hill


Alan R Hill

Department of Geography

Professor Emeritus

Email: hill@yorku.ca


My research examines the interactions between biogeochemistry and hydrology that regulate stream chemistry in temperate landscapes. I focus on analyzing the role of the near-stream (riparian) zone and the hyporheic zone (the zone of stream water and subsurface water mixing in stream beds) in regulating the biogeochemistry of nitrogen and other mineral elements in agricultural and forested watersheds.

More...

Degrees

Ph.D. (Geography), Queen's University, Belfast
B.A. (Geography), Queen's University, Belfast

Research Interests

, Biogeochemistry, Hydrology, Wetlands, Riparian buffer zones and Streams
Books

Publication
Year

Found, W.C.; A.R. Hill and E.S. Spence, 1975. Economic and Environmental Impacts of Land Drainage in Ontario Geographical Monographs No. 6, Atkinson College, Department of Geography, York University, 175pp.

1975

Book Chapters

Publication
Year

Hill, A.R., 2000. Stream chemistry and riparian zones, in Jones, J. and P. Mulholland (eds), Streams and Groundwaters. Academic Press, New York, p. 84-110.

2000

Hill, A.R., 2000. Beta diversity, p. 48; Carrying capacity, p. 67; Density dependence, p. 118; Ecotype, p. 149; Edaphic, p. 149; r and K selection, p. 371B372; Stability, p. 403B405; Tolerance, p. 438. In Goudie, A. (ed) The Encyclopedic Dictionary of Physical Geography, 3rd edn. Blackwell Ltd., Oxford.

2000

Hill, A.R., 1997. The potential role of in-stream and hyporheic environments as buffer zones, in Haycock, N.E., T.P. Burt, K.W.T. Goulding and G. Pinay (eds), Buffer Zones: Their Processes and Potential in Water Protection. U.K. p. 115-127.

1997

Hill, A.R. and K.J. Devito, 1996. Hydrologic-chemical interactions in headwater forest wetlands, in Trettin, C.C., M.F. Jurgensen, D.F. Grigal, M.R. Gale and J. Jeglum (eds), Northern Forested Wetlands: Ecology and Managment. CRC/Lewis Publisher, Boca Raton Florida, p. 217-233.

1996

Hill, A.R., 1983. Nitrate-nitrogen mass balances for two Ontario rivers, in T.D. Fontaine and S.M. Bartell (eds.), Dynamics of Lotic Ecosystems, Ann Arbor Science. Ann Arbor, Michigan, 457-477.

1983

Hill, A.R., 1970. The relationship of drumlins to the directions of ice movement in North County Down, in Irish Geographical Studies, (ed.) N. Stephens and R. Glasscock, 53-59. Queen's University Press.

1970

Journal Articles

Publication
Year

Hill A.R. 2018. Landscape hydrogeology and its influence on patterns of groundwater flux and nitrate removal efficiency in riparian buffers. Journal of the American Water Resources Association (in press).

2018

Hill A.R and Sadowski E.K. 2016. Chloride concentrations in wetlands along a rural to urban land use gradient. Wetlands 36: 73-83.

2016

Hill A.R., Devito K.J. and Vidon P.G. 2014. Long-term nitrate removal in a stream riparian zone. Biogeochemistry 121: 425-439.

2014

Hill A.R. 2012. The impact of pipe flow in riparian peat deposits on nitrate transport and removal. Hydrological Processes 26: 3135-3146.

2012

Bravo D. and Hill A.R. 2012. The effect of chronic high groundwater nitrate loading on riparian forest growth and plant-soil processes. Water Air and Soil Pollution 223: 73-84.

2012

Hill A.R. 2011. Buried organic-rich horizons: their role as nitrogen sources in stream riparian zones. Biogeochemistry 104: 347-363.

2011

Shabaga J.A. and Hill A.R. 2010. Groundwater-fed surface flow path hydrodynamics and nitrate removal in three riparian zones in southern Ontario, Canada. Journal of Hydrology 388: 52-64.

2010

Hill A.R. and Duval T.P. 2009. Beaver dams along an agricultural stream in southern Ontario, Canada: their impact on riparian zone hydrology and nitrogen chemistry. Hydrological Processes 23: 1324-1336.

2009

Kasahara T. and A R. Hill 2008. Modeling the effects of lowland stream restoration projects on stream-subsurface water exchange. Ecological Engineering 32: 310-319.

2008

Kasahara T. and A.R. Hill 2007. Lateral hyporheic zone chemistry in an artificially constructed gravel bar and a re-meandering stream channel, southern Ontario, Canada. Journal of the American Water Resources Association 43: 1-13.

2007

Duval T.P. and A.R. Hill 2007. Influence of base flow stream bank seepage on riparian zone nitrogen biogeochemistry. Biogeochemistry 85:185-199.

2007

Kasahara T. and A. R. Hill 2007. Instream restoration: its effects on lateral stream-subsurface water exchange in urban and agricultural streams in southern Ontario. River Research and Applications 23: 1-14.

2007

Duval T.P. and A.R. Hill 2006. Influence of stream bank seepage during low flow conditions on riparian zone hydrology. Water Resources Research doi:10.1029/2006WR004861.

2006

Vidon P. and A.R. Hill 2006. A landscape based approach to estimate riparian hydrological and nitrate removal functions. Journal of the American Water Resources Association 42: 1099-1112.

2006

Kasahara T and A.R. Hill, 2006. Effects of riffle/step restoration on hyporheic zone chemistry in N-rich lowland streams. Canadian Journal of Fisheries and Aquatic Sciences 63: 120-133.

2006

Kasahara T. and A.R. Hill, 2006. Hyporheic exchange flows induced by constructed riffles and steps in lowland streams. Hydrological Processes 20: 4287-4305.

2006

Vidon, P. and A.R. Hill, 2004. Denitrification and patterns of electron donors and acceptors in 8 riparian zones with contrasting hydrogeology. Biogeochemistry 71, 259-283.

2004

Hill, A.R., P. Vidon and J. Langat, 2004. Denitrification potential in relation to lithology in five headwater riparian zones. Journal of Environmental Quality, 33, 911-919.

2004

Vidon, P. and A.R. Hill, 2004. Landscape controls on nitrate removal in stream riparian zones. Water Resources Research, 40, 03201.D01: 1029/2003 WR 002473.

2004

Vidon, P. and A.R. Hill, 2004. Landscape controls on the hydrology of stream riparian zones. Journal of Hydrology, 292: 210-228.

2004

Hill, A.R. and M. Cardaci, 2004. Denitrification and organic carbon availability in riperian wetland soils and subsurface sediments. Soil Science Society of America Journal, 682: 320-325.

2004

Carlyle, G.C. and A.R. Hill, 2001. Groundwater phosphate dynamics in a river riparian zone: effects of hydrologic flowpaths, lithology and redox chemistry. Journal of Hydrology, 247, 151-168.

2001

Buttle, J.M., S.W. Lister and A.R. Hill, 2001. Controls on runoff components on a forested slope and implications for N transport. Hydrological Processes, 15, 1065-1070.

2001

Hill, A.R., K.J. Devito, S. Campagnolo and K. Sanmugadas, 2000. Subsurface denitrification in a forest riparian zone: interactions between hydrology and supplies of nitrate and organic carbon. Biogeochemistry, 51, 193-223.

2000

Devito, K.J., D. Fitzgerald, A.R. Hill and R. Aravena, 2000. Nitrate dynamics in relation to lithology and hydologic flow path in a river riparian zone. Journal of Environmental Quality, 29, 1075-1084.

2000

Brassard, P., J.M. Waddington, A.R. Hill and N.T. Roulet, 2000. Modelling groundwater-surface water mixing in a headwater wetland: implications for hydrograph separation. Hydrological Processes, 14, 2697-2710.

2000

Hill, A.R., W.A. Kemp, J.M. Buttle and D. Goodyear, 1999. Nitrogen dynamics of subsurface storm runoff on forested Canadian Shield hillslopes. Water Resources Research, 35: 811-824.

1999

Devito, K.J. and A.R. Hill, 1999. Sulphate mobilization and pore water chemistry in relation to groundwater hydrology and summer drought in two conifer swamps on the Canadian Shield. Water, Air and Soil Pollution, 113: 97-114.

1999

Devito, K.J., A.R. Hill and P.J. Dillon, 1999. Episodic sulphate export from wetlands in acidified headwater catchments: prediction at the landscape scale. Biogeochemistry, 44: 187-203.

1999

Hill, A.R., C.F. Labadia and K. Sanmugadas, 1998. Hyporheic zone, hydrology and nitrogen dynamics in relation to the streambed topography of a N-rich stream. Biogeochemistry, 42: 285-310.

1998

Hill, A.R. and D. J. Lymburner, 1998. Hyporheic zone chemistry and stream-subsurface exchange in two groundwater-fed streams. Canadian Journal of Fisheries and Aquatic Sciences, 55: 495-506.

1998

Devito, K.J. and A.R. Hill, 1997. Sulphate dynamics in relation to groundwater-surface water interactions in headwater wetlands of the southern Canadian Shield. Hydrological Processes, 11, 485-500.

1997

Hill, A.R. 1996. Nitrate removal in stream riparian zones. Journal of Environmental Quality, 25, 743-755.

1996

Hill, A.R. and A.M. Brooks, 1996. Coarse particulate organic matter inputs to a headwater swamp stream. Archives fur Hydrobiologia, 137, 25-38.

1996

Devito, K.J., A.R. Hill and N. Roulet, 1996. Groundwater-surface water interactions in headwater forested wetlands of the Canadian Shield. Journal of Hydrology, 181, 127-147.

1996

Hill, A.R. 1993. Base cation chemistry of storm runoff in a forested headwater wetland. Water Resources Research, 29, 2663-2673.

1993

Hill, A.R. 1993. Nitrogen dynamics of storm runoff in the riparian zone of a forested watershed. Biogeochemistry, 20, 19-44.

1993

Allan, C.J.; N.T. Roulet and A.R. Hill, 1993. The biogeochemistry of pristine, headwater Precambrian shield watersheds: an analysis of material transport within a heterogenous landscape. Biogeochemistry, 22, 37-79.

1993

Waddington, J.M.; N.T. Roulet and A.R. Hill, 1993. Runoff mechanisms in a forested groundwater discharge wetland. Journal of Hydrology, 147, 37-60.

1993

Hill, A.R. 1991. A groundwater nitrogen budget for a headwater swamp in an area of permanent groundwater discharge. Biogeochemistry, 14, 209-224.

1991

Hill, A.R. 1990. Groundwater cation concentrations in the riparian zone of a forested headwater stream. Hydrological Processes 4, 121-130.

1990

Hill, A.R. 1990. Groundwater flow paths in relation to nitrogen chemistry in the near-stream zone. Hydrobiologia 206, 39-52.

1990

Hill, A.R. 1990. The biogeochemistry of small headwater wetlands. The Canadian Geographer, 34, 85-86.

1990

Hill, A.R. and M. Shackleton, 1989. Soil N mineralization and nitrification in relation to nitrogen solution chemistry in a small forested watershed. Biogeochemistry, 8, 167-184.

1989

Hill, A.R. 1988. Factors influencing nitrate depletion in a rural stream. Hydrobiologia, 160, 111-122.

1988

Hill, A.R. 1987. Ecosystem stability: Some recent perspectives. Progress in Physical Geography, 11, 315-333.

1987

Hill, A.R. and J. Warwick, 1987. Ammonium transforma¬tions in springwater within the riparian zone of a small woodland stream. Canadian Journal of Fisheries and Aquatic Sciences, 44, 1948-1956.

1987

Hill A.R. 1986. Nitrate and chloride distribution and balance under continuous potato cropping. Agriculture, Ecosystems and Environment, 15, 267-280.

1986

Hill, A.R. 1986. Nitrate nitrogen transformations in rural streams. Canadian Water Resources Journal, 11, 126-134.

1986

Hill, A.R. 1986. Stream nitrate-N loads in relation to variations in annual and seasonal runoff regimes. Water Resources Bulletin, 22, 829-839.

1986

Hill, A.R. and K. Sanmugadas, 1985. Denitrification rates in relation to stream sediment characteristics. Water Research, 19, 1579-1586.

1985

Wyer, M.D. and A.R. Hill, 1984. Nitrate transformations in Southern Ontario stream sediments. Water Resources Bulletin, 20, 729-737.

1984

Hill, A.R. 1983. Denitrification: Its importance in a river draining an intensively cropped watershed. Agriculture, Ecosystems and Environment, 10, 47-62.

1983

Hill, A.R. 1982. Phosphorus and major cation mass balances for two rivers during low summer flows. Freshwater Biology, 12, 293-304.

1982

Hill, A.R. 1982. Nitrate distribution in the ground water of the Alliston region of Ontario, Canada. Ground Water, 20, 696-702.

1982

Hill, A.R. 1981. Nitrate-nitrogen flux and utilization in a stream ecosystem during low summer flows. The Canadian Geographer, 25, 225-239.

1981

Hill, A.R. 1981. Phosphorus exports from watersheds with contrasting land uses in Southern Ontario. Water Resources Bulletin, 17, 627-634.

1981

Hill A.R. 1980. Stream cation concentrations and losses from drainage basins with contrasting land uses in Southern Ontario. Water Research, 14, 1295-1305.

1980

Hill, A.R. 1979. Denitrification in the nitrogen budget of a river ecosystem, Nature, 281, 291-292.

1979

Hill, A.R. 1978. Factors affecting the export of nitrate-nitrogen from drainage basins in Southern Ontario, Water Research, 12, 1045-1057.

1978

Hill, A.R. and N. Wylie, 1977. The influence of nitrogen fertilizers on stream nitrate concentrations near Alliston, Ontario, Canada, Progress in Water Technology, 8, 91-100.

1977

Hill A.R. 1976. The environmental impacts of agricultural land drainage, Journal of Environmental Management, 4, 251-274.

1976

Hill, A.R. 1976. The effects of man-induced erosion and sedimentation on the soils of a portion of the Oak Ridges Moraine, The Canadian Geographer, 30, 38-404.

1976

Found, W.C.; A.R. Hill and E.S. Spence, 1976. A study of the impacts of agricultural land drainage in Ontario, Journal of Soil and Water Conservation, 31, 20-24. Hill, A.R. 1975. Biogeography as a sub-field of Geography, Area, 7, 156-161.

1976

Hill, A.R. 1975. Ecosystem stability in relation to stresses caused by human activities. The Canadian Geographer, 19, 206-220.

1975

Hill, A.R. and W.P. McCague, 1974. Nitrate concentrations in streams near Alliston, Ontario as influenced by nitrogen fertilization of adjacent fields. Journal of Soil and Water Conservation 29, 217-220.

1974

Hill, A.R. 1973. The distribution of drumlins in County Down, Ireland. Annals of the Association of American Geographers 63, 226-240.

1973

Hill, A.R. 1973. Erosion of river banks composed of glacial till near Belfast, Northern Ireland. Zeitschrift für Geomorphologie 17, 428-442.

1973


My research examines the interactions between biogeochemistry and hydrology that regulate stream chemistry in temperate landscapes. I focus on analyzing the role of the near-stream (riparian) zone and the hyporheic zone (the zone of stream water and subsurface water mixing in stream beds) in regulating the biogeochemistry of nitrogen and other mineral elements in agricultural and forested watersheds.

Degrees

Ph.D. (Geography), Queen's University, Belfast
B.A. (Geography), Queen's University, Belfast

Research Interests

, Biogeochemistry, Hydrology, Wetlands, Riparian buffer zones and Streams

All Publications


Book Chapters

Publication
Year

Hill, A.R., 2000. Stream chemistry and riparian zones, in Jones, J. and P. Mulholland (eds), Streams and Groundwaters. Academic Press, New York, p. 84-110.

2000

Hill, A.R., 2000. Beta diversity, p. 48; Carrying capacity, p. 67; Density dependence, p. 118; Ecotype, p. 149; Edaphic, p. 149; r and K selection, p. 371B372; Stability, p. 403B405; Tolerance, p. 438. In Goudie, A. (ed) The Encyclopedic Dictionary of Physical Geography, 3rd edn. Blackwell Ltd., Oxford.

2000

Hill, A.R., 1997. The potential role of in-stream and hyporheic environments as buffer zones, in Haycock, N.E., T.P. Burt, K.W.T. Goulding and G. Pinay (eds), Buffer Zones: Their Processes and Potential in Water Protection. U.K. p. 115-127.

1997

Hill, A.R. and K.J. Devito, 1996. Hydrologic-chemical interactions in headwater forest wetlands, in Trettin, C.C., M.F. Jurgensen, D.F. Grigal, M.R. Gale and J. Jeglum (eds), Northern Forested Wetlands: Ecology and Managment. CRC/Lewis Publisher, Boca Raton Florida, p. 217-233.

1996

Hill, A.R., 1983. Nitrate-nitrogen mass balances for two Ontario rivers, in T.D. Fontaine and S.M. Bartell (eds.), Dynamics of Lotic Ecosystems, Ann Arbor Science. Ann Arbor, Michigan, 457-477.

1983

Hill, A.R., 1970. The relationship of drumlins to the directions of ice movement in North County Down, in Irish Geographical Studies, (ed.) N. Stephens and R. Glasscock, 53-59. Queen's University Press.

1970

Books

Publication
Year

Found, W.C.; A.R. Hill and E.S. Spence, 1975. Economic and Environmental Impacts of Land Drainage in Ontario Geographical Monographs No. 6, Atkinson College, Department of Geography, York University, 175pp.

1975

Journal Articles

Publication
Year

Hill A.R. 2018. Landscape hydrogeology and its influence on patterns of groundwater flux and nitrate removal efficiency in riparian buffers. Journal of the American Water Resources Association (in press).

2018

Hill A.R and Sadowski E.K. 2016. Chloride concentrations in wetlands along a rural to urban land use gradient. Wetlands 36: 73-83.

2016

Hill A.R., Devito K.J. and Vidon P.G. 2014. Long-term nitrate removal in a stream riparian zone. Biogeochemistry 121: 425-439.

2014

Hill A.R. 2012. The impact of pipe flow in riparian peat deposits on nitrate transport and removal. Hydrological Processes 26: 3135-3146.

2012

Bravo D. and Hill A.R. 2012. The effect of chronic high groundwater nitrate loading on riparian forest growth and plant-soil processes. Water Air and Soil Pollution 223: 73-84.

2012

Hill A.R. 2011. Buried organic-rich horizons: their role as nitrogen sources in stream riparian zones. Biogeochemistry 104: 347-363.

2011

Shabaga J.A. and Hill A.R. 2010. Groundwater-fed surface flow path hydrodynamics and nitrate removal in three riparian zones in southern Ontario, Canada. Journal of Hydrology 388: 52-64.

2010

Hill A.R. and Duval T.P. 2009. Beaver dams along an agricultural stream in southern Ontario, Canada: their impact on riparian zone hydrology and nitrogen chemistry. Hydrological Processes 23: 1324-1336.

2009

Kasahara T. and A R. Hill 2008. Modeling the effects of lowland stream restoration projects on stream-subsurface water exchange. Ecological Engineering 32: 310-319.

2008

Kasahara T. and A.R. Hill 2007. Lateral hyporheic zone chemistry in an artificially constructed gravel bar and a re-meandering stream channel, southern Ontario, Canada. Journal of the American Water Resources Association 43: 1-13.

2007

Duval T.P. and A.R. Hill 2007. Influence of base flow stream bank seepage on riparian zone nitrogen biogeochemistry. Biogeochemistry 85:185-199.

2007

Kasahara T. and A. R. Hill 2007. Instream restoration: its effects on lateral stream-subsurface water exchange in urban and agricultural streams in southern Ontario. River Research and Applications 23: 1-14.

2007

Duval T.P. and A.R. Hill 2006. Influence of stream bank seepage during low flow conditions on riparian zone hydrology. Water Resources Research doi:10.1029/2006WR004861.

2006

Vidon P. and A.R. Hill 2006. A landscape based approach to estimate riparian hydrological and nitrate removal functions. Journal of the American Water Resources Association 42: 1099-1112.

2006

Kasahara T and A.R. Hill, 2006. Effects of riffle/step restoration on hyporheic zone chemistry in N-rich lowland streams. Canadian Journal of Fisheries and Aquatic Sciences 63: 120-133.

2006

Kasahara T. and A.R. Hill, 2006. Hyporheic exchange flows induced by constructed riffles and steps in lowland streams. Hydrological Processes 20: 4287-4305.

2006

Vidon, P. and A.R. Hill, 2004. Denitrification and patterns of electron donors and acceptors in 8 riparian zones with contrasting hydrogeology. Biogeochemistry 71, 259-283.

2004

Hill, A.R., P. Vidon and J. Langat, 2004. Denitrification potential in relation to lithology in five headwater riparian zones. Journal of Environmental Quality, 33, 911-919.

2004

Vidon, P. and A.R. Hill, 2004. Landscape controls on nitrate removal in stream riparian zones. Water Resources Research, 40, 03201.D01: 1029/2003 WR 002473.

2004

Vidon, P. and A.R. Hill, 2004. Landscape controls on the hydrology of stream riparian zones. Journal of Hydrology, 292: 210-228.

2004

Hill, A.R. and M. Cardaci, 2004. Denitrification and organic carbon availability in riperian wetland soils and subsurface sediments. Soil Science Society of America Journal, 682: 320-325.

2004

Carlyle, G.C. and A.R. Hill, 2001. Groundwater phosphate dynamics in a river riparian zone: effects of hydrologic flowpaths, lithology and redox chemistry. Journal of Hydrology, 247, 151-168.

2001

Buttle, J.M., S.W. Lister and A.R. Hill, 2001. Controls on runoff components on a forested slope and implications for N transport. Hydrological Processes, 15, 1065-1070.

2001

Hill, A.R., K.J. Devito, S. Campagnolo and K. Sanmugadas, 2000. Subsurface denitrification in a forest riparian zone: interactions between hydrology and supplies of nitrate and organic carbon. Biogeochemistry, 51, 193-223.

2000

Devito, K.J., D. Fitzgerald, A.R. Hill and R. Aravena, 2000. Nitrate dynamics in relation to lithology and hydologic flow path in a river riparian zone. Journal of Environmental Quality, 29, 1075-1084.

2000

Brassard, P., J.M. Waddington, A.R. Hill and N.T. Roulet, 2000. Modelling groundwater-surface water mixing in a headwater wetland: implications for hydrograph separation. Hydrological Processes, 14, 2697-2710.

2000

Hill, A.R., W.A. Kemp, J.M. Buttle and D. Goodyear, 1999. Nitrogen dynamics of subsurface storm runoff on forested Canadian Shield hillslopes. Water Resources Research, 35: 811-824.

1999

Devito, K.J. and A.R. Hill, 1999. Sulphate mobilization and pore water chemistry in relation to groundwater hydrology and summer drought in two conifer swamps on the Canadian Shield. Water, Air and Soil Pollution, 113: 97-114.

1999

Devito, K.J., A.R. Hill and P.J. Dillon, 1999. Episodic sulphate export from wetlands in acidified headwater catchments: prediction at the landscape scale. Biogeochemistry, 44: 187-203.

1999

Hill, A.R., C.F. Labadia and K. Sanmugadas, 1998. Hyporheic zone, hydrology and nitrogen dynamics in relation to the streambed topography of a N-rich stream. Biogeochemistry, 42: 285-310.

1998

Hill, A.R. and D. J. Lymburner, 1998. Hyporheic zone chemistry and stream-subsurface exchange in two groundwater-fed streams. Canadian Journal of Fisheries and Aquatic Sciences, 55: 495-506.

1998

Devito, K.J. and A.R. Hill, 1997. Sulphate dynamics in relation to groundwater-surface water interactions in headwater wetlands of the southern Canadian Shield. Hydrological Processes, 11, 485-500.

1997

Hill, A.R. 1996. Nitrate removal in stream riparian zones. Journal of Environmental Quality, 25, 743-755.

1996

Hill, A.R. and A.M. Brooks, 1996. Coarse particulate organic matter inputs to a headwater swamp stream. Archives fur Hydrobiologia, 137, 25-38.

1996

Devito, K.J., A.R. Hill and N. Roulet, 1996. Groundwater-surface water interactions in headwater forested wetlands of the Canadian Shield. Journal of Hydrology, 181, 127-147.

1996

Hill, A.R. 1993. Base cation chemistry of storm runoff in a forested headwater wetland. Water Resources Research, 29, 2663-2673.

1993

Hill, A.R. 1993. Nitrogen dynamics of storm runoff in the riparian zone of a forested watershed. Biogeochemistry, 20, 19-44.

1993

Allan, C.J.; N.T. Roulet and A.R. Hill, 1993. The biogeochemistry of pristine, headwater Precambrian shield watersheds: an analysis of material transport within a heterogenous landscape. Biogeochemistry, 22, 37-79.

1993

Waddington, J.M.; N.T. Roulet and A.R. Hill, 1993. Runoff mechanisms in a forested groundwater discharge wetland. Journal of Hydrology, 147, 37-60.

1993

Hill, A.R. 1991. A groundwater nitrogen budget for a headwater swamp in an area of permanent groundwater discharge. Biogeochemistry, 14, 209-224.

1991

Hill, A.R. 1990. Groundwater cation concentrations in the riparian zone of a forested headwater stream. Hydrological Processes 4, 121-130.

1990

Hill, A.R. 1990. Groundwater flow paths in relation to nitrogen chemistry in the near-stream zone. Hydrobiologia 206, 39-52.

1990

Hill, A.R. 1990. The biogeochemistry of small headwater wetlands. The Canadian Geographer, 34, 85-86.

1990

Hill, A.R. and M. Shackleton, 1989. Soil N mineralization and nitrification in relation to nitrogen solution chemistry in a small forested watershed. Biogeochemistry, 8, 167-184.

1989

Hill, A.R. 1988. Factors influencing nitrate depletion in a rural stream. Hydrobiologia, 160, 111-122.

1988

Hill, A.R. 1987. Ecosystem stability: Some recent perspectives. Progress in Physical Geography, 11, 315-333.

1987

Hill, A.R. and J. Warwick, 1987. Ammonium transforma¬tions in springwater within the riparian zone of a small woodland stream. Canadian Journal of Fisheries and Aquatic Sciences, 44, 1948-1956.

1987

Hill A.R. 1986. Nitrate and chloride distribution and balance under continuous potato cropping. Agriculture, Ecosystems and Environment, 15, 267-280.

1986

Hill, A.R. 1986. Nitrate nitrogen transformations in rural streams. Canadian Water Resources Journal, 11, 126-134.

1986

Hill, A.R. 1986. Stream nitrate-N loads in relation to variations in annual and seasonal runoff regimes. Water Resources Bulletin, 22, 829-839.

1986

Hill, A.R. and K. Sanmugadas, 1985. Denitrification rates in relation to stream sediment characteristics. Water Research, 19, 1579-1586.

1985

Wyer, M.D. and A.R. Hill, 1984. Nitrate transformations in Southern Ontario stream sediments. Water Resources Bulletin, 20, 729-737.

1984

Hill, A.R. 1983. Denitrification: Its importance in a river draining an intensively cropped watershed. Agriculture, Ecosystems and Environment, 10, 47-62.

1983

Hill, A.R. 1982. Phosphorus and major cation mass balances for two rivers during low summer flows. Freshwater Biology, 12, 293-304.

1982

Hill, A.R. 1982. Nitrate distribution in the ground water of the Alliston region of Ontario, Canada. Ground Water, 20, 696-702.

1982

Hill, A.R. 1981. Nitrate-nitrogen flux and utilization in a stream ecosystem during low summer flows. The Canadian Geographer, 25, 225-239.

1981

Hill, A.R. 1981. Phosphorus exports from watersheds with contrasting land uses in Southern Ontario. Water Resources Bulletin, 17, 627-634.

1981

Hill A.R. 1980. Stream cation concentrations and losses from drainage basins with contrasting land uses in Southern Ontario. Water Research, 14, 1295-1305.

1980

Hill, A.R. 1979. Denitrification in the nitrogen budget of a river ecosystem, Nature, 281, 291-292.

1979

Hill, A.R. 1978. Factors affecting the export of nitrate-nitrogen from drainage basins in Southern Ontario, Water Research, 12, 1045-1057.

1978

Hill, A.R. and N. Wylie, 1977. The influence of nitrogen fertilizers on stream nitrate concentrations near Alliston, Ontario, Canada, Progress in Water Technology, 8, 91-100.

1977

Hill A.R. 1976. The environmental impacts of agricultural land drainage, Journal of Environmental Management, 4, 251-274.

1976

Hill, A.R. 1976. The effects of man-induced erosion and sedimentation on the soils of a portion of the Oak Ridges Moraine, The Canadian Geographer, 30, 38-404.

1976

Found, W.C.; A.R. Hill and E.S. Spence, 1976. A study of the impacts of agricultural land drainage in Ontario, Journal of Soil and Water Conservation, 31, 20-24. Hill, A.R. 1975. Biogeography as a sub-field of Geography, Area, 7, 156-161.

1976

Hill, A.R. 1975. Ecosystem stability in relation to stresses caused by human activities. The Canadian Geographer, 19, 206-220.

1975

Hill, A.R. and W.P. McCague, 1974. Nitrate concentrations in streams near Alliston, Ontario as influenced by nitrogen fertilization of adjacent fields. Journal of Soil and Water Conservation 29, 217-220.

1974

Hill, A.R. 1973. The distribution of drumlins in County Down, Ireland. Annals of the Association of American Geographers 63, 226-240.

1973

Hill, A.R. 1973. Erosion of river banks composed of glacial till near Belfast, Northern Ireland. Zeitschrift für Geomorphologie 17, 428-442.

1973