英中_三种海藻对氮来源及其可获得性响应的初步研究.pdf

Journal of Ocean University of China (Oceanic and Coastal Sea Research) ISSN 1672-5182, April 30, 2004, Vol.3, No.l, pp.75-79 http: // www. ouc. edu. cn/xbywb/ E-mail: xbywb@mail, ouc. edu. cn Preliminary Study on the Responses of Thrcc Marine Algae, Ulva pertusa ( Chlorophyta ) , Gelidium amansii ( Rhodophyta ) and Sargassum enerve (Phaeophyta), to Nitrogen Source and Its Availability LIU Dongyan 1), Amy Pickering2), SUN J u n 3) 1) College of Marine Life Science, Ocean University of China, Qingdao 266003, P. R. China 2) Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14850, USA 3) Key Laboratory of Marine Ecology Environmental Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, P.R. China (Received February25, 2003; accepted March30, 2004) Abstract An experiment was designed to select economically valuable macroalga species with high nutrient uptake rates. Such species cultured on a large scale could be a potential solution to eutrophication. Three macroalgae species, Ulva pertusa (Chlorophyta), Gelidium amansii (Rhodophyta) and Sargassum enerve (Phaeophyta), were chosen for the experiment be- cause of their economic values and availability. Control and four nitrogen concentrations were achieved by adding NH2 and NO3- • The results indicate that the fresh weights of all species increase faster than that of control after 5 d culture. The fresh weight of Ulva pertusa increases fastest among the 3 species. However, different species show different responses to nitro- gen source and its availability. They also show the advantage of using NH4 than using NO3-. U. pe