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Nitrogen Cycle in Fresh Water Lakes
NitrogenFixation in Lake Mendota
NitrogenFixation in Lake Wingra
3 other sections not shown
abundance accumulation aeration Ainr ammonia and nitrate ammonia-nitrogen amounts of nitrate Anabaena assimilation atom per cent biological blue-green algae CN CN CN combined nitrogen concentrations of ammonia concentrations of nitrate Dark Experiment day~l decomposition denitrification determined distribution of nitrogen Dugdale epilimnion experimental tank maintained fixed nitrogen forms of nitrogen fractionation free nitrogen given in Table glucose Hoering hypolimnion increase Incubation in experimental investigations isotope effect isotopes of nitrogen Juday Kjeldahl nitrogen l.0 meter Lake Mendota lake water Lake Waubesa Lake Wingra late winter layer low concentrations mass spectrometer maximum measured molecular nitrogen natural waters Neess nitrate and ammonia nitrate reduction nitrate-nitrogen nitro nitrogen compounds nitrogen cycle nitrogen fixation nitrogen isotope ratios nitrogen-fixation in Lake Nostoc muscorum organic nitrogen oxidation of ammonia oxygen percentage fixation rates phytoplankton plankton Protein rate of fixation Rates in Lake Rittenberg sal ammoniac suggest summer stratification surface water tank nitrogen temperature trophogenic zone