Changes of the environmental parameters and their relationship in recent twenty years in the Bohai Sea
Changes of the environmental parameters and their relationship in recent twenty years in the Bohai Sea
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发表时间：
2000
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通讯作者：
Y. Zhi
中科院分区：
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作者：
Y. Zhi
回顾了渤海中部海域近20年来的营养盐和生物参数系列资料。结果表明，营养盐的浓度和相对含量都发生了很大的变化。氮的增加、磷酸盐和硅酸盐的减少导致了氮磷比的急剧增加和硅氮比的降低。渤海中部5、10月份平均N/P值由1982~1983年的1增加到1998~1999年的16 2，而Si/N值由1982~1983年的13 12下降到1998~1999年的1 32。渤海中部的氮限制状况正逐步向相对缺乏磷和硅酸盐的局面转变。黄河入渤海流量的减少可能是造成这一变化的原因。如果其他条件(如温度和水动力)合适，这些因素可能会限制硅藻的生长，从而促进甲藻的发育。这可能是渤海发生甲藻赤潮的主要原因。
The series data of nutrients and biological parameters in the central Bohai Sea for 20 years were reviewed. It is found that both concentration and relative content of nutrients were changed dramatically. The increase of nitrogen and decrease of phosphate and silicate led to the dramatically increase of N/P ratio and the decrease of Si/N ratio. The average ratio of N/P in May and October in the central Bohai Sea was increased from 1 64 in 1982～1983 to 16 2 in 1998～1999, but the average ratio of Si/N was decreased from 13 12 in 1982～1983 to 1 32 in 1998～1999. The situation of nitrogen limiting in the central Bohai Sea was gradually changing to that of relative lack of phosphate and silicate. The decrease of Yellow River flow into to Bohai Sea may be resulted in this change. These may limit the growth of diatom and thus promote the development of pyrrophyta if other conditions (e.g.temperature and hydrodynamics) were suitable. This may be the major factor for pyrrophyta red tide occued in Bohai Sea.