Study on the Assimilation of Nitrogen and Phosphorus and on the Sorption of Heavy Metals in Laminaria hyperborea

Laminaria hyperborea is an economically and ecologically important kelp.It can grow lushly in the subtidal zone and from the seaweed forest,playing a significant ecological function.In this study,the absorption rates of nitrogen and phosphorus of L.hyperborea was determined at different temperatures(5°C,9°C,13°C,17°C),as well as relative growth rate(RGR)and accumulation of selected heavy metal ions(arsenic ions As5+,cadmium ions Cd2+,lead ions Pb2+),aiming to evaluate whether L.hyperborea is a potentially feasible candidate species for marine bioremediation.The main results are as follows:(1)the experimental specimens illustrated maximum absorption rates of nitrogen and phosphorus at 9°C~13°C after 72 h.The maximum absorption rates of phosphorus,ammonia nitrogen and nitrogen nitrate were 95%~98%,96%and 42%respectively,indicating that the removal of nitrogen nitrate,ammonia nitrogen,and phosphorus by L.hyperborea from seawater is significant.(2)The total arsenic ions content accumulated in the L.hyperborea was