Using soil phosphorus behavior to identify environmental thresholds

Peter J.A. Kleinman, Ray B. Bryant, W. Shaw Reid, Andrew N. Sharpley, David Pimentel

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

Concern over the transport of phosphorus from agricultural soils to surface waters has focused attention on the role of soil phosphorus in environmental risk assessment. This study explores the existence of natural soil phosphorus thresholds as expressed by Quantity/Intensity relationships. Fifty-nine samples, collected from agricultural soils in New York's Delaware River Watershed, were analyzed for Morgan, Meblich III, and 0.01 M CaCl2extractable P. Soil P sorption saturation was calculated as a function of oxalate extractable P, Fe, and Al. In addition, P sorption isotherms were determined for all soils. Thresholds in the relationships between CaCl2P and Morgan P, Mehlich III P, and P sorption saturation were identified by segmented linear regression (change point analysis). Thresholds in the relationship between CaCl2P and Morgan P, Mehlich III P, and P sorption saturation occurred at CaCl2P concentrations of 0.9 mg kg-1, suggesting a threshold for soil P that may have use in environmental risk assessment. A P sorption threshold was also identified by segmented, quadratic-linear regression of the sorption isotherms. Results described a fundamental property of soils: A nonlinear sorption of P in soils that exhibits a threshold, above which the potential for P release from soil to water increases. This threshold describes a critical point in the release of P and, therefore, may be of environmental importance in estimating the potential for soluble P loss from soil by runoff and leaching. (Soil Science 2000;165:943-950).

Original languageEnglish (US)
Pages (from-to)943-950
Number of pages8
JournalSoil Science
Volume165
Issue number12
DOIs
StatePublished - Jan 1 2000

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phosphorus
sorption
soil
sorption isotherms
environmental assessment
agricultural soils
saturation
quantity-intensity relationships
agricultural soil
Delaware River
isotherm
losses from soil
soil science
oxalates
soil properties
leaching
surface water
runoff
oxalate
watershed

All Science Journal Classification (ASJC) codes

  • Soil Science

Cite this

Kleinman, P. J. A., Bryant, R. B., Reid, W. S., Sharpley, A. N., & Pimentel, D. (2000). Using soil phosphorus behavior to identify environmental thresholds. Soil Science, 165(12), 943-950. https://doi.org/10.1097/00010694-200012000-00004
Kleinman, Peter J.A. ; Bryant, Ray B. ; Reid, W. Shaw ; Sharpley, Andrew N. ; Pimentel, David. / Using soil phosphorus behavior to identify environmental thresholds. In: Soil Science. 2000 ; Vol. 165, No. 12. pp. 943-950.
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Kleinman, PJA, Bryant, RB, Reid, WS, Sharpley, AN & Pimentel, D 2000, 'Using soil phosphorus behavior to identify environmental thresholds', Soil Science, vol. 165, no. 12, pp. 943-950. https://doi.org/10.1097/00010694-200012000-00004

Using soil phosphorus behavior to identify environmental thresholds. / Kleinman, Peter J.A.; Bryant, Ray B.; Reid, W. Shaw; Sharpley, Andrew N.; Pimentel, David.

In: Soil Science, Vol. 165, No. 12, 01.01.2000, p. 943-950.

Research output: Contribution to journalArticle

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N2 - Concern over the transport of phosphorus from agricultural soils to surface waters has focused attention on the role of soil phosphorus in environmental risk assessment. This study explores the existence of natural soil phosphorus thresholds as expressed by Quantity/Intensity relationships. Fifty-nine samples, collected from agricultural soils in New York's Delaware River Watershed, were analyzed for Morgan, Meblich III, and 0.01 M CaCl2extractable P. Soil P sorption saturation was calculated as a function of oxalate extractable P, Fe, and Al. In addition, P sorption isotherms were determined for all soils. Thresholds in the relationships between CaCl2P and Morgan P, Mehlich III P, and P sorption saturation were identified by segmented linear regression (change point analysis). Thresholds in the relationship between CaCl2P and Morgan P, Mehlich III P, and P sorption saturation occurred at CaCl2P concentrations of 0.9 mg kg-1, suggesting a threshold for soil P that may have use in environmental risk assessment. A P sorption threshold was also identified by segmented, quadratic-linear regression of the sorption isotherms. Results described a fundamental property of soils: A nonlinear sorption of P in soils that exhibits a threshold, above which the potential for P release from soil to water increases. This threshold describes a critical point in the release of P and, therefore, may be of environmental importance in estimating the potential for soluble P loss from soil by runoff and leaching. (Soil Science 2000;165:943-950).

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Kleinman PJA, Bryant RB, Reid WS, Sharpley AN, Pimentel D. Using soil phosphorus behavior to identify environmental thresholds. Soil Science. 2000 Jan 1;165(12):943-950. https://doi.org/10.1097/00010694-200012000-00004