Abstract
Nitrogen fixation (C2H2 reduction) by epiphylls on coffee,Coffea arabica, grown in sites with different degrees of shade, was determined. Coffee leaves with nitrogen-fixing epiphylls were found in all sites in approximately equal numbers. Rates of C2H2 reduction were similar for all sites and throughout the year, averaging 3.21 nmoles C2H2 reduced leaf with epiphylls−1 day−1. Apparently, neither rates of activity nor abundance of leaves with nitrogen-fixing epiphylls is related to the degree of shade in a site. No correlation was found between percent epiphyll cover and the presence or magnitude of nitrogen-fixing activity. Calculated annual fixation by epiphylls on coffee was low, ranging from 0.7 g N2 ha−1 year−1 for the shadeless site to 1.4 g N2 ha−1 year−1 for the site withIngajinicuil shade trees. These results suggest that epiphyll fixation is not an important source of nitrogen for the coffee ecosystem studied.
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Hardy, R. F. W., R. D. Holsten, E. K. Jackson, and R. C. Bums: The acetylene-ethylene assay for nitrogen fixation: laboratory and field evaluation. Plant Physiol.43, 1185–1207 (1968)
Jimenez, E.: Ecological study of the coffee agro-ecosystem: I. Structure of a coffee plantation in Coatepec, Ver., Mexico. Biotica4, 1–12 (1979)
Jimenez, E., and P. Martinez: Ecological studies of the coffee agro-ecosystem. II. Organic matter production in different types of coffee plantations. Biotica4, 109–126 (1979)
Jones, K.: Nitrogen fixation in the phyllosphere of Douglass fir,Pseudotsuga duglasii. Ann. Bot.34, 239–244 (1970)
Jones, K.: Nitrogen fixing bacteria in the canopy of conifers in a temperate forest. In C. H. Dickinson and T. F. Preece (eds.): Microbiology of Aerial Plant Structures, pp. 41–66. Academic Press, New York.
Jones, K., E. King, and M. Eastlick: Nitrogen fixation by free-living bacteria in the soil and in the canopy of Douglass fir. Ann. Bot.38, 765–772 (1974)
Last, F. T., and F. C. Deighton: The non-parasitic micro-flora on the surfaces of living leaves. Trans. Br. Mycol. Soc.48, 83–99 (1965)
McColl, J. G.: Properties of some natural waters in a tropical wet forest of Costa Rica. Bioscience20, 1096–1100 (1970)
Reynolds, A. G.: Stratification of tropical epiphylls. Kalilasan Philippine J. Biol.1, 7–10 (1972)
Ruinen, J.: The phyllosphere. I. An ecologically neglected milieu. Plant Soil15, 81–109 (1961)
Ruinen, J.: The phyllosphere. III. Nitrogen fixation in the phyllosphere. Plant Soil22, 375–394 (1965)
Ruinen, J.: Nitrogen fixation in the phyllosphere. In A. Quispel (ed.): The Biology of Nitrogen Fixation, pp. 86–121. North-Holland Publishing Co., Amsterdam (1974)
Sucoff, E.: Estimate of nitrogen fixation on leaf surfaces of forest species in Minnesota and Oregon. Can. J. Forest Res.9, 474–477 (1979)
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Roskoski, J.P. N2 Fixation (C2H2 reduction) by epiphylls on coffee,Coffea arabica . Microb Ecol 6, 349–355 (1980). https://doi.org/10.1007/BF02010497
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DOI: https://doi.org/10.1007/BF02010497