近40年深圳大鹏湾海域赤潮发生规律及其演变机制分析

对我国典型赤潮高发区深圳大鹏湾海域自1980至2018年的赤潮发生记录进行统计和分析，并对1991－2018年间大鹏湾盐田附近海域氮、磷及可溶性硅的年际变化和月变化进行了分析。分析结果表明，大鹏湾海域赤潮次数分布、赤潮生物演变均与营养盐变化直接相关，2000年以后，氮、磷降低是赤潮减少的主要原因；大鹏湾海域春季赤潮频发也与该季节营养盐较高有关；且硅藻几乎从大鹏湾海域赤潮生物中消失，无机氮、磷酸盐及可溶性硅的降低是导致海域赤潮生物演变的主要原因，甲藻由于可以在营养限制的条件下采用各种应对机制，故而成为海域占主导地位的赤潮优势种。

Analysis on the occurrences and evolution mechanism of HABs in Dapeng bay,Shenzhen in the last 40 years

The data of HAB events in Dapeng bay of Shenzhen from 1980 to 2018 were collected, and the annual and monthly changes of TIN, phosphorus and dissolved silicon in the Yantian waters of Dapeng bay from 1991 to 2018 were analyzed. The results show that the temporal distribution of HABs and the succession of HAB causative organisms are directly related to the change of nutrients. After 2000, the decrease of nitrogen and phosphorus is the main reason for the decrease of HABs frequency; the spring HAB frequency in Dapeng bay is also related to the high nutrient levels in the season. Diatom blooms almost disappeared in Dapeng bay after 2000. The decrease of TIN, phosphorus and dissolved silicon is the main reason for the changes of HAB species composition in the area. Dinoflagellates can adopt various strategies to thrive under conditions of nutrient imbalance, which made it become the dominant HAB species in Dapeng bay.