Sources of dissolved organic carbon and nitrogen in Otsuchi Bay on the Sanriku ria coast of Japan in the spring
Sources of dissolved organic carbon and nitrogen in Otsuchi Bay on the Sanriku ria coast of Japan in the spring
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发表时间：
2007-06
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通讯作者：
H. Fukuda;H. Ogawa;R. Sohrin;A. Yamasaki;I. Koike
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作者：
H. Fukuda;H. Ogawa;R. Sohrin;A. Yamasaki;I. Koike
我们研究了溶解有机碳和氮（DOC和DON，分别），无机营养盐，浮游植物生物量（叶绿素a浓度），和细菌生物量在大槌湾，日本东北部的三陆里亚海岸，向东开放到太平洋的浓度的年际变化。DOC的变化与浮游植物生物量和溶解氧的变化相关（R� 0.427，n� 64，p� 0.05）和物理参数（盐度：R = 0.376，n = 65，p = 0.01;对数温度：R� 0.294，n� 65，p� 0.01），这表明，生物释放的DOC和通过河流径流和水体交换从湾外引入的DOC都有可能与海水交换，海岸水影响其在海湾中的动态。相反，DON浓度与Chl a相关，而与盐度和温度无关，表明DON的波动受湾外DON的影响较小。温度-盐度图表明，从Oyashio电流流入降低溶解有机物在海湾中的C：N摩尔比，而流入的河水和Tsugaru暖流提高C：N摩尔比。这些结果表明，在决定大槌湾溶解有机质的变化和化学组成方面，引入海湾的水团的来源和与湾外沃茨交换的频率同样重要。
We examined the interannual variation in the concentrations of dissolved organic carbon and nitrogen (DOC and DON, respectively), inorganic nutrients, phytoplankton biomass (concentration of chlorophyll a), and bacterial biomass in Otsuchi Bay, on the Sanriku ria coast of northeast Japan, opening to the east onto the Pacific Ocean. The variation in DOC was correlated with both phytoplankton biomass (R� 0.427, n� 64, p� 0.05) and physical parameters (salinity: R�� 0.376, n� 65, p� 0.01; log-temperature: R� 0.294, n� 65, p� 0.01), suggesting that both DOC released from organisms and DOC introduced from outside of the bay by river runoff and water exchange with off-shore water affect its dynamics in the bay. In contrast, DON concentrations were correlated with Chl a but not with salinity or temperature, suggesting that the fluctuation of DON is less af- fected by the introduction of DON from outside of the bay. A temperature-salinity diagram suggested that inflow from the Oy- ashio Current lowers the C : N molar ratio of dissolved organic matter in the bay, whereas inflow of riverine water and the Tsug- aru Warm Current raise the C : N molar ratio. These results suggest that the origin of water mass introducing to the bay is as im- portant as the frequency of water exchange with waters from outside of the bay in determining the variation and chemical com- position of dissolved organic matter in Otsuchi Bay.