Seasonal changes of concentrations of inorganic and organic nitrogen in coastal marine sediments |
| |
| Institution: | 1. Water Pollution Division, Tokai Regional Fisheries Research Laboratory, the Ministry of Agriculture, Forestry and Fisheries Arasaki, Nagai, Yokosuka 238-03, Japan;2. Laboratory of Narine Biochemistry, Faculty of Applied Biological Science, Hiroshima University Midori-machi, Fukuyama 720, Japan;3. Okayama Prefectural Fisheries Research Station, the Okayama Perfectural Government Ushimado-cho, Okayama, 701-43, Japan;1. Organic Opto-Electronic Materials Laboratory, Department of Chemical and Biomolecular Engineering (BK-21 plus), Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;2. Graduate School of EEWS and Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;1. São Paulo State University – Unesp, Department of Cartography, Presidente Prudente 19060-900, Brazil;2. São Paulo State University – Unesp, Department of Environmental Engineering, São José dos Campos 12247-004, Brazil;1. Key Laboratory of Physical Oceanography (Ocean University of China), Ministry of Education, Qingdao 266100, China;2. Institute of Physical Oceanography, Ocean College, Zhejiang University, Zhoushan 316021, China;3. State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Hangzhou 310012, China;4. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China |
| |
| Abstract: | The seasonal fluctuations of the concentration of nitrogenous compounds in sediments was investigated for three regions of the Seto Inland Sea in Japan; the variation of nitrogenous compounds in sediments was also studied in a laboratory experiment.The amounts of ammonium, dissolved organic nitrogen, nitrite and nitrate, as percentages of the dissolved total nitrogen of the interstitial water, were in the ranges of 47–99%, 10–50%, 0·1–0·6% and 0·3–4·1%, respectively. Ammonium was the major component and organic nitrogen was the next most important. The concentrations of these nitrogenous compounds changed seasonally: dissolved total nitrogen was higher in the warm month of September than in May; ammonium increased in warm months and decreased in cold months, but nitrite and nitrate increased in cold months. It was possible to explain the seasonal fluctuation of nitrogenous compounds in terms of the rates of the metabolic pathways of nitrogen in the sediments.Ammonium was not necessarily correlated with dissolved organic nitrogen. From this, it was considered that ammonium did not occur from solubilization of particulate organic nitrogen followed by mineralization, but from direct mineralization of particulate organic nitrogen in sediments.For the sediments of Suho Nada, Hiuchi Nada and station B-47 in Beppu Bay, the ratio of dissolved ammonium to adsorbed ammonium in the sediments was in the range 10–25%, but the ratio was 60–70% of adsorbed ammonium in the considerably anaerobic sediments at station B-45 in Beppu Bay. The ratio of dissolved ammonium to adsorbed ammonium increased with the increase of the concentration of sulfide in sediments. It was recognized that the anaerobic conditions of the sediments led to the dissolution of adsorbed ammonium. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
