Distribution of urea section and its affecting factors in red-tide-frequent-occurrence area in spring
SU Ying1,2, JIANG Cong-cong1,2, SHI Xiao-yong1,2,3, ZHAO Yu-ting4, LIANG Sheng-kang1,2, WANG Xiu-lin1,2
1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;
2. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;
3. National Marine Hazard Mitigation Service, Beijing 100194, China;
4. Shandong Marine Resource and Environment Research Institute, Yantai 264006, China
Abstract：Based on the 7 times of ZA section surveys in Dong Sea from March 31 to May 27 in 2011, characterization of urea sectional distribution in this area and its affecting factors during the outbreak of Harmful Algal Blooms were analyzed. The results showed that the concentration of urea ranged from 0.06 to 3.27 μmol/L during outbreak of diatom bloom from March 31 to April 28, mainly influenced by Changjiang dilution water. It decreased a lot and remained 0.12~2.71 μmol/L when dinoflagellate red tide broke out in May, affected by metabolism of phytoplankton significantly. In the cruises, the high-value region of urea concentration presented characteristic of transferring far away from coastal area and then slowly closing the inshore. The whole urea contents showed a decreasing trend with the passing of time. The level of urea concentration during outbreak of dinoflagellate red tide was less than that when diatom red tide outbroke and its low area was corresponded with the high values of the concentration of chlorophyll, suggesting that the effective absorption and utilization of urea for dinoflagellate was one of the reasons to maintain a high incidence of dinoflagellate red tide in East China Sea.
SU Ying,JIANG Cong-cong,SHI Xiao-yong et al. Distribution of urea section and its affecting factors in red-tide-frequent-occurrence area in spring[J]. Marine Environmental Science, 2015, 34(2): 171-175.
SEITZINGER S P, SANDERS R W, STYLES R.Bioavailability of DON from natural and anthropogenic sources to estuarine plankton[J].Limnology and Oceanography, 2002, 47(2):353-366.
[10]
BERMAN T, BRONK D A.Dissolved organic nitrogen:A dynamic participant in aquatic ecosystems[J].Aquatic Microbial Ecology, 2003, 31(3):279-305.
[11]
KUDELA R M, COCHLAN W P.Nitrogen and carbon uptake kinetics and the influence of irradiance for a red tide bloom off southern California[J].Aquatic Microbial Ecology, 2000, 21(1):31-47.
[12]
KOKKINAKIS S A, WHEELER P A.Uptake of ammonium and urea in the northeast Pacific:comparison between netplankton and nanoplankton[J].Marine Ecology-Progress Series, 1998, 43:113-124.
[13]
COCHLAN W P, HERNDON J, KUDELA R M.Inorganic and organic nitrogen uptake by the toxigenic diatom Pseudo-nitzschia australis (Bacillariophyceae)[J].Harmful Algae, 2008, 8(1):111-118.
[14]
GLIBERT P M, TRICE T M, MICHAEL B, et al.Urea in the tributaries of the Chesapeake and Coastal Bays of Maryland[J].Water, Air, and Soil Pollution, 2005, 160(1/2/3/4):229-243.
GU G C, HU F X, HU H, et al.An analysis of high-concentration-salt water intrusion outside the Changjiang Estuary[J].Donghai Marine Science, 1994, 12(3):1-11.
CHEN C T A, WANG S L.Carbon, alkalinity and nutrient budgets on the East China Sea continental shelf[J].Journal of Geophysical Research:Oceans (1978-2012), 1999, 104(C9):20675-20686.
[27]
CHEN C T A.The Kuroshio intermediate water is the major source of nutrients on the East China Sea continental shelf[J].Oceanologica Acta, 1996, 19(5):523-527.
[an error occurred while processing this directive] | [an error occurred while processing this directive]
