Reductions in photosynthetic carbon uptake in epiphytic diatoms by water-soluble extracts of leaves of Zostera marina

1985 ◽  
Vol 90 (1) ◽  
pp. 117-119 ◽  
Author(s):  
Paul G. Harrison ◽  
C. D. Durance
Keyword(s):  
Zostera Marina ◽  
Water Soluble ◽  
Carbon Uptake ◽  
Epiphytic Diatoms ◽  
Photosynthetic Carbon

scholarly journals Effects of nitrogen fertilization on the understorey carbon balance over the growing season in a boreal Pine forest

2013 ◽  
Vol 10 (8) ◽  
pp. 14093-14113
Author(s):  
D. B. Metcalfe ◽  
B. Eisele ◽  
N. J. Hasselquist
Keyword(s):  
Boreal Forests ◽  
Nitrogen Availability ◽  
Growing Season ◽  
Carbon Fluxes ◽  
Nitrogen Addition ◽  
Carbon Uptake ◽  
Sink Strength ◽  
Understorey Vegetation ◽  
Ecosystem Carbon ◽  
Photosynthetic Carbon

Abstract. Boreal forests play a key role in the global carbon cycle and are facing rapid shifts in nitrogen availability with poorly understood consequences for ecosystem function and global climate. We quantified the effects of nitrogen availability on carbon fluxes from a relatively understudied component of these forests – understorey vegetation – at three intervals over the summer growing period in a northern Swedish Scots Pine stand. Nitrogen addition altered both photosynthetic carbon uptake and respiratory release, but the magnitude and direction of this effect depended on the time during the growing season and the amount of nitrogen added. Specifically, nitrogen addition stimulated net ecosystem carbon uptake only in the late growing season. We find evidence for species-specific control of understorey carbon sink strength, as photosynthesis per unit ground area was positively correlated only with the abundance of the vascular plant Vaccinium myrtillus and no others. Comparison of photosynthetic carbon uptake with data on plant carbon dioxide release from the study site, indicate that understorey vegetation photosynthate was mainly supplying respiratory demands for much of the year. Only in the late season with nitrogen addition did understorey vegetation appear to experience a large surplus of carbon in excess of respiratory requirements. Further work, simultaneously comparing all major biomass and respiratory carbon fluxes in understorey and tree vegetation, is required to resolve the likely impacts of environmental changes on whole-ecosystem carbon sequestration in boreal forests.

Photosynthetic carbon uptake by marine phytoplankton: comparison of the stable (13C) and radioactive (14C) isotope methods

1995 ◽  
Vol 17 (7) ◽  
pp. 1449-1460 ◽  
Author(s):  
Laure Mousseau ◽  
Sophie Dauchez ◽  
Louis Legendre ◽  
Louis Fortier
Keyword(s):  
Marine Phytoplankton ◽  
Carbon Uptake ◽  
Photosynthetic Carbon

Photosynthetic carbon uptake induces autoflocculation of the marine microalga Nannochloropsis oculata

2017 ◽  
Vol 26 ◽  
pp. 302-311 ◽  
Author(s):  
Nhan-An T. Tran ◽  
Justin R. Seymour ◽  
Nachshon Siboni ◽  
Christian R. Evenhuis ◽  
Bojan Tamburic
Keyword(s):  
Nannochloropsis Oculata ◽  
Carbon Uptake ◽  
Marine Microalga ◽  
Photosynthetic Carbon

Chemical Factors Involved in the Control of Phytoplankton Production in the Experimental Lakes Area, Northwestern Ontario

1971 ◽  
Vol 28 (2) ◽  
pp. 203-213 ◽  
Author(s):  
Mitsuru Sakamoto
Keyword(s):  
Inorganic Carbon ◽  
Phytoplankton Production ◽  
Carbon Uptake ◽  
Short Term ◽  
Experimental Lakes Area ◽  
Northwestern Ontario ◽  
Photosynthetic Carbon ◽  
General Order ◽  
Chemical Factors

In short-term experiments (6 hr–3 days) the general order of decreasing importance of nutrients added individually to samples of lake water and contained phytoplankton was inorganic carbon, Fe, P, and N. The comparable order for long-term experiments (8–20 days) was P, Fe, N; or P, N, Fe. No relation was found between concentrations of chlorophyll and inorganic carbon in the lakes. The addition of iron and trace elements in chelated form and chelators (HEDTA, NTA) alone, increased photosynthetic carbon uptake. The deficiency of iron was mostly due to a lack of iron in a readily assimilable form.

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