大亚湾扁脑珊瑚中重金属的年际变化及其海洋环境指示意义  

ANNUAL CHANGES OF HEAVY METALS IN CORAL PLATYGYRA IN DAYA BAY AND THEIR MARINE ENVIRONMENT IMPLICATION

作　　者：余克服[1] 陈特固[1] 练健生[1] 王肇鼎[1] 刘东生[2] 

机构地区：[1]中国科学院南海海洋研究所,广州510301 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《第四纪研究》2002年第3期230-235,共6页Quaternary Sciences

基　　金：国家自然科学基金 (批准号 :4 990 2 0 1 4 );广东省自然科学基金 (批准号 :2 0 0 1 1 2 80 );中国科学院大亚湾海洋生物综合实验站基金 (批准号 :P990 9)

摘　　要：通过对南海北部大亚湾海区 1 976～ 1 998年扁脑珊瑚Platygyra骨骼Cu ,Pb和Cd含量的研究及其与观测记录的比较 ,初步认为珊瑚可以记录大亚湾海区重金属的年际变化特征 ;发现 1 979年和 1 991年是重金属含量比较高的年份 ;由扁脑珊瑚记录推测珊瑚中Cd含量短时间内可能受到了核电站兴建的影响 ,但近 2 0多年来的大亚湾扁脑珊瑚及海水中重金属状况的总体变化过程可能与整个广东海域水质的变化背景基本一致 。Reef corals have proved to be good records of the past hundreds to thousands of years of envi ronmental history in tropical oceans. In China,some advances have been made on the calibration of coral skeleton δ 18 O,Mg/Ca,Sr/Ca,U/Ca and SST,of coral skeleton δ 13 C and sunshine duration,rain fall and cloud cover,in the past environment reconstruction,and in the climate event analysis,such as El Nio. But almost no study has been made on the heavy metal variations recorded in corals in the mainland of China,though many publications from international and Taiwan of China have made great contribution in this field. Daya Bay,located in the northern coast of the South China Sea,is the largest gulf aquatic products reserve of Guangdong Province. Many reef corals grow in the waters. The first nuclear power station of China,located in the southwest coast of the bay,came to build in 1986 and to run in 1994. So it′s an ideal site not only for studying heavy metal variations over past decades,but also for monitoring the influence of the nuclear power station on the waters. A coral sample Platygyra with about 20 years growth history was collected at 1.5m water depth and about 1.5km away from the thermal effluent outlet of the nuclear power station of Daya Bay in the October of 1998. After collection,it was soaked and washed with freshwater in order to eliminate the remaining portion of coral tissue or endolithic algae and salt. Then a 1cm thick slab was cut with a high speed diamond saw in the direction of the axis of major growth. Dry coral slabs were X radiographed in order to reveal the skeletal density banding pattern and determine the annual growth rates. Using the X ray negatives as a location guide,the sub annual samples were sliced or scraped with a very thin razor blade by hand with continued sampling resolution of 0.8 cm. A total of 38 samples were taken for cupper (Cu),lead (Pb) and cadmium (Cd) analysis. Each subannual sample was about 0.1～0.3g. The Cu,Pb and Cd were determined

关 键 词：大亚湾 扁脑珊瑚 海洋环境 重金属 污染 核电站 南海 

分 类 号：X55[环境科学与工程—环境工程]