Nitrogen Fixation in a Salt Marsh

Jones, Keith

doi:10.2307/2258998

Cited by 102 publications

(48 citation statements)

References 19 publications

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“…Algal mats collected from the field, which had been subjected to similar conditions (except that they were not in bottles), were able to resume acetylene reduction at the lower temperature. Therefore, in ecosystems where the temperature of the soil surface becomes hot, long-term exposures to acetylene such as those employed with temperate soils (Paul Myers and Rice, 1971;Jones, 1974) are not possible.…”

Section: Discussionmentioning

confidence: 99%

The Effects of Temperature on Acetylene Reduction by Mats of Blue‐green Algae in Sub‐tropical Grassland

Jones¹

1977

New Phytologist

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SUMMARYTemperature is the main factor governing the rate of acetylene reduction by mats of bluegreen algae in sub-tropical kilcuyu lawns. High midday temperatures (40°C at soil surface) inhibit acetylene reduction and low temperatures prior to dawn reduce the rate of nocturnal acetylene reduction. Data obtained from laboratory studies on algal mats and on Nostoc isolated from the mats are in agreement with those from in situ measurements confirming an acetylene reduction of 30-35°C with inhibition above 40°C.

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Section: Discussionmentioning

confidence: 99%

The Effects of Temperature on Acetylene Reduction by Mats of Blue‐green Algae in Sub‐tropical Grassland

Jones¹

1977

New Phytologist

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“…In the 1960's, N 2 fixing bacteria were first isolated from seawater (for example, Pshenen, 1963;see Capone, 1988 for a summary; also Carpenter, 1983a) and Japanese workers quantified densities of some heterotrophic diazotrophs (Maruyama and others, 1970). Using the 15 N 2 technique, many sites of shallow benthic N 2 fixation were also identified (Stewart, 1965;Jones, 1974;Capone, 1983;Howarth and others, 1988b), with the advent of the sensitive C 2 H 2 reduction method dramatically increasing the region over which benthic N 2 fixation was recognized (Capone, 1983).…”

Section: A Case Study: Excess Nitrate and Isotopes In The Mediterraneanmentioning

confidence: 99%

The conundrum of marine N2 fixation

Mahaffey¹

2005

American Journal of Science

240

231

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On a basin and global scale, iron (Fe) and P are thought to be primary chemical factors limiting N 2 fixation. The climatological and biological forcings, which individually or cumulatively promote diazotroph growth or trigger blooms, are still poorly understood. Improvements in coupled biological-physical and ecosystem models have allowed for the explicit representation of diazotrophs and, in particular, Trichodesmium and thus hold great potential for unraveling the factors that constrain diazotroph distribution and growth.The role of N 2 fixation in both the global N and C cycle, through both the inter-glacial and glacial cycles as well in the present day ocean, remains an open question. The emerging body of data on global rates of denitrification implies that the oceans are losing nitrate rapidly and, if true, either the rates of N 2 fixation are even higher than we currently estimate or, on some time-scale, the total stock of nitrate in the oceans is more variable than expected. Each of these outcomes has direct implications for the air-sea partitioning of CO 2 on climate time-scales. The question remains: does the importance of marine N 2 fixation relative to denitrification oscillate over various timescales in response to climate forcing or is the N cycle in a homeostatic steady state?

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“…STEWART (12) and JoNES (7) reported that the nitrogen fixed by cyanobacteria was transferred to higher plants, growing together for a short period. HIRANO (6) reported that the nitrogen in cyanobacteria was mostly incorporated into readily decomposable humus, which released ammonium to soils at a comparatively high rate.…”

mentioning

confidence: 99%

“…HIRANO (6) reported that the nitrogen in cyanobacteria was mostly incorporated into readily decomposable humus, which released ammonium to soils at a comparatively high rate. JoNES (7) • Present address: National Institute for Environmental Studies, Yatabe, Tsukuba, Ibaraki, 305 Japan.…”

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confidence: 99%