References
- DÖBereiner, J., Urquiaga, S. & Boddey, R. M., 1995: Alternatives for nitrogen nutrition of crops in tropical agriculture. — Fert. Res. 42: 339–346.
- Doyle, R. D. & Fisher, T. R., 1994: Nitrogen fixation by periphyton and plankton on the Amazon floodplain at Lake Calado. — Biogeochemistry 26: 41–66.
- Hamilton, S. K., Lewis, W. M. & Sippel, S. J., 1992: Energy sources for aquatic animals in the Orinoco River floodplain: evidence from stable isotopes. — Oecologia 89: 324–330.
- Junk, W. J., 1997: The Central Amazon Floodplain: Ecology of a Pulsing System. — Ecological Studies, Vol. 126. — Springer Verlag, Berlin. 525 pp.
- Kern, J., & Darwich, A., 1997: Nitrogen turnover in the várzea. — In: Junk, W. J. (ed.): The Central Amazon floodplain: Ecology of a pulsing system. — Ecological Studies, Vol. 126: 119–135. — Springer-Verlag, Heidelberg.
- Martinelli, L. A., Victoria, R. L., Trivelin, P. C. O., Devol, A. H. & Richey, J. E., 1992: 15N Natural abundance in plants of the Amazon River floodplain and potential atmospheric N2 fixation. — Oecologia 90: 591–596.
- Salati, E., Sylvester-Bradley, R., & Victoria, R.L., 1982: Regional gains and losses of nitrogen in the Amazon basin. — Plant Soil 67: 367–376.
- Sanginga, N., Bowen, G. & Danso, S. K. A., 1990: Assessment of genetic variability for N2 fixation between and within provenances of Leucaena leucocephala and Acacia albida estimated by l5N labelling techniques. — Plant Soil 127: 169–178.
- Shearer, G., & Kohl, D. H., 1988: Natural l5N abundance as a method of estimation the contribution of biologically fixed nitrogen to N2-fixing systems: potential for non-legumes. — Plant Soil 110: 317–327.
- Sprent, J. I., Geoghegan, I.E., Whitty, P. W. & James, E. K., 1996: Natural abundance of N-15 and C-13 in nodulated legumes and other plants in the cerrado and neighbouring regions of Brazil. — Oecologia 105: 440–446.
- Worbes, M., 1997: The forest ecosystems of the floodplains. — In: JUNK, W. J. (ed.): The Central Amazon floodplain: Ecology of a pulsing system. — Ecological Studies, Vol. 126: 223–265. — Springer-Verlag, Heidelberg.