P index is a management tool commonly used to identify critical source areas (CSAs) in agro-catchments. We tested the applicability of several P-index models adjusted to Eastern Mediterranean conditions. On the basis of model structure and data requirements, we selected the Arkansas model and two models with the RUSLE equation and runoff curve number (RCN). Concurrently, we developed a GIS-based Hermon-P model which was designed to simulate rainfall–runoff events representing the major nutrient-transport mechanism in Eastern Mediterranean. The P index values computed by the Arkansas and RUSLE models exhibited low correlation (r 2 < 0.32) with the measured soluble reactive (SRP) and total P (TP), while the RCN model result correlations were somewhat higher (r 2 = 0.53 for SRP and 0.45 for TP). High correlations between the calculated and measured P during rainfall–runoff events were only achieved with the Hermon model (r 2 = 0.77 to 0.9). These high coefficients resulted from avoiding subjective categorization of the continuous variables and using the measured site-specific erosional predictors instead. On one occasion, during the first significant runoff event of the year, the Hermon model failed to predict total P in the stream water (r 2 = 0.14) because of considerable resuspension of stream sediments. Most of the P-index models are based on the perceptual transfer-continuum framework that was developed for temperate agro-catchments; this framework does not consider P resuspension along streams during rainfall–runoff events. Hence, a new set of equations should be added to the P index to account for potential resuspension in Eastern Mediterranean streams at the beginning of the hydrological year.
References
[1]
Abell, J.M.; ？zkundakci, D.; Hamilton, D.P.; Miller, S.D. Relationships between land use and nitrogen and phosphorus in New Zealand lakes. Mar. Freshw. Res. 2011, 62, 162–175.
[2]
Smith, V.H. Eutrophication of freshwater and coastal marine ecosystems: A global problem. Environ. Sci. Pollut. Res. Int. 2003, 10, 126–139, doi:10.1065/espr2002.12.142.
[3]
Paerl, H. Nutrient and other environmental controls of harmful cyanobacterial blooms along the freshwater-marine continuum. In Cyanobacterial Harmful Algal Blooms: State of the Science and Research Needs; Hudnell, K.H., Ed.; Springer: New York, NY, USA, 2008; Volume 619, pp. 217–237.
[4]
Paerl, H.W.; Huisman, J. Blooms like it hot. Science 2008, 320, 57–58.
[5]
Elser, J.J.; Bracken, M.E.S.; Cleland, E.E.; Gruner, D.S.; Harpole, W.S.; Hillebrand, H.; Ngai, J.T.; Seabloom, E.W.; Shurin, J.B.; Smith, J.E. Global analysis of nitrogen and phosphorus limitation of primary producers in freshwater, marine and terrestrial ecosystems. Ecol. Lett. 2007, 10, 1135–1142, doi:10.1111/j.1461-0248.2007.01113.x.
[6]
McDowell, R.W.; Larned, S.T.; Houlbrooke, D.J. Nitrogen and phosphorus in New Zealand streams and rivers: Control and impact of eutrophication and the influence of land management. N. Z. J. Mar. Freshw. Res. 2009, 43, 985–995, doi:10.1080/00288330909510055.
[7]
Sharpley, A.N.; Rekolainen, S. Phosphorus in agriculture and its environmental implications. In Phosphorus Loss from Soil to Water; Tunney, H., Carton, O.T., Brookes, P.C., Johnston, A.E., Eds.; CAB International Press: Cambridge, UK, 1997; pp. 1–54.
[8]
Howarth, R.; Anderson, D.; Cloern, J.; Elfring, C.; Hopkinson, C.; Lapointe, B.; Malone, T.; Marcus, N.; McGlathery, K.; Sharpley, A.; et al. Nutrient pollution of coastal rivers, bays, and seas. Issues Ecol. 2000, 7, 1–15.
[9]
Gburek, W.J.; Sharpley, A.N. Hydrologic controls on phosphorus loss from upland agricultural watersheds. J. Environ. Qual. 1998, 27, 267–277, doi:10.2134/jeq1998.00472425002700020005x.
[10]
Gburek, W.J.; Sharpley, A.N.; Heathwaite, L.; Folmar, G.J. Phosphorus management at the watershed scale: A modification of the phosphorus index. J. Environ. Qual. 2000, 29, 130–144.
[11]
McDowell, R.W. Phosphorus and sediment loss in a catchment with winter forage grazing of cropland by dairy cattle. J. Environ. Qual. 2006, 35, 575–583, doi:10.2134/jeq2005.0364.
[12]
James, E.; Kleinman, P.; Veith, T.; Stedman, R.; Sharpley, A. Phosphorus contributions from pastured dairy cattle to streams of the Cannonsville watershed, New York. J. Soil Water Conserv. 2007, 62, 40–47.
[13]
Johnes, P.J.; Heathwaite, A.L. Modelling the impact of land use change on water quality in agricultural catchments. Hydrol. Proc. 1997, 11, 269–286, doi:10.1002/(SICI)1099-1085(19970315)11:3<269::AID-HYP442>3.0.CO;2-K.
[14]
Udawatta, R.P.; Motavalli, P.P.; Garrett, H.E. Phosphorus loss and runoff characteristics in three adjacent agricultural watersheds with claypan soils. J. Environ. Qual. 2004, 33, 1709–1719, doi:10.2134/jeq2004.1709.
[15]
Heathwaite, A.L.; Fraser, A.I.; Johnes, P.J.; Hutchins, M.; Lord, E.; Butterfield, D. The phosphorus indicators tool: A simple model of diffuse P loss from agricultural land to water. Soil Use Manag. 2003, 19, 1–11.
[16]
McDowell, R.W.; Drewry, J.J.; Muirhead, R.W.; Paton, R.J. Cattle treading and phosphorus and sediment loss in overland flow from grazed cropland. Aust. J. Soil Res. 2003, 41, 1521–1532, doi:10.1071/SR03042.
[17]
Buczko, U.; Kuchenbuch, R.O. Phosphorus indices as risk-assessment tools in the USA and Europe—A review. J. Plant Nutr. Soil Sci. 2007, 170, 445–460, doi:10.1002/jpln.200725134.
[18]
Good, L.W.; Panuska, J.C.; Vadas, P. Current calculations in the Wisconsin P Index. Available online: http://wpindex.soils.wisc.edu (accessed on 12 December 2012).
[19]
Bechmann, M.; Krogstad, T.; Sharpley, A. A phosphorus index for norway. Acta Agric. Scand. Sect. B Soil Plant Sci. 2005, 55, 205–213.
[20]
Lemunyon, J.L.; Gilbert, R.G. The concept and need for a phosphorus assessment-tool. J. Prod. Agric. 1993, 6, 483–486.
[21]
McDowell, R.W.; Srinivasan, M.S. Identifying critical source areas for water quality: 2. Validating the approach for phosphorus and sediment losses in grazed headwater catchments. J. Hydrol. 2009, 379, 68–80, doi:10.1016/j.jhydrol.2009.09.045.
[22]
DeLaune, P.B.; Moore, P.A.; Carman, D.K.; Sharpley, A.N.; Haggard, B.E.; Daniel, T.C. Evaluation of the phosphorus source component in the phosphorus index for pastures. J. Environ. Qual. 2004, 33, 2192–2200, doi:10.2134/jeq2004.2192.
[23]
Natural Resources Conservation Service. The Phosphorus Index: A Phosphorus Assessment Tool; Technical Note, Series No 1901. USDA Natural Resources Conservation Service: Washington, DC, USA, 1994.
[24]
Yosef, Y.; Saaroni, Y.; Alpert, P. Trends in daily rainfall intensity over Israel 1950/1-2003/4. Open Atmos. Sci. J. 2009, 3, 196–203, doi:10.2174/1874282300903010196.
[25]
Berman, T.; Pollingher, U.; Zohary, T. A short history of stability and change in phytoplankton populations in Lake Kinneret. Isr. J. Plant Sci. 1998, 46, 73–80.
[26]
Hadas, O.; Pinkas, R.; Malinsky-Rushansky, N.; Shalev-Alon, G.; Delphine, E.; Berner, T.; Sukenik, A.; Kaplan, A. Physiological variables determined under laboratory conditions may explain the bloom of Aphanizomenon ovalisporum in Lake Kinneret. Eur. J. Phycol. 2002, 37, 259–267, doi:10.1017/S0967026202003645.
[27]
Dan, J.; Singer, A. Soil evolution on basalt and basic pyroclastic materials in Golan Heights. Geoderma 1973, 9, 165–192, doi:10.1016/0016-7061(73)90057-8.
[28]
Carter, M.R. Soil Sampling and Methods of Analysis. Canadian Society of Soil Science; Lewis Publishers: Boca Raton, FL, USA, 1993; p. 823.
[29]
Zhang, R.D. Determination of soil sorptivity and hydraulic conductivity from the disk infiltrometer. Soil Sci. Soc. Am. J. 1997, 61, 1024–1030, doi:10.2136/sssaj1997.03615995006100040005x.
[30]
Tiessen, H.; Moir, J.O. Charactrization of available P by sequential extraction. In Soil Sampling and Methods of Analysis, Canadian Society of Soil Science; Carter, M.R., Ed.; Lewis Publishers: Boca Raton, FL, USA, 1993; pp. 75–84.
[31]
Wood, D.H. Estimating rabbit density by counting dung pellets. Wildlife Res. 1988, 15, 665–671, doi:10.1071/WR9880665.
[32]
Madhusudan, M.D. Recovery of wild large herbivores following livestock decline in a tropical Indian wildlife reserve. J. Appl. Ecol. 2004, 41, 858–869, doi:10.1111/j.0021-8901.2004.00950.x.
[33]
Clesceri, L.S. Standard Methods for the Examination of Water and Wastewater, 20th ed.; American Public Health Association: Washington, DC, USA, 1998.
Renard, K.G.; Foster, G.R.; Weesies, G.A.; McCool, D.K.; Yoder, D.C. Predicting Soil Erosion by Water: A Guide to Conservation Planning with the Revised Universal Soil Loss Equation (RUSLE); USDA Agricultural Handbook; USDA: Washington, DC, USA, 1997; Volume 703, p. 404.
[36]
Mallarino, A.P.; Stewart, B.M.; Baker, J.L.; Downing, J.D.; Sawyer, J.E. Phosphorus indexing for cropland: Overview and basic concepts of the Iowa phosphorus index. J. Soil Water Conserv. 2002, 57, 440–447.
[37]
Weld, J.; Beegle, D.B.; Bryant, R.; Gburek, W.J.; Kleinman, P.; Sharpley, A.N. The Pennsylvania Phosphorus Index; Version 2, UC180; The College of Agricultural Sciences, Pennsylvania State University: University Park, PA, USA, 2007.
[38]
Morin, J.; Michaeli, A.; Agassi, M.; Atzmon, B.; Rozentzveig, D. Rainfall–Runoff–Erosion Relations in the Lake Kinneret Watershed (in Hebrew); Soil Erosion Research Station, Agricultural Research Organization, The Ministry of Agricultural and Rural Development: Bet-Dagan, Israel, 1979.
[39]
Simms, A.D.; Woodroffe, C.D.; Jones, B.G. Application of RUSLE for erosion management in a coastal catchment, southern NSW. In Proceedings of the MODSIM 2003: International Congress Modelling and SimulationIntegrative Modelling of BiophysicalSocial and Economic Systems for Resource Managment Solutions, Townsville, Australia, 14–17 July 2003; Volume 2, pp. 678–683.
[40]
Mitasova, H.; Mitas, L. Modeling Soil Detachment with RUSLE 3D Using GIS; Geographic Modeling Systems Lab, University of Illinois at Urbana-Champaign, 1999. Available online: http://skagit.meas.ncsu.edu/~helena/gmslab/erosion/usle.html (accessed on 12 December 2012).
[41]
Stone, R.P.; Hilborn, D. Factsheet, Universal Soil Loss Equation (USLE); Ministry of Agriculture, Food and Rural Affairs, Ontario, Canada, 2000. Available online: http://www.omafra.gov.on.ca/english/engineer/facts/00-001.pdf (accessed on 12 December 2012).
[42]
Trahan, N. Modeling Sediment and Contaminant Pathways to the Cedar River; ESRI User Conference, 2002. Available online: http://proceedings.esri.com/library/userconf/proc02/pap0785/p0785.htm (accessed on 12 December 2012).
[43]
Bakker, M.M.; Govers, G.; Doom, A.V.; Quetier, F.; Chouvardas, D.; Rounsevell, M. The response of soil erosion and sediment export to land-use change in four areas of Europe: The importance of landscape pattern. Geomorphology 2008, 98, 213–226, doi:10.1016/j.geomorph.2006.12.027.
[44]
Van Bochove, E.; Thériault, G.; Denault, J.T. Indicator of Risk of Water Contamination by Phosphorus (IROWC_P): A Handbook for Presenting the IROWC_P Algorithms; Contribution No. AAFC/AAC; Agriculture and Agri-Food Canada: Quebec, Canada, 2009.
[45]
Zhan, X.; Huang, M.-L. ARCCN-runoff: An ARCGIS tool for generating curve number and runoff maps. Environ. Model. Softw. 2004, 19, 875–879, doi:10.1016/j.envsoft.2004.03.001.
[46]
Kurz, I.; O’Reilly, C.D.; Tunney, H. Impact of cattle on soil physical properties and nutrient concentrations in overland flow from pasture in Ireland. Agric. Ecosyst. Environ. 2006, 113, 378–390, doi:10.1016/j.agee.2005.10.004.
[47]
Herbin, T.; Hennessy, D.; Richards, K.G.; Piwowarczyk, A.; Murphy, J.J.; Holden, N.M. The effects of dairy cow weight on selected soil physical properties indicative of compaction. Soil Use Manag. 2011, 27, 36–44, doi:10.1111/j.1475-2743.2010.00309.x.
[48]
US EPA (United States Environmental Protection Agency). Ecoregional Nutrient Criteria Documents: Rivers and Streams; U.S. Environmental Protection Agency: Washington, DC, USA, 2000. Available online: http://www.epa.gov/waterscience/criteria/nutrient/ecoregions/rivers/index.html (accessed on 12 December 2012).
[49]
Bundy, L.G.; Mallarino, A.P.; Good, L.W. Field-scale tools for reducing nutrient losses to water resources. In Final Report: Gulf Hypoxia and Local Water Quality Concerns Workshop, Ames, Iowa; American Society of Agricultural and Biological Engineers: St. Joseph, MI, USA, 2008; pp. 159–170.
[50]
Weld, J.; Beegle, D.B.; Bryant, R.; Gburek, W.J.; Kleinman, P.; Sharpley, A.N. The Pennsylvania Phosphorus Index, Version 1; Pub. Code: US 180 5M3/03PS4591; The College of Agricultural Sciences, Pennsylvania State University: University Park, PA, USA, 2003.
[51]
Harmel, R.D.; Torbert, H.A.; DeLaune, P.B.; Haggard, B.E.; Haney, R.L. Field evaluation of three phosphorus indices on new application sites in Texas. J. Soil Water Conserv. 2005, 60, 29–42.
[52]
Huisman, N.L.H.; Karthikeyan, K.G. Using radiometric tools to track sediment and phosphorus movement in an agricultural watershed. J. Hydrol. 2012, 450–451, 219–229, doi:10.1016/j.jhydrol.2012.05.007.
[53]
Vadas, P.A.; Gburek, W.J.; Sharpley, A.N.; Kleinman, P.J.A.; Moore, P.A.; Cabrera, M.L.; Harmel, R.D. A model for phosphorus transformation and runoff loss for surface-applied manures. J. Environ. Qual. 2007, 36, 324–332, doi:10.2134/jeq2006.0213.
[54]
Haygarth, P.M.; Condron, L.M.; Heathwaite, A.L.; Turner, B.L.; Harris, G.P. The phosphorus transfer continuum: Linking source to impact with an interdisciplinary and multi-scaled approach. Sci. Tot. Environ. 2005, 344, 5–14, doi:10.1016/j.scitotenv.2005.02.001.
