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Discussion of the effects of N with and without acidified S on a sitka spruce ecosystem after 5 years treatment
2002
Sheppard, L.J. | (CEH Edinburgh Bush Estate, Edinburgh (United Kingdom)) | Crossley, A. | Ingleby, K. | Carfrae, J. | Harvey, F. | Kennedy, V.
Significant differences in the effects of N alone compared with NS Acid have been found with respect to eutrophication and acidification. N alone had no effect on the pleurocarpous mosses, whereas NS Acid caused their death within 2 years. Both treatments enhanced stem area increment and N alone also doubled fine root growth. By contrast NS Acid treatments increased litterfall in a a dose response fashion
Show more [+] Less [-]Forest health research on a natural air pollution gradient in the San Bernardino Mountains, Southern California
2002
Arbaugh, M.J. | Alonso, R. | Bytnerowicz, A. (USDA Forest Service, Riverside (USA). Pacific Southwest Research Station)
Toxic effects of photochemical smog on ponderosa and Jeffrey pines in the San Bernardino Mountains were discovered in the 1950s. It was revealed that ozone is the main cause of foliar injury manifested as chlorotic mottle and premature needle senescence. Various morphological, physiological and biochemical alterations in the affected plants have been reported over a period of about 40 years of multidisciplinary research. Recently, the focus of research has shifted from studying the effects of ozone to multiple pollutant effects. Recent studies have indicated that the combination of ozone and nitrogen may alter biomass allocation in pines towards that of deciduous trees, accelerate litter accumulation and increase carbon sequestration rates in heavily polluted forests
Show more [+] Less [-]Ponderosa pine response to elevated CO2 and nitrogen
2002
Johnson, D.W. (University of Nevada, Reno (USA). Environmental and Resource Sciences) | Ball, J.T. | Hoylman, A.M. | Walker, R.F.
This paper summarizes the data on growth response and N uptake in open-top chambers planted with ponderosa pine (Pinus ponderosa Laws.) treated with both N (0, 10, and 20 g N msub-2 yrsub-1 as ammonium sulfate ) and CO2. Both N and elevated CO2 caused increased growth. The effects of N on growth response to elevated CO2 were assessed in various ways and various interpretations could be drawn depending on which metric was used, including a negative effect of N on growth response to CO2. These calculations suggest that expressing growth as percentages can be misleading, especially when done on a grams per tree basis
Show more [+] Less [-]Nitrate evolution in groundwater in the Buenos Aires province (Argentina)
1993
Mugni, J. | Kruse, E. (IDESA INGENIERIA S.A. (Argentina))
Water quality of drainage from industrial waste landfills and its effects on paddy rice
1993
Misawa, S.I. | Toyota, M. | Zulu, G. | Kondoh, T. (Faculty of Agriculture, Niigata University, Niigata City (Japan))
Nitrogen leaching assessment under intensive agricultural practice
1993
Guimera, J. | Candela, L. (School of Civil Engineering, Polytechnic University of Catalonia, Barcelona (Spain))
Nitrate leaching and strawberry production as affected by drip irrigation
1993
Serrano, L. | Carbonell, X. | Marfa, O. | Candela, L. | Guimera, J. (Institut de Recerca i Technologia Agroalimentaries, Centre de Cabrils, Barcelona (Spain))
Research on and development of methods for the reduction of soil and water contamination by nitrates and ammonium
1993
Filipan, R. | Benc, S. | Cerjan-Stefanovic, S. | Butorac, A. (Institute for Development and International Relations, Zagreb (Croatia))
Common treatment of sewage sludge and animal waste slurries in covered digesters
1992
Linke, B. | Kolisch, G. (Essen Univ. (Germany). Inst. fuer Umwelttechnik)
Determination of critical loads of atmospheric pollutants in natural ecosystems, particularly forests. Basic principles. The Vosges project (France)
1993
Dambrine, E. (Institut National de la Recherche Agronomique, Champenoux (France). Centre de Nancy, Microbiologie Biogeochimie et Pathologie des Ecosystemes Forestiers) | Probst, A. | Party, J.P.
