The influence of macronitrogen （NO3 and NH＋） addition with Ulva pertusa on dissolved inorganic carbon system in seawater was studied. The results indicate that p（C02） and HCO3 concentration decrease significantly...The influence of macronitrogen （NO3 and NH＋） addition with Ulva pertusa on dissolved inorganic carbon system in seawater was studied. The results indicate that p（C02） and HCO3 concentration decrease significantly, while pH and CO32- concentration increase significantly. When the con- centration of NO3 was less than 71 μmol/dm3 or NH4＋ was less than 49.7μmol/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 NH＋ after the experiment compared with DIC measured without nitrogen addition. A significant negative-correlation was found between Ac（DIC） and growth rate （#） of Ulva pertusa （r =- 0.91, P 〈0.000 1, n=11）. NH＋ had more influence on the species of inorganic carbon system than NO3.展开更多
基金The Key Laboratory of State Oceanic Administration for Marine Ecology and Environmental Science and Engineering,State Oceanic Administration under contract No.MESE-2008-07the Open Fund of North China Sea Branch,State Oceanic Administration under contract No.2010A01+1 种基金the Open Fund of State Oceanic Administration of China under contract No.2010503the Open Fund of Key Laboratory of Marine Ecology and Environmental Science,Institute of Oceanology,Chinese Academy of Sciences under contract No.KLMEES201003
文摘The influence of macronitrogen （NO3 and NH＋） addition with Ulva pertusa on dissolved inorganic carbon system in seawater was studied. The results indicate that p（C02） and HCO3 concentration decrease significantly, while pH and CO32- concentration increase significantly. When the con- centration of NO3 was less than 71 μmol/dm3 or NH4＋ was less than 49.7μmol/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 NH＋ after the experiment compared with DIC measured without nitrogen addition. A significant negative-correlation was found between Ac（DIC） and growth rate （#） of Ulva pertusa （r =- 0.91, P 〈0.000 1, n=11）. NH＋ had more influence on the species of inorganic carbon system than NO3.
