Modeling phosphorus transport in agricultural watersheds

Processes and possibilities

Andrew N. Sharpley, Peter J A Kleinman, Richard W. McDowell, Margaret Gitau, Ray B. Bryant

Research output: Contribution to journalArticle

168 Citations (Scopus)

Abstract

Modeling phosphorus (P) loss from agricultural watersheds is key to quantifying the long term water quality benefits of alternative best management practices. Scientists engaged in this endeavor struggle to represent processes controlling P transport at scales and time frames that are meaningful to farmers, resource managers, and policy makers. To help overcome these challenges, we reviewed salient issues facing scientists that model P transport, providing a conceptual framework from which process-based P transport models might be evaluated. Recent advances in quantifying the release of soil P to overland and subsurface flow show that extraction coefficients relating soil and flow P are variable but can be represented as a function of land cover or erosion. Existing information on best management effects on P export should be linked to watershed models to better represent changes in P transport. The main needs of P transport models are inclusion of flexible coefficients relating soil and overland flow P, fertilizer and manure management and P loss, stream channel effects on edge-of-field P losses prior to water body input, and linkage of watershed and water-body response models. However, it is essential that the most appropriate model be carefully selected, according to a user's needs in terms of available input data, level of predictive accuracy, and scale of simulation being considered.

Original languageEnglish (US)
Pages (from-to)425-439
Number of pages15
JournalJournal of Soil and Water Conservation
Volume57
Issue number6
StatePublished - Nov 1 2002

Fingerprint

agricultural watersheds
watershed
phosphorus
modeling
overland flow
body water
soil
animal manure management
subsurface flow
best management practices
stream channel
best management practice
stream channels
hydrologic models
edge effects
conceptual framework
land cover
manure
managers
water quality

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Water Science and Technology
  • Soil Science
  • Nature and Landscape Conservation

Cite this

Sharpley, A. N., Kleinman, P. J. A., McDowell, R. W., Gitau, M., & Bryant, R. B. (2002). Modeling phosphorus transport in agricultural watersheds: Processes and possibilities. Journal of Soil and Water Conservation, 57(6), 425-439.
Sharpley, Andrew N. ; Kleinman, Peter J A ; McDowell, Richard W. ; Gitau, Margaret ; Bryant, Ray B. / Modeling phosphorus transport in agricultural watersheds : Processes and possibilities. In: Journal of Soil and Water Conservation. 2002 ; Vol. 57, No. 6. pp. 425-439.
@article{ef382b2998584af390a7e979b36a11ed,
title = "Modeling phosphorus transport in agricultural watersheds: Processes and possibilities",
abstract = "Modeling phosphorus (P) loss from agricultural watersheds is key to quantifying the long term water quality benefits of alternative best management practices. Scientists engaged in this endeavor struggle to represent processes controlling P transport at scales and time frames that are meaningful to farmers, resource managers, and policy makers. To help overcome these challenges, we reviewed salient issues facing scientists that model P transport, providing a conceptual framework from which process-based P transport models might be evaluated. Recent advances in quantifying the release of soil P to overland and subsurface flow show that extraction coefficients relating soil and flow P are variable but can be represented as a function of land cover or erosion. Existing information on best management effects on P export should be linked to watershed models to better represent changes in P transport. The main needs of P transport models are inclusion of flexible coefficients relating soil and overland flow P, fertilizer and manure management and P loss, stream channel effects on edge-of-field P losses prior to water body input, and linkage of watershed and water-body response models. However, it is essential that the most appropriate model be carefully selected, according to a user's needs in terms of available input data, level of predictive accuracy, and scale of simulation being considered.",
author = "Sharpley, {Andrew N.} and Kleinman, {Peter J A} and McDowell, {Richard W.} and Margaret Gitau and Bryant, {Ray B.}",
year = "2002",
month = "11",
day = "1",
language = "English (US)",
volume = "57",
pages = "425--439",
journal = "Journal of Soils and Water Conservation",
issn = "0022-4561",
publisher = "Soil Conservation Society of America",
number = "6",

}

Sharpley, AN, Kleinman, PJA, McDowell, RW, Gitau, M & Bryant, RB 2002, 'Modeling phosphorus transport in agricultural watersheds: Processes and possibilities', Journal of Soil and Water Conservation, vol. 57, no. 6, pp. 425-439.

Modeling phosphorus transport in agricultural watersheds : Processes and possibilities. / Sharpley, Andrew N.; Kleinman, Peter J A; McDowell, Richard W.; Gitau, Margaret; Bryant, Ray B.

In: Journal of Soil and Water Conservation, Vol. 57, No. 6, 01.11.2002, p. 425-439.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Modeling phosphorus transport in agricultural watersheds

T2 - Processes and possibilities

AU - Sharpley, Andrew N.

AU - Kleinman, Peter J A

AU - McDowell, Richard W.

AU - Gitau, Margaret

AU - Bryant, Ray B.

PY - 2002/11/1

Y1 - 2002/11/1

N2 - Modeling phosphorus (P) loss from agricultural watersheds is key to quantifying the long term water quality benefits of alternative best management practices. Scientists engaged in this endeavor struggle to represent processes controlling P transport at scales and time frames that are meaningful to farmers, resource managers, and policy makers. To help overcome these challenges, we reviewed salient issues facing scientists that model P transport, providing a conceptual framework from which process-based P transport models might be evaluated. Recent advances in quantifying the release of soil P to overland and subsurface flow show that extraction coefficients relating soil and flow P are variable but can be represented as a function of land cover or erosion. Existing information on best management effects on P export should be linked to watershed models to better represent changes in P transport. The main needs of P transport models are inclusion of flexible coefficients relating soil and overland flow P, fertilizer and manure management and P loss, stream channel effects on edge-of-field P losses prior to water body input, and linkage of watershed and water-body response models. However, it is essential that the most appropriate model be carefully selected, according to a user's needs in terms of available input data, level of predictive accuracy, and scale of simulation being considered.

AB - Modeling phosphorus (P) loss from agricultural watersheds is key to quantifying the long term water quality benefits of alternative best management practices. Scientists engaged in this endeavor struggle to represent processes controlling P transport at scales and time frames that are meaningful to farmers, resource managers, and policy makers. To help overcome these challenges, we reviewed salient issues facing scientists that model P transport, providing a conceptual framework from which process-based P transport models might be evaluated. Recent advances in quantifying the release of soil P to overland and subsurface flow show that extraction coefficients relating soil and flow P are variable but can be represented as a function of land cover or erosion. Existing information on best management effects on P export should be linked to watershed models to better represent changes in P transport. The main needs of P transport models are inclusion of flexible coefficients relating soil and overland flow P, fertilizer and manure management and P loss, stream channel effects on edge-of-field P losses prior to water body input, and linkage of watershed and water-body response models. However, it is essential that the most appropriate model be carefully selected, according to a user's needs in terms of available input data, level of predictive accuracy, and scale of simulation being considered.

UR - http://www.scopus.com/inward/record.url?scp=0036872591&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036872591&partnerID=8YFLogxK

M3 - Article

VL - 57

SP - 425

EP - 439

JO - Journal of Soils and Water Conservation

JF - Journal of Soils and Water Conservation

SN - 0022-4561

IS - 6

ER -

Sharpley AN, Kleinman PJA, McDowell RW, Gitau M, Bryant RB. Modeling phosphorus transport in agricultural watersheds: Processes and possibilities. Journal of Soil and Water Conservation. 2002 Nov 1;57(6):425-439.