into those about the architecture (building) and those about the water (plumbing) in the CZ, but the two functions are intertwined. Depending upon one's disciplinary background, many of the nine hypotheses listed below may appear obviously true or obviously false. (1) Tree roots can only physically penetrate and biogeochemically comminute the immobile substrate underlying mobile soil where that underlying substrate is fractured or pre-weathered. (2) In settings where the thickness of weathered material, H , is large, trees primarily shape the CZ through biogeochemical reactions within the rooting zone. (3) In forested uplands, the thickness of mobile soil, h, can evolve toward a steady state because of feedbacks related to root disruption and tree throw. (4) In settings where h H and the rates of uplift and erosion are low, the uptake of phosphorus into trees is buffered by the fine-grained fraction of the soil, and the ultimate source of this phosphorus is dust. (5) In settings of limited water availability, trees maintain the highest length density of functional roots at depths where water can be extracted over most of the growing season with the least amount of energy expenditure. (6) Trees grow the majority of their roots in the zone where the most growth-limiting resource is abundant, but they also grow roots at other depths to forage for other resources and to hydraulically redistribute those resources to depths where they can be taken up more efficiently. (7) Trees rely on matrix water in the unsaturated zone that at times may have anPublished by Copernicus Publications on behalf of the European Geosciences Union. 5116 S. L. Brantley et al.: Reviews and syntheses: on the roles trees play in building and plumbing the critical zone isotopic composition distinct from the gravity-drained water that transits from the hillslope to groundwater and streamflow. (8) Mycorrhizal fungi can use matrix water directly, but trees can only use this water by accessing it indirectly through the fungi. (9) Even trees growing well above the valley floor of a catchment can directly affect stream chemistry where changes in permeability near the rooting zone promote intermittent zones of water saturation and downslope flow of water to the stream. By testing these nine hypotheses, we will generate important new cross-disciplinary insights that advance CZ science.

show abstract

“…The landscape P export model of Boyle et al (2013; Figure 1) is based around two soil P pools: primary (apatite) and secondary (a lumped pool of organic, non-apatite inorganic and adsorbed P). The primary P pool receives an initial dose on soil formation and is then supplemented by long transported atmospheric dust (much higher local dust fluxes are assumed at larger spatial scales to be balance by local export Tipping et al, 2014) and downward migration of the soil base into underlying parent material in response to erosive unloading.…”

Section: An Anthropogenic Component To the P Export Modelmentioning

confidence: 99%

An approach to modelling the impact of prehistoric farming on Holocene landscape phosphorus dynamics

et al. 2014

View full text Add to dashboard Cite

The lake sediment phosphorus (P) record at Hatch Mere (Cheshire, UK) is investigated to assess the role of human activity in modifying Holocene landscape P export dynamics, and to develop an approach to incorporating this effect into a pre-existing long-term, large-scale landscape model of natural P export. Analysis of the lake sediment record shows that the catchment P yield is low and constant prior to ca. 6000 BP, but then increases up to the present day. This increase occurs in steps that coincide with the Neolithic, Bronze Age and Medieval periods, and the first half of the 20th century, consistent with an anthropogenic cause. Such an interpretation is supported by close correlation of the P export flux with the estimated regional population density. We demonstrate that the effect of human activity on landscape P dynamics can be incorporated into the existing P export model by scaling the soil secondary P leakage rate coefficient to population density. The findings of this study suggest that lake sediment P accumulation rate data may provide a novel method for estimating prehistoric local population density. Additionally, we show that the pre-Neolithic landscape P export was low, and we reject the widely held view that Hatch Mere is naturally eutrophic.

show abstract

A leaky model of long‐term soil phosphorus dynamics

Cited by 23 publications

References 37 publications

Approaches to Water Content Correction and Calibration for µXRF Core Scanning: Comparing X-ray Scattering with Simple Regression of Elemental Concentrations

Approaches to Water Content Correction and Calibration for µXRF Core Scanning: Comparing X-ray Scattering with Simple Regression of Elemental Concentrations

Reviews and syntheses: on the roles trees play in building and plumbing the critical zone

An approach to modelling the impact of prehistoric farming on Holocene landscape phosphorus dynamics

Contact Info

Product

Resources

About