Abstract
The influence of macronitrogen (NO3− and NH4+) addition with Ulva pertusa on dissolved inorganic carbon system in seawater was studied. The results indicate that p(CO2) and HCO3− concentration decrease significantly, while pH and CO23− concentration increase significantly. When the concentration of NO3− was less than 71 µmol/dm3 or NH4+ was less than 49.7 µmol/dm3, dissolved inorganic carbon (DIC) absorption rates by Ulva pertusa generally increased with the increasing of nitrogen concentration. The DIC decreased 151 µmol/dm3 with the addition of 71 µmol/dm3 NO3− and decreased 232 µmol/dm3 with the addition of 49.7 µmol/dm3 NH4+ after the experiment compared with DIC measured without nitrogen addition. A significant negative-correlation was found between Δc(DIC) and growth rate (µ) of Ulva pertusa (r = −0.91, P <0.000 1, n=11). NH4+ had more influence on the species of inorganic carbon system than NO3−.
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