The Influence of Abiotic Factors on Biological Nitrogen Fixation in Different Types of Vegetation in the High Arctic, Svalbard

Zielke, Matthias; Ekker, Anne Stine; Olsen, Rolf A.; Spjelkavik, Sigmund; Solheim, Bjørn

doi:10.1080/15230430.2002.12003497

Cited by 65 publications

(97 citation statements)

References 18 publications

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“…Zielke et al (2002) reported N 2 fixation rates by moss-associated cyanobacteria in tundra mires that were similar to those reported in this study. Net and gross N mineralization determined at our Seida study site were in good agreement with other data from the scientific literature on N mineralization rate (Schmidt et al, 2002;Kaiser et al, 2005;Pare and Bedard-Haughn, 2012;Wild et al, 2013).…”

Section: Discussionsupporting

confidence: 79%

See 1 more Smart Citation

Variation in N₂Fixation in Subarctic Tundra in Relation to Landscape Position and Nitrogen Pools and Fluxes

Diáková

Biasi

Čapek

et al. 2016

Arctic, Antarctic, and Alpine Research

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Section: Discussionsupporting

confidence: 79%

“…Peat circles with dark bare surfaces could provide favorable thermal environments for diazotrophs. Higher temperatures and high light levels are likely to support biological crust formation (Liengen and Olsen, 1997;Zielke et al, 2002;Stewart et al, 2011b). Indeed, thin moss layers were found on PC with varying coverage.…”

Section: Introductionmentioning

confidence: 99%

Variation in N₂Fixation in Subarctic Tundra in Relation to Landscape Position and Nitrogen Pools and Fluxes

Diáková

Biasi

Čapek

et al. 2016

Arctic, Antarctic, and Alpine Research

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“…A great deal of variation in nitrogen fixation of cyanobacterial bryophytes has been attributed to abiotic factors; Zielke et al (2002) reported that in the High Arctic there is a strong dependency of fixation rates on site hydrology, temperature and light intensity. In regions with low precipitation during the growing season, for instance, N 2 fixation is limited either to the period of snowmelt or to sites which stay wet during summer, e.g.…”

Section: Introductionmentioning

confidence: 99%

Isotopic analysis of cyanobacterial nitrogen fixation associated with subarctic lichen and bryophyte species

et al. 2010

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Dinitrogen fixation by cyanobacteria is of particular importance for the nutrient economy of cold biomes, constituting the main pathway for new N supplies to tundra ecosystems. It is prevalent in cyanobacterial colonies on bryophytes and in obligate associations within cyanolichens. Recent studies, applying interspecific variation in plant functional traits to upscale species effects on ecosystems, have all but neglected cryptogams and their association with cyanobacteria. Here we looked for species-specific patterns that determine cryptogam-mediated rates of N 2 fixation in the Subarctic. We hypothesised a contrast in N 2 fixation rates (1) between the structurally and physiologically different lichens and bryophytes, and (2) within bryophytes based on their respective plant functional types. Throughout the survey we supplied 15 N-labelled N 2 gas to quantify fixation rates for monospecific moss, liverwort and lichen turfs. We sampled fifteen species in a design that captures spatial and temporal variations during the growing season in Abisko region, Sweden. We measured N 2 fixation potential of each turf in a common environment and in its field sampling site, in order to embrace both comparativeness and realism. Cyanolichens and bryophytes differed significantly in their cyanobacterial N 2 fixation capacity, which was not driven by microhabitat characteristics, but rather by morphology and physiology. Cyanolichens were much more prominent fixers than bryophytes per unit dry weight, but not per unit area due to their low specific thallus weight. Mosses did not exhibit consistent differences in N 2 fixation rates across species and functional types. Liverworts did not fix detectable amounts of N 2 . Despite the very high rates of N 2 fixation associated with cyanolichens, large cover of mosses per unit area at the landscape Plant Soil (2010) 333:507-517

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“…(Pandey et al, 2004) or Nostoc sp. (Zielke et al, 2002). An upper temperature limit cannot readily be derived from field observations because the present sea surface temperatures rarely reach the observed upper tolerance limit for Trichodesmium (Capone et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Physiological constraints on the global distribution of <i>Trichodesmium</i> – effect of temperature on diazotrophy

2007

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Abstract. The cyanobacterium Trichodesmium is an important link in the global nitrogen cycle due to its significant input of atmospheric nitrogen to the ocean. Attempts to incorporate Trichodesmium in ocean biogeochemical circulation models have, so far, relied on the observed correlation between temperature and Trichodesmium abundance. This correlation may result in part from a direct effect of temperature on Trichodesmium growth rates through the control of cellular biochemical processes, or indirectly through temperature influence on mixed layer depth, light and nutrient regimes. Here we present results indicating that the observed correlation of Trichodesmium with temperature in the field reflects primarily the direct physiological effects of temperature on diazotrophic growth of Trichodesmium. Trichodesmium IMS-101 (an isolate of T. erythraeum) could acclimate and grow at temperatures ranging from 20 to 34 • C. Maximum growth rates (µ max =0.25 day −1 ) and maximum nitrogen fixation rates (0.13 mmol N mol POC −1 h −1 ) were measured within 24 to 30 • C. Combining this empirical relationship with global warming scenarios derived from stateof-the-art climate models sets a physiological constraint on the future distribution of Trichodesmium that could significantly affect the future nitrogen input into oligotrophic waters by this diazotroph.

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The Influence of Abiotic Factors on Biological Nitrogen Fixation in Different Types of Vegetation in the High Arctic, Svalbard

Cited by 65 publications

References 18 publications

Variation in N₂Fixation in Subarctic Tundra in Relation to Landscape Position and Nitrogen Pools and Fluxes

Variation in N₂Fixation in Subarctic Tundra in Relation to Landscape Position and Nitrogen Pools and Fluxes

Isotopic analysis of cyanobacterial nitrogen fixation associated with subarctic lichen and bryophyte species

Physiological constraints on the global distribution of <i>Trichodesmium</i> – effect of temperature on diazotrophy

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The Influence of Abiotic Factors on Biological Nitrogen Fixation in Different Types of Vegetation in the High Arctic, Svalbard

Cited by 65 publications

References 18 publications

Variation in N2Fixation in Subarctic Tundra in Relation to Landscape Position and Nitrogen Pools and Fluxes

Variation in N2Fixation in Subarctic Tundra in Relation to Landscape Position and Nitrogen Pools and Fluxes

Isotopic analysis of cyanobacterial nitrogen fixation associated with subarctic lichen and bryophyte species

Physiological constraints on the global distribution of &lt;i&gt;Trichodesmium&lt;/i&gt; – effect of temperature on diazotrophy

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Variation in N₂Fixation in Subarctic Tundra in Relation to Landscape Position and Nitrogen Pools and Fluxes

Variation in N₂Fixation in Subarctic Tundra in Relation to Landscape Position and Nitrogen Pools and Fluxes

Physiological constraints on the global distribution of <i>Trichodesmium</i> – effect of temperature on diazotrophy