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The influence of macronitrogen (NO - 3 and NH + 4 ) addition with Ulva pertusa on dissolved inorganic carbon system in seawater was studied. The results indicate that p(CO 2 ) and HCO 3 concentration decrease significantly, while pH and CO 2- 3 concentration increase significantly. When the concentration of NO 3 was less than 71 μmol/dm 3 or NH + 4 was less than 49.7 μmol/dm 3 , dissolved inorganic carbon (DIC) absorption rates by Ulva pertusa generally increased with the increasing of nitrogen concentration. The DIC decreased 151 μmol/dm 3 with the addition of 71 μmol/dm 3 NO 3 and decreased 232 μmol/dm 3 with the addition of 49.7 μmol/dm 3 NH + 4 after the experiment compared with DIC measured without nitrogen addition. A significant negative-correlation was found between c(DIC) and growth rate (μ) of Ulva pertusa (r = -0.91, P <0.000 1, n=11). NH + 4 had more influence on the species of inorganic carbon system than NO 3 .
The influence of macronitrogen (NO - 3 and NH + 4) addition with Ulva pertusa on dissolved inorganic carbon system in seawater was studied. The results indicate that p (CO 2) and HCO 3 concentration decrease significantly, while pH and CO 2- 3 When the concentration of NO 3 was less than 71 μmol / dm 3 or NH + 4 was less than 49.7 μmol / dm 3, dissolved inorganic carbon (DIC) absorption rates by Ulva pertusa generally increased with the increasing of nitrogen concentration . The DIC decreased 151 μmol / dm 3 with the addition of 71 μmol / dm 3 NO 3 and decreased 232 μmol / dm 3 with the addition of 49.7 μmol / dm 3 NH + 4 after the experiment compared with DIC measured without nitrogen addition. A significant negative-correlation was found between c (DIC) and growth rate (μ) of Ulva pertusa (r = -0.91, P <0.000 1, n = 11) than NO 3.