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- W2005202380 abstract "A temperature controlled chamber for the in situ measurement of nitrogen fixation (acetylene reduction) in a vegetated salt marsh is described. Rates of acetylene reduction activity (ARA) were linear during a 9 h incubation. Measurements of acetylene penetration into the sediment indicate that the chamber technique measures ARA within the top 2–4 cm of the sediment column. This depth of penetration accounted for approx. 60% of the total ARA in the sediment column. Measurements of in situ ARA in three zones of a vegetated salt marsh (tall, medium and short height Spartina alterniflora) over a year were positively correlated with seasonal temperature variations. About 70–80% of the seasonal variation in ARA was explained by the Arrhenius relationship: ARA (μmol C2H4m−2h−1)=α exp(−β/fT); where T is the ambient air temperature (°C) and α and β are constants. The constant α in this model increased from 20.1 to 40.5 while β increased from 17.5 to 20.7 along a transect from the tall to short height-form S. alterniflora communities. These differences suggest that there is spatial variability within the salt marsh among the variables that affect nitrogen fixation." @default.
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- W2005202380 date "1986-01-01" @default.
- W2005202380 modified "2023-10-16" @default.
- W2005202380 title "Nitrogen fixation (C2H2 reduction) in a salt marsh: Its relationship to temperature and an evaluation of an in situ chamber technique" @default.
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- W2005202380 doi "https://doi.org/10.1016/0038-0717(86)90009-x" @default.
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