Abstract
A Multi-sectoral Systems Analysis (MSA) methodology is presented as a tool for identifying the level of importance of flows of energy and materials (water, nitrogen, phosphorus, and carbon) as they pass through an anthropogenically manipulated system. That system comprises a web of processes, across a total of five industrial sectors: water, forestry, food, energy and waste management. Given the heterogeneous nature and quality of data sources, the propagation of data uncertainty is considered through a Regionalized Sensitivity Analysis (RSA) procedure, based on the Monte Carlo simulation approach. The MSA reveals the advantages of studying different material cycles simultaneously, in addition to interpreting them individually, while gaining insight into the magnitude of the associated flows. The proposed framework is illustrated for a case study of the Upper Chattahoochee Watershed, in which parts of Metro Atlanta are located. Results show that natural flows are predominant in the water and energy cycles. Direct human manipulations of water, i.e., withdrawals for public supply and power generation, are less than 25% of the amount received as precipitation. Solar input is 200 times the total demand for electricity. Apart from sun-light, gasoline for transportation is the flow with the largest content of energy; it is responsible for providing 71% of the total demand of fuels for uses other than power generation. In contrast, cycles of nutrients such as N and C are strongly related to the flows of fuels, mainly coal and natural gas. In a second tier, fertilizer use and the poultry industry in the region are significant for the use of nitrogen. Phosphorus fluxes are similarly dominated by the food sector and, as a consequence, to a lesser extent by the water sector, because of water’s role as a waste-conveyance medium.
Similar content being viewed by others
References
Ahn H, James RT (2001) Variability, uncertainty, and sensitivity of phosphorus deposition load estimates in South Florida. Water Air Soil Pollut 126(1/2):37–51
Alexander A, Burklin C, Singleton A (2005) Landfill Gas Emissions Model (LandGEM) user’s guide, version 3.02. Tech. rep., Office of Research and Development, US Environmental Protection Agency
Anderson K, Downing J (2006) Dry and wet atmospheric deposition of nitrogen, phosphorus and silicon in an agricultural region. Water Air Soil Pollut 176(1):351–374
Antikainen R (2007) Substance flow analysis in Finland—four case studies on N and P flows. Tech. rep., Monographs of the Boreal Environment Research No. 27. Finnish Environment Institute, Finland
Antikainen R, Haapanen R, Rekolainen S (2004) Flows of nitrogen and phosphorus in Finland—the forest industry and use of wood fuels. J Clean Prod 12(8–10):919–934
Arena U, Mastellone ML, Perugini F (2003) The environmental performance of alternative solid waste management options: a life cycle assessment study. Chem Eng J 96(1–3):207–222
Azar C, Holmberg J, Lindgren K (1996) Socio-ecological indicators for sustainability. Ecol Econ 18:89–112
Baker LA, Hope D, Xu Y, Edmonds J, Lauver L (2001) Nitrogen balance for the Central Arizona-Phoenix (CAP) ecosystem. Ecosystems 4(6):582–602
Baker L, Hartzheim P, Hobbie S, King J, Nelson K (2007) Effect of consumption choices on fluxes of carbon, nitrogen and phosphorus through households. Urban Ecosyst 10:97–117
Barber NL (2009) Summary of estimated water use in the united states in 2005: U.S. geological survey fact sheet 2009-3098. Tech. rep., U.S. Geologycal Survey
Barczak S, Das K, Kilpatrick R (2005) Water quality implications of bio-fuels development in Georgia. In: Hatcher K (ed) Georgia water resources conference. The University of Georgia, Athens, Georgia
Barles S (2007) Feeding the city: food consumption and flow of nitrogen, Paris, 1801–1914. Sci Total Environ 375(1–3):48–58
Barles S (2009) Urban metabolism of Paris and its region. J Ind Ecol 13(6):898–913
Bauer D (2009) Environmental policy: a growing opportunity for material flow analysis. J Ind Ecol 13(5):666–669
Baxter LL, Mitchell RE, Fletcher TH, Hurt RH (1996) Nitrogen release during coal combustion. Energy Fuels 10(1):188–196
Beck MB (2005) Vulnerability of water quality in intensively developing urban watersheds. Environ Model Softw 20(4):379–380
Beck MB, Cummings RG (1996) Wastewater infrastructure: challenges for the sustainable city in the new millennium. Habitat Intl 20(3):405–420
Beck MB, Chen J, Saul AJ, Butler D (1994) Urban drainage in the 21st century: assessment of new technology on the basis of global material flows. Water Sci Technol 30(2):1–12
Beck MB, Jiang F, Shi F, Villarroel Walker R, Osidele OO, Lin Z, Demir I, Hall JW (2010) Re-engineering cities as forces for good in the environment. Proc Inst Civ Eng-Eng Sustain 163(1):31–46
Beck MB, Gupta HV, Rastetter E, Shoemaker C, Tarboton D, Butler R, Edelson D, Graber H, Gross L, Harmon T, McLaughlin D, Paola C, Peters D, Scavia D, Schnoor JL, Weber L (2009) Grand challenges of the future for environmental modeling. Tech. rep., National Science Foundation
Bjorklund A, Dalemo M, Sonesson U (1999) Evaluating a municipal waste management plan using ORWARE. J Clean Prod 7(4):271–280
Boyer EW, Goodale CL, Jaworski NA, Howarth RW (2002) Anthropogenic nitrogen sources and relationships to riverine nitrogen export in the northeastern USA. Biogeochemistry 57–58(1):137–169
Browne D, O’Regan B, Moles R (1994) A comparative analysis of the application of sustainability metric tools using Tipperary Town, Ireland, as a case study. Changes pp 44–48
Brunner PH, Rechberger H (2003) Practical handbook of material flow analysis. Lewis Publishers, Boca Raton, FL
Butalia T, Wolfe W, Dick W, Resources N, Limes D, Stowell R (1999) Coal combustion products, report AEX-330-99
Canadell JG, Ciais P, Dhakal S, Le Quéré C, Patwardhan A, Raupach MR (2009) The human perturbation of the carbon cycle. Tech. rep., UNESCO-SCOPE-UNEP
Chapman MJ, Peck MF (1997) Ground-water resources of the Upper Chattahoochee river basin in Georgia—Subarea 1 of the Apalachicola-Chattahoochee-Flint and Alabama-Coosa-Tallapoosa River basins
Cordell D, Drangert J-O, White S (2009) The story of phosphorus: global food security and food for thought. Glob Environ Change 19(2):292–305
Côté R, Grant J, Weller A, Zhu Y, Toews C (2006) Industrial ecology and the sustainability of Canadian cities. Tech. rep., Eco-efficiency Centre, Dalhousie University. Available online at http://eco-efficiency.management.dal.ca/Files/Industrial_ecology_and_Canadian_cities.pdf. Accessed Aug 2010
Crutzen PJ, Beck MB, Thompson M (2007) Cities blue ribbon panel on grand challenges for engineering. US National Academy of Engineering. Available online http://www.engineeringchallenges.org. Last accessed 18 Nov 2009. Also published in Options, Winter 2007, p 8, International Institute for Applied Systems Analysis, Laxenburg, Austria
Currie WS, Yanai RD, Piatek KB, Prescott CE, Goodale CL (2003) Processes affecting carbon storage in the forest floor and in downed woody debris. In: Kimble JM, Lal R, Birdsey R, Heath LS (eds) The potential of U.S. forest soils to sequester carbon and mitigate the greenhouse effect. CRC Press LLC, pp 135–157
Danius L, Burström F (2001) Regional material flow analysis and data uncertainties: can the results be trusted? In: Hilti LM, Giligen PW (eds) 15th international symposium on informatics for environmental protection. Zurich, Switzerland, pp 10–12
Decker EH, Elliott S, Smith FA, Blake DR, Rowland FS (2000) Energy and material flow through the urban ecosystem. Annu Rev Energy Environ 25(1):685–740
Deelstra T, Girardet H (2000) Urban agriculture and sustainable cities. In: Bakker N, Dubbeling M, Guendel S, Sabel Koschella U, de Zeeuw H (eds) Growing cities, growing food: urban agriculture on the policy agenda. A reader on urban agriculture, DSE, Feldafing, Deutschland, pp 43–65
Dixon P, Mote T (2003) Patterns and causes of atlanta’s urban heat island-initiated precipitation. J Appl Meterol 42(9):1273–1284
Dowdell RJ, Mian MH (1982) Fate of nitrogen applied to agricultural crops with particular reference to denitrification [and discussion]. Philos Trans R Soc Lond B Biol Sci 296(1082):363–373
Doyle P (1990) Modelling catchment evaporation: An objective comparison of the Penman and Morton approaches. J Hydrol 121(1–4):257–276
Dunne T, Leopold LB (1978) Water in environmental planning. WH Freeman, New York
Eghball B, Power JF, Gilley JE, Doran JW (1997) Nutrient, carbon, and mass loss during composting of beef cattle feedlot manure. J Environ Qual 26(1):189–193
Eghball B, Wienhold BJ, Woodbury BL, Eigenberg RA (2005) Plant availability of phosphorus in swine slurry and cattle feedlot manure. Agron J 97(2):542–548
EIA (2010) Annual energy review 2009, Report No. DOE/EIA–0384. US Energy Information Administration. Available online http://www.eia.gov/emeu/aer/. Last accessed June 2011
EIA (2011) Residential energy consumption survey (RECS). US Energy Information Administration. Available online http://www.eia.gov/consumption/residential/. Last accessed June 2011
Emmerth PP, Bayne DR (1996) Urban influence on phosphorus and sediment loading of West Point Lake, Georgia. Water Resour 32(1):145–154
EPA (2010) Municipal solid waste in the United States: 2009 facts and figures. Tech. rep., US Environmental Protection Agency
FAO (1986) Wood gas as engine fuel. Tech. rep., Food and Agriculture Organization of the United Nations. Available online http://www.fao.org/docrep/T0512E/T0512e00.htm. Last accessed Feb 2010
FAO (2009) Food balance sheet for US in 2000. Food and Agriculture Organization of the United Nations. Available online http://faostat.fao.org/. Last accessed 10 Feb 2010
Feeley TJ III, Skone TJ, Stiegel Jr GJ, McNemar A, Nemeth M, Schimmoller B, Murphy JT, Manfredo L (2008) Water: a critical resource in the thermoelectric power industry. Energy 33(1):1–11
Forkes J (2007) Nitrogen balance for the urban food metabolism of Toronto, Canada. Resour Conserv Recycl 52(1):74–94
GAEPD (2006) Georgia energy review 2005. Tech. rep., Division of Energy Resources of the Georgia Environmental Facilities Authority and Environmental Protection Division Department of Natural Resources
Gale ES, Sullivan DM, Cogger CG, Bary AI, Hemphill DD, Myhre EA (2006) Estimating plant-available nitrogen release from manures, composts, and specialty products. J Environ Qual 35(6):2321–2332
GAPOWER (2011a) Facts and figures of Georgia power facilities. Georgia power. Available online at http://www.georgiapower.com/about/facts.asp. Last accessed 5 June 2011
GAPOWER (2011b) Plant mcdounough. natural gas: providing for a cleaner future. Georgia Power. Available online at http://www.georgiapower.com/generation/brochure_final.pdf. Last accessed 5 June 2011
Grimmond CSB, Oke TR (1986) Urban water balance 2. results from a suburb of Vancouver, British Columbia. Water Resour Res 22(10):1404–1412
Grimmond CSB, Oke TR (2002) Turbulent heat fluxes in urban areas: observations and a Local-scale urban meteorological parameterization scheme (LUMPS). J Appl Meterol 41(7):792–810
Hao X, Chang C, Larney FJ (2004) Carbon, nitrogen balances and greenhouse gas emission during cattle feedlot manure composting. J Environ Qual 33(1):37–44
Hashimoto S, Moriguchi Y (2004) Proposal of six indicators of material cycles for describing society’s metabolism: from the viewpoint of material flow analysis. Resour Conserv Recycl 40(3):185–200
Hedbrant J, Sörme L (2001) Data vagueness and uncertainties in urban heavy-metal data collection. Water, Air and Soil Pollution: Focus 1(3–4):43–53
Hillman T, Ramaswami A (2010) Greenhouse gas emission footprints and energy use benchmarks for eight US cities. Environ Sci Technol 44(6):1902–1910
Hornberger GM, Spear RC (1980) Eutrophication in peel inlet—i. the problem-defining behavior and a mathematical model for the phosphorus scenario. Water Res 14(1):29–42
Hosier RH (1993) Urban energy systems in Tanzania: a tale of three cities. Energy Policy 21(5):510–523
Howard JL (2007) U.S. timber production, trade, consumption, and price statistics 1965 to 2005. Tech. rep., U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. Research Paper FPL-RP-637
Hower JC, Robl TL, Anderson C, Thomas GA, Sakulpitakphon T, Mardon SM, Clark WL (2005) Characteristics of coal combustion products (CCP’s) from Kentucky power plants, with emphasis on mercury content. Fuel 84(11):1338–1350
Huang SL, Lee CL, Chen CW (2006) Socioeconomic metabolism in Taiwan: emergy synthesis versus Material Flow Analysis. Resour Conserv Recycl 48(2):166–196
Hutson SS, Barber NL, Kenny JF, Linsey KS, Lumia DS, Maupin MA (2005) Estimated use of water in the United States in 2000: U.S. Geological Survey circular 1268. Tech. rep., USGS
IPCC (2006a) Guidelines for national greenhouse gas inventories. Tech. rep., volume 4: agriculture, forestry and other land use, chapter 11: N2O emissions from managed soils, and CO2 emissions from lime and urea application. Intergovernmental Panel on Climate Change
IPCC (2006b) Guidelines for national greenhouse gas inventories. Tech. rep., volume 2: energy, chapter 3: mobile combustion. Intergovernmental Panel on Climate Change
IPCC (2007) Climate change 2007: Synthesis report. Intergovernmental Panel on Climate Change. Available online http://www.ipcc.ch/. Last accessed 10 Feb 2010
Jaworski NA, Groffman PM, Keller AA, Prager JC (1992) A watershed nitrogen and phosphorus balance: the Upper Potomac River Basin. Estuaries 15(1):83–95
JJG (2000) Chapter 3: Comprehensive inventory. in ‘Chattahoochee River greenway planning and implementation handbook’. Tech. rep., Jordan, Jones, & Goulding, Inc. Available online at http://www1.gadnr.org/greenspace/c_index.html. Last accessed 10 Feb 2010
JJG (2003a) Long-term wastewater management plan. Jordan, Jones & Goulding, Inc. Prepared for Metropolitan North Georgia Water Planning District
JJG (2003b) Water supply and water conservation management plan. Jordan, Jones & Goulding, Inc. Prepared for Metropolitan North Georgia Water Planning District
Johnes PJ (1996) Evaluation and management of the impact of land use change on the nitrogen and phosphorus load delivered to surface waters: the export coefficient modelling approach. J Hydrol 183(3–4):323–349
Johnke B (2000) Emissions from waste incineration. In: Penman J, Gytarsky M, Hiraishi T, Krug T, Kruger D, Pipatti R, Buendia L, Miwa K, Ngara T, Tanabe K, Wagner F (eds) IPCC good practice guidance and uncertainty management in national greenhouse gas inventories. Institute for Global Environmental Strategies
Kambara S, Takarada T, Toyoshima M, Kato K (1995) Relation between functional forms of coal nitrogen and NOx emissions from pulverized coal combustion. Fuel 74(9):1247–1253
Kawamura K, Steinberg S, Ng L, Kaplan IR (2001) Wet deposition of low molecular weight mono- and di-carboxylic acids, aldehydes and inorganic species in Los Angeles. Atmos Environ 35(23):3917–3926
Kaye JP, Groffman PM, Grimm NB, Baker LA, Pouyat RV (2006) A distinct urban biogeochemistry? Trends Ecol Evol 21(4):192–199
Kennedy C, Cuddihy J, Engel-Yan J (2007) The changing metabolism of cities. J Ind Ecol 11(2):43–59
Kenway SJ, Lant PA, Priestley A, Daniels P (2011) The connection between water and energy in cities: a review. Water Sci Technol 63(9):1983–1990
Khan MR, Daugherty KE (1992) Clean energy from waste. In: Khan MR (ed) ACS symposium series: clean energy from waste and coal, vol 25. American Chemical Society, Washington, DC, p 30
Landry G, Waltz C, Plank CO (2002) Fertilization for lawns bulletin 710. Tech. rep., Cooperative Extension Service, The University of Georgia. Available online http://pubs.caes.uga.edu/caespubs/pubcd/B710.htm. Last accessed 17 June 2009
Lang DJ, Binder CR, Stauffacher M, Ziegler C, Schleiss K, Scholz RW (2006) Material and money flows as a means for industry analysis of recycling schemes: a case study of regional bio-waste management. Resour Conserv Recycl 49(2):159–190
Larsen TA, Lienert J (2007) Novaquatis final report. NoMix—a new approach to urban water management. Tech. rep., Eawag, 8600 Duebendorf, Switzerland
Lewis NS, Nocera DG (2006) Powering the planet: chemical challenges in solar energy utilization. Proc Natl Acad Sci 103(43):15,729–15,735
Logan BE, Guiot SR, Pavlostathis SG, van Lier JB (2005) Simultaneous wastewater treatment and biological electricity generation. Water Sci Technol 52(1–2):31–37
Lohse KA, Hope D, Sponseller R, Allen JO, Grimm NB (2008) Atmospheric deposition of carbon and nutrients across an arid metropolitan area. Sci Total Environ 402(1):95–105
Lundin M, Bengtsson M, Molander S (2000) Life cycle assessment of wastewater systems: influence of system boundaries and scale on calculated environmental loads. Environ Sci Technol 34(1):180–186
Lundin M, Olofsson M, Pettersson GJ, Zetterlund H (2004) Environmental and economic assessment of sewage sludge handling options. Resour Conserv Recycl 41(4):255–278
Mahowald N, Jickells TD, Baker AR, Artaxo P, Benitez-Nelson CR, Bergametti G, Bond TC, Chen Y, Cohen DD, Herut B, Kubilay N, Losno R, Luo C, Maenhaut W, McGee KA, Okin GS, Siefert RL, Tsukuda S (2008) Global distribution of atmospheric phosphorus sources, concentrations and deposition rates, and anthropogenic impacts. Glob Biogeochem Cycles 22(4):1–19
Mallick RB, Chen BL, Bhowmick S (2009) Harvesting energy from asphalt pavements and reducing the heat island effect. Int J Sust Eng 2(3):214–228
Matsubae K, Kajiyama J, Hiraki T, Nagasaka T (2011) Virtual phosphorus ore requirement of Japanese economy. Chemosphere 84(6):767–772
Maurer M, Schwegler P, Larsen T (2003) Nutrients in urine: energetic aspects of removal and recovery. Water Sci Technol 48(1):37–46
McDonough W, Braungart M (2002) Cradle to cradle: remaking the way we make things. North Point Press, New York
Mines RO Jr, Behrend GR, Holmes Bell G (2004) Assessment of AWT systems in the metro atlanta area. J Environ Manag 70(4):309–314
Mitchell VG, Mein RG, McMahon TA (2001) Modelling the urban water cycle. Environ Model Softw 16(7):615–629
Mitchell VG, Cleugh HA, Grimmond CSB, Xu J (2008) Linking urban water balance and energy balance models to analyse urban design options. Hydrol Process 22(16):2891–2900
Morf LS, Buser AM, Taverna R, Bader HP, Scheidegger R (2008) Dynamic substance flow analysis as a valuable risk evaluation tool—a case study for brominated flame retardants as an example of potential endocrine disrupters. Chimia International Journal for Chemistry 62(8):424–431
NARSAL (2006) Georgia land use trends (GLUT). University of Georgia, Institute of Ecology, Natural Resources Spatial Analysis Laboratory, Athens, GA
Neset TSS, Bader HP, Scheidegger R, Lohm U (2008) The flow of phosphorus in food production and consumption—Linköping, Sweden, 1870–2000. Sci Total Environ 396(2–3):111–120
NRC (1961) Nutrient requirements of poultry. World’s Poult Sci J 17(02):140–166
NRC (1987) Predicting feed intake of food-producing animals. National Academy Press. National Research Council, Committee on Animal Nutrition, Board on Agriculture, Washington, DC. Available online http://www.nap.edu/openbook.php?isbn=030903695X. Last accessed 10 Feb 2010
NRC (1998) Nutrient requirements of Swine, 10th edn. National Academy Press. Subcommittee on Swine Nutrition, Committee on Animal Nutrition, Board on Agriculture, National Research Council. Available online http://www.nap.edu/. Last accessed 10 Feb 2010
NRC (2000) Nutrient requirements of beef cattle, 7th edn. National Academy Press. Subcommittee on Beef Cattle Nutrition, Committee on Animal Nutrition, Board on Agriculture, National Research Council, Washington, DC. Available online http://www.nap.edu/. Last accessed 10 Feb 2010
Ohlström MO, Lehtinen KEJ, Moisio M, Jokiniemi JK (2000) Fine-particle emissions of energy production in Finland. Atmos Environ 34(22):3701–3711
Öquist MG, Wallin M, Seibert J, Bishop K, Laudon H (2009) Dissolved inorganic carbon export across the soil/stream interface and its fate in a boreal headwater stream. Environ Sci Technol 43(19):7364–7369
Osidele OO, Zeng W, Beck MB (2003) Coping with uncertainty: a case study in sediment transport and nutrient load analysis. J Water Resour Plan Manage 129(4):345–355
Peters GP (2010) Carbon footprints and embodied carbon at multiple scales. Curr Opin Environ Sustain 2(4):245–250
Prairie YT, Duarte CM (2007) Direct and indirect metabolic CO2 release by humanity. Biogeosciences 4(2):215–217
Preusch PL, Adler PR, Sikora LJ, Tworkoski TJ (2002) Nitrogen and phosphorus availability in composted and uncomposted poultry litter. J Environ Qual 31(6):2051–2057
Rao PD, Walsh DE (1997) Nature and distribution of phosphorus minerals in cook inlet coals, Alaska. Int J Coal Geol 33(1):19–42
Raveh A, Avnimelech Y (1979) Leaching of pollutants from sanitary landfill models. J Water Pollut Con F 51(11):2705–2716
Rees W, Wackernagel M (1996) Urban ecological footprints: why cities cannot be sustainable and why they are a key to sustainability. Environ Impact Asses Rev 16(4):223–248
Reicher Z, Throssell C (1998) Fertilizing established lawns AY-22. Tech. rep., Cooperative Extension Agency, Purdue University
Reynolds TD, Richards PA (1977) Unit operations and processes in environmental engineering, 2nd edn. PWS Publishing Company, Boston
Risse M (2009) Land application of livestock and poultry manure. Cooperative Extension Agency, The University of Georgia. Circular 826. Available online http://pubs.caes.uga.edu/caespubs/pubcd/C826/C826.htm. Last accessed 10 Feb 2010
Roberts TL, Stewart WM (2002) Inorganic phosphorus and potassium production and reserves. Better Crops 86(2):6–7
RWBECK (2005) Georgia statewide waste characterization study. Tech. rep., R.W.Beck
Sahely HR, Dudding S, Kennedy CA (2003) Estimating the urban metabolism of canadian cities: Greater Toronto area case study. Can J Civ Eng 30(2):468–483
Sánchez L, Díez JA, Vallejo A, Cartagena MC (2001) Denitrification losses from irrigated crops in central Spain. Soil Biol Biochem 33(9):1201–1209
Schlesinger WH (1997) Biogeochemistry: an analysis of global change, 2nd edn. Academic Press, New York
Scott J, Beydoun D, Amal R, Low G, Cattle J (2005) Landfill management, leachate generation, and leach testing of solid wastes in australia and overseas. Crit Rev Environ Sci Technol 35:239–332
Shizas I, Bagley DM (2004) Experimental determination of energy content of unknown organics in municipal wastewater streams. J Energy Eng 130(2):45–53
Simmelsgaard SE (1998) The effect of crop, n-level, soil type and drainage on nitrate leaching from danish soil. Soil Use Manag 14(1):30–36
Sonesson U, Jönsson Ha, Mattsson B (2004) Postconsumption sewage treatment in environmental systems analysis of foods. J Ind Ecol 8(3):51–64
Spear RC, Hornberger GM (1980) Eutrophication in peel inlet—ii. identification of critical uncertainties via generalized sensitivity analysis. Water Res 14(1):43–49
Spiegelhalter T, Arch RA (2010) Biomimicry and circular metabolism for the cities of the future. In: Brebbia CA, Hernandez S, Tiezzi E (eds) The sustainable City VI: urban regeneration and sustainability, vol 129, pp 215–226
Tangsubkul N, Moore S, Waite TD (2005) Incorporating phosphorus management considerations into wastewater management practice. Environ Sci Policy 8(1):1–15
Thompson MT (1998) Forest statistics for north central Georgia, 1998. Tech. rep., U.S. Department of Agriculture, Forest Service, Southern Research Station. Available online http://www.srs.fs.usda.gov/pubs/viewpub.php?index=305. Last accessed 10 Feb 2010
Tiquia SM, Richard TL, Honeyman MS (2002) Carbon, nutrient, and mass loss during composting. Nutr Cycl Agroecosyst 62(1):15–24
Todd RL, Waider JB, Cornaby BW (1975) Significance of biological nitrogen fixation and denitrification in a deciduous forest ecosystem. In: Howell FG, Smith MH, Gentry JB (eds) Mineral cycling in southeastern ecosystems. US Department of Energy, Savannah, GA, ERDA Symposium Series, p 920
Tyson SC, Cabrera ML (1993) Nitrogen mineralization in soils amended with composted and uncomposted poultry litter. Commun Soil Sci Plant Anal 24(17):2361–2374
USDA (1994) 1992 census of agriculture Georgia. Tech. rep., National Agricultural Statistics Service (NASS), Agricultural Statistics Board of the U.S. Department of Agriculture. Available online http://www.agcensus.usda.gov/Publications/1992/index.asp. Last accessed 10 Feb 2010
USDA (2004) 2002 census of agriculture Georgia. Tech. rep., National Agricultural Statistics Service (NASS), Agricultural Statistics Board of the U.S. Department of Agriculture. Available online http://www.agcensus.usda.gov/Publications/2002/County_Profiles/Georgia/index.asp. Last accessed 10 Feb 2010
USDA (2008) U.S. fertilizer use and price. Economic Research Service and the US Department of Agriculture. Available online http://www.ers.usda.gov/Data/FertilizerUse/. Last accessed 10 Feb 2010
USDA (2009) 2007 census of agriculture georgia. Tech. rep., National Agricultural Statistics Service (NASS), Agricultural Statistics Board of the U.S. Department of Agriculture. Available online http://www.agcensus.usda.gov/Publications/2007/index.asp. Last accessed 10 Feb 2010
USGS (2009) Irrigation water use. US Geological Survey. Available online http://ga.water.usgs.gov/edu/wuir.html. Last accessed 10 Feb 2010
Villarroel Walker R (2010) Sustainbility beyond eco-efficiency: a multi-sectoral systems analysis for water, nutrients, and energy. PhD thesis, Warnell School of Forestry and Natural Resources. The University of Georgia
Villarroel Walker R, Beck MB, Hall JW(2012) Water—and nutrient and energy—systems in urbanizing watersheds. Front Environ Sci Engin (in press)
Vitousek PM, Aber JD, Howarth RW, Likens GE, Matson PA, Schindler DW, Schlesinger WH, Tilman DG (1997) Human alteration of the global nitrogen cycle: sources and consequences. Ecol Appl 7(3):737–750
WEF (2009) Thirsty energy: water and energy in the 21st century. Tech. rep., World Economic Forum in partnership with Cambridge Energy Research Associate
WHO/UNICEF (2010) Progress on sanitation and drinking water—2010 update. Tech. rep., WHO/UNICEF Joint Monitoring Programme for Water Supply and Sanitation
Wiedmann T, Minx J (2008) A definition of ‘carbon footprint’. In: Pertsova CC (ed) Ecological economics research trends. Nova Science Publishers, Hauppauge, NY, pp 1–11
Wilsenach J, Van Loosdrecht M (2003) Impact of separate urine collection on wastewater treatment systems. Water Sci Technol 48(1):103–110
Wolman A (1965) The metabolism of cities. Sci Am 213(3):179–190
Acknowledgements
The work on which this paper is based is part of an international, inter-disciplinary network of research—the CFG Network (www.cfgnet.org). CFG was begun in 2006, enabled through the appointment at that time of MBB as an Institute Scholar at the International Institute for Applied Systems Analysis (IIASA), Laxenburg, Austria. We readily acknowledge this stimulus to our work. Throughout, CFG has been funded by the Wheatley-Georgia Research Alliance endowed Chair in Water Quality and Environmental Systems at the University of Georgia, in particular, in support of a Graduate Assistantship and now Postdoctoral Fellowship for RVW. The freedom of enquiry enabled through this form of financial support has simply been invaluable. The authors would also like to thank the two anonymous reviewers for their thorough and insightful comments.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Villarroel Walker, R., Beck, M.B. Understanding the metabolism of urban-rural ecosystems. Urban Ecosyst 15, 809–848 (2012). https://doi.org/10.1007/s11252-012-0241-8
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11252-012-0241-8