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Aeration, nitrogen and salinity as determinants of Spartina alterniflora Loisel. Growth response

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Abstract

A greenhouse experiment was conducted to examine the effects of salinity, nitrogen, and aeration on the growth of Spartina alterniflora Loisel. The experiment was conducted in a factorial arrangement of treatments with salt marsh substrate at three salinity levels (15, 30, 45‰), at two nitrogen levels (0 and 168 kg/ha) and at two aeration levels (zero and oxygen saturation).

The maximum biomass was found in the low salinity, nitrogen enhanced, aerated treatment which had 11 times more biomass than the highest (45‰) salinity, nitrogen poor, unaerated treatment. the average effect of nitrogen over the three salinity levels was a 2.01, 1.47, 1.25, and 1.52 times increase in aerial biomass, density, height, and belowground biomass of the plants, respectively. The main effect of aeration was a 2.49, 2.01, 1.57, and 1.85 times increase in the same variables. The combination effect of aeration and nitrogen additions enhanced biomass by 453%. An increase in salinity from 15‰ to 45‰ decreased biomass, density, height and belowground biomass of S. alterniflora by 66, 53, 38, and 61%, respectively. The effect of salinity was more pronounced between 30 and 45‰ than it was between 15 and 30‰.

N, P, K, Ca, Mg, Na, Fe, Mn, Zn, Cu, and S concentrations in the aerial living biomass were also examined. There was no evidence to suggest that elemental concentrations (on a per gram basis) were consistently correlated with increased or decreased growth. In relation to salinity, correlations between growth and elemental concentrations were negative while for nitrogen enhanced and/or aerated systems, the correlations were positive.

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Authors and Affiliations

  1. Department of Botany, North Carolina State University, 27650, Raleigh, North Carolina

    Rick A. Linthurst & Ernest D. Seneca

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  1. Rick A. Linthurst
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  2. Ernest D. Seneca
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Paper number 6093 of the Journal of the North Carolina Agricultural Research Service, Raleigh, North Carolina 27650. Mention of a trade name does not constitute a guarantee or warranty of the product by the North Carolina. Agricultural Research Service, and does not imply its approval to the exclusion of other products that may also be suitable.

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Linthurst, R.A., Seneca, E.D. Aeration, nitrogen and salinity as determinants of Spartina alterniflora Loisel. Growth response. Estuaries 4, 53–63 (1981). https://doi.org/10.2307/1351542

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