The influence of macronitrogen (NO3- and NH4+) addition with Ulva pertusa on dissolved inorganic carbon system |
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| Authors: | ZHANG Naixing SONG Jinming CAO Conghu REN Rongzhu WU Fengcong ZHANG Shaoping and SUN Xu |
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| Institution: | 1.North China Sea Marine Forecasting Center, North China Sea Branch, State Oceanic Administration, Qingdao 266033, China2.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China3.Binzhou Technical College, Binzhou 256600, China |
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| 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 CO2
3? 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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| Keywords: | dissolved inorganic carbon algae simulated experiments Ulva pertusa macronitrogen the Jiaozhou Bay |
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