Foliar gas exchange, water relations and spectral properties of understorey sugar maple (Acer saccharum Marsh.) sapling leaves were studied in a natural forested ecosystem subjected to spray irrigation of municipal solid waste (MSW) landfill leachate and compared to similar measures taken from leaves of unirrigated saplings. Photosynthetic rates in irrigated saplings were reduced 34% to 53% in comparison to unirrigated sapling rates. Similarly, water use efficiency of sapling leaves subjected to direct leachate exposure dropped an average of 70%, while transpiration rates were similar to, and leaf temperatures were 20% higher than, those found in unirrigated leaves. Spectral patterns of understorey leaves, distorted because of the accumulation of leachate precipitate residues on the adaxial surface, demonstrated increased absorbance in the near infrared waveband and reduced reflection in visible wavebands compared to abaxial surfaces. The adaxial spectral properties of mid-canopy leaves (above maximum spray height) of mature sugar maple trees were not distorted by these residues and revealed spectra that suggested increased nitrogen uptake and benefit derived from leachate irrigation. These findings on leaf tissue integrity and energy budgets are discussed in terms of the implications for design of leachate treatment and disposal systems on land and for forest ecology in general.
Agriculture Canada Expert Committee on Soil Survey (A.C.E.C.S.S.). (1987), The Canadian System of Soil Classification . (2nd edition). Supply and Services Canada, Ottawa, Ontario.
2.
Anonymous. (1985), Silvicycle: Information Network of Waste Utilization in Forest Lands, (vol. 3) Institute of Forest Resources, University of Washington.
3.
Bahari, Z.A., Pallardy, S.G., & Parker, W.C. (1985), Photosynthesis, water relations and drought adaptations in six woody species of oak-hickory forests in central Missouri. ForestScience31, 557-569.
4.
Barker, J.F. (1987), Volatile aromatic and chlorinated organic contaminants in groundwater at six Ontario landfills. Water Pollution Research , 22, 33-63.
5.
Barlow, E.W.R. (1983), Water relations of the mature leaf. In The Growth and Functioning of Leaves ( J. E. Dale & F. L. Milthorpe Eds.), pp. 315-346. Cambridge Univ. Press. Cambridge.
6.
Bennett, O.L., Menser, H.A., & Winant, W.M. (1975), Land disposal of leachate from a municipal sanitary landfill. In 2nd National Conference on Complete Water Reuse, pp. 789-900. AICE and USEPA Tech. Tmns.
7.
Berry, J. & Bjorkman, O. (1980), Photosynthetic response and adaptation to temperature in higher plants. Annual Review of Plant Physiology, 31, 493-543.
8.
Boyer, M., Miller, J., Belanger, M., & Hare, E. (1988), Senescence and spectral reflectance in leaves of northern pin oak. Remote Sensing of Environment25, 71-87.
9.
Brockway, D.G. (1988), Forest land application of municipal sludge. Biocycle, 29 (5), 62-68.
10.
Card, D.H., Peterson, D.L., Matson, P.M. & Aber, J.D. (1988), Prediction of leaf chemistry by the use of visible and near-infrared reflectance spectroscopy. Remote Sensing of Environment26, 123-147.
11.
Collins, W., Chang, S.H., Raines, G., Canney, F. & Ashley, R. (1983), Airborne biogeochemical mapping of hidden mineral deposits. EconomicGeology78, 737-749.
12.
Cyr, F., Mehram, M.C. & Mallet, V.N. (1987), Leaching of chemical contaminants from a municipal landfill site. Bulletin of Environmental Contamination and Toxicology, 38, 775-782.
13.
Daughtry, C.S.T. & Biehl, L.L. (1985), Changes in spectral properties of detached birch leaves. Remote Sensing of Environment, 17, 281-289.
14.
Dwyer, L.M. & Stewart, D.W. (1986), Effect of leaf age and position on net photosynthetic rates in maize. Agricultural and ForestMeteorology, 37, 29-46.
Gausman, H.W. (1982), Visible light reflectance, transmittance and absorbance of differently pigmented cotton leaves. Remote Sensing Environment , 13, 233-238.
17.
Gausman, H.W. (1984), Evaluation of factors causing reflectance differences between sun and shade leaves. Remote Sensing Environment, 15, 177-181.
18.
Gordon, A.M., McBride, R.A., & Fisken, A.J. (1989a), The effect of landfill leachate spraying on foliar nutrient concentrations and leaf transpiration in a northern hardwood forest ecosystem, Canada. Forestry62(1), 19-28.
19.
Gordon, A.M., McBride, R.A., Fisken, A.J., & Bates, T.E. (1989b), Effect of landfill leachate irrigation on red maple (Acer rubrum L.) and sugar maple (Acer saccharum Marsh.) seedling growth and on foliar nutrient concentrations. Environmental Pollution , 56, 327-336.
20.
Grant, L. (1987), Diffuse and specular characteristics of leaf reflectance . Remote Sensing of Environment, 22, 309-322.
21.
Harrington, D.W. & Maris, P.J. (1986), The treatment of leachate: a U.K. perspective . Water Pollution Control, 85, 45-56.
22.
Hinckley, T.M., Aslin, R.G., Aubuchon, R.R., Metcalf, C.L., & Roberts, J.E. (1978), Leaf conductance and photosynthesis in four species of the oak-hickory forest type. ForestScience, 24(1), 73-84.
23.
Hinzman, L.D., Bauer, M.E., & Daughtry, C.S.T. (1986), Effects of nitrogen fertilization on growth and reflectance characteristics of winter wheat. Remote Sensing Environment, 19, 47-61.
24.
Horler, D.N.H., Dockray, M., & Barber, J. (1983), The red edge of plant reflectance. International Journal of Remote Sensing, 4(2), 273-288.
25.
Idso, S.B., Allen, S.G., & Choudhury, B.J. (1988), Problems with porometry: measuring stomatal conductances of potentially transpiring plants. Agricultural and ForestMeteorology, 43, 49-58.
26.
Jackson, R.D. (1982), Canopy temperature and crop water stress. In Advances in Irrigation (D. Hillel , Ed.), vol. 1, 43-85Academic Press . New York.
27.
Jurik, T.W. (1986), Seasonal patterns of leaf photosynthetic capacity in successional northern hardwood tree species. American Journal of Botany73(1), 131-136.
28.
Knipling, E.B. (1970), Physical and physiological basis for the reflectance of visible and near-infrared radiation from vegetation. Remote Sensing of Environment1, 155-159.
29.
Kozlowski, T.T. & Constantinidou, H.A. (1986), Responses of woody plants to environmental pollution. Forestry Abstracts, 47(2), 105-132.
30.
McBride, R.A., Gordon, A.M., & Groenevelt, P.H. (1989), Treatment of landfill leachate by spray irrigation: an overview of research results from Ontario, Canada. II. Soil quality for leachate disposal. Bulletin of Environmental Contamination and Toxicology, 42, 518-525.
Ontario Ministry of the Environment. (1988 ), Pers. CommPhytotoxicology Section-Air Resources Branch.
33.
Rock, B.N., Hoshizaki, T., & Miller, J.R. (1988), Comparison of in situ and airborne spectral measurements of the blue shift associated with forest decline. Remote Sensing Environment, 24, 109-127.
34.
Schwaller, M.R., Schnetzler, C.C., & Marshall, P.E. (1983), The changes in leaf reflectance of sugar maple seedlings in response to heavy metal stress. International Journal of Remote Sensing, 4(1), 93-100.
35.
Shibayama, M. & Akiyama, T. (1986), A spectroradiometer for field use VIII Radiometric estimation of nitrogen levels in field rice canopies. Japanese Journal of Crop Science, 55, 439-445.
36.
Singhroy, V., Stanton-Gray, R., & Springer, J. (1986), Spectral geobotanical investigation of mineralized till sites. In Proceedings of the Fifth Thematic Conference, Remote Sensing for Exploration Geology. Reno, Nevada.
37.
Walburg, G., Bauer, M.E., Daughtry, C.S.T., & Housley, T.L. (1982), Effects of nitrogen nutrition on the growth, yield and reflectance characteristics of corn canopies. Agronomy Journal, 74, 677-683.
38.
Wood, B.W. & Payne, J.A. (1986), Net photosynthesis of orchard grown pecan leaves reduced by insecticide sprays. Hortscience, 21(1), 112-113.
39.
Woolley, J.T. (1971), Reflectance and transmittance of light by leaves . Plant Physiology, 47, 656-662.
40.
Wuenscher, J.E. & Kozlowski, T.T. (1971), The response of transpiration resistance to leaf temperature as a dessication resistance mechanism in tree seedlings. Physiologia Plantarum24, 254-259.
41.
Zirschky, J., Abernathy, A.R., & Braswell, J. (1986), Land application of wastewater. Wat. Poll. Cont. J., 58(6), 532-534.
