有明海奥部底質における吸着態NH4+の季節変化とその影響因子
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概要
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The seasonal variation of sediment adsorption of NH4+ in the inner area of the Ariake Bay was investigated during June, 2010-May, 2011. The adsorbed NH4+-N concentration between sampling sites was closely related to the mud content in sediments. The amounts of NH4+-N adsorbed onto the sediment particles were found to account for approximately 80 ? 90% of the total amounts of NH4+-N (dissolved + adsorbed NH4+-N) in sediments throughout the year. The sediment environmental factors that affect the adsorption coefficient (K*) were determined using a stepwise multiple regression analysis. As a result, we found that redox potential at St1 (muddy sediment) and mud content at St2 (sand-muddy sediment) had an important effect on K*, respectively.
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