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- W17880132 abstract "Reported rates of nitrogen fixation in different salt marshes vary widely. Although some of this difference results from geographical considerations, there is inherent variability in the methods used for measurement of nitrogen fixation which may contribute significantly to the observed differences. This variability may be seen in two broad areas: experimental procedure (mainly sampling) and data analysis. In sampling, the effects of spatial heterogeneity are not always considered. In a Delaware marsh system, spatial effects are pronounced in all three dimensions in the marsh sediment. Normalized fixation rates increase as sample size decreases, presumably reflecting differences in gas diffusion. Therefore, extrapolations from small samples are unlikely to generate accurate quantitative results at the system (marsh) level. Concerning data analysis, it must be kept in mind that most field studies of nitrogen fixation predominantly involve the acetylene reduction technique. Different rates of acetylene reduction can be derived from many data sets collected in fixation studies, often varying by 5-to 10-fold. There is uncertainty surrounding the conversion of these rates to equivalent nitrogen fixation rates. Many conversion factors are used, varying by 10-fold. In spite of the difficulties in quantitative measurement, marsh nitrogen fixation has emerged as a significant process. It is possible to measure relative rates in small samples accurately. It follows that studies of the physiological ecology of marsh nitrogen fixation should prove informative and useful." @default.
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- W17880132 date "1980-01-01" @default.
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- W17880132 title "AN EVALUATION OF MARSH NITROGEN FIXATION" @default.
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- W17880132 doi "https://doi.org/10.1016/b978-0-12-404060-1.50019-8" @default.
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