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依据从2012年11月至2013年11月,每月一次对胶州湾海域溶解无机营养盐的调查资料,分析了该海域营养盐的分布特征和季节变化。结果表明:NO_3-N是溶解无机氮(DIN)的主要存在形态,其次是NH_4-N,NO_2-N所占比例最低。从整体上来看,胶州湾溶解无机营养盐湾内浓度较高,湾外浓度较低,海域无机营养盐主要为陆源输入。湾内水体营养盐季节性变化明显,夏季7月水体中无机营养盐浓度较高,而冬末、春季无机营养盐浓度较低。湾口、湾外由于受陆源影响小,所以季节性变化不明显,且溶解无机营养盐浓度也偏低;但夏季7月各溶解无机营养盐浓度仍略高于其它月份。与上世纪90年代相比,NH_4-N和PO_4-P浓度明显降低,NO_3-N和Si O_3-Si的浓度增加两倍左右,NO_2-N浓度没有明显变化。
Based on the monthly survey of dissolved inorganic nutrients in the Jiaozhou Bay from November 2012 to November 2013, the distribution characteristics and seasonal variations of nutrients in this area were analyzed. The results showed that NO_3-N was the main form of dissolved inorganic nitrogen (DIN), followed by NH_4-N with the lowest proportion of NO_2-N. As a whole, the concentration of dissolved inorganic nutrient bay in Jiaozhou Bay is higher, while the concentration outside the bay is lower. Inorganic nutrients in the sea area are mainly imported from terrestrial sources. The nutrients in the bay have obvious seasonal changes. In summer, the concentration of inorganic nutrients in the water body is higher, while the concentration of inorganic nutrients in spring and winter is lower. Bayou, Bay outside due to the impact of terrestrial sources is small, seasonal changes are not obvious, and the concentration of dissolved inorganic nutrients is also low; but in summer July dissolved inorganic nutrient concentrations are still slightly higher than the other months. Compared with the 1990s, the concentration of NH 4 -N and PO 4 -P obviously decreased, the concentrations of NO 3 -N and Si O 3 -Si increased about two times, and NO 2 -N concentration did not change obviously.