南黄海近海富营养化长期演变的沉积记录  

SEDIMENTAL RECORDS OF EUTROPHICATION IN COASTAL WATERS OF THE SOUTHERN YELLOW SEA

作　　者：杨庶[1] 杨茜[1] 曲克明[1] 孙耀[1] 

机构地区：[1]中国水产科学研究院黄海水产研究所农业部海洋渔业可持续发展重点实验室,青岛266071

出　　处：《海洋与湖沼》2017年第1期22-28,共7页Oceanologia Et Limnologia Sinica

基　　金：国家自然科学基金联合基金;U1406403号;国家重点基础研究发展计划(973计划);2010CB428902号;2015CB453303号

摘　　要：限于现场调查起步晚、系统性不足,南黄海水体富营养化的历史演变进程目前尚不明确,严重制约了其形成机制及生态响应的深入研究。本文基于沉积物柱状样中保存的海洋环境演变信息,通过^(210)Pb构建沉积物的年代学框架,利用生物硅指示古初级生产力,探讨了近100年来南黄海近海的富营养化进程。结果显示:1980s以前,南黄海近海初级生产力总体偏低,其年代际波动与华北地区的干湿气候变化有关,水体未出现明显的富营养化;1980s以后,初级生产力的波动背离了气候变化的调控,大幅升高了约31%—254%,说明改革开放以后随着我国经济的快速发展,南黄海近海水体开始出现严重的富营养化。经分析得出,近年来大量含氮污染物的排放入海可能是导致该海域水体富营养化的主要原因。Frequent harmful algal blooms in coastal waters of China in recent years have been believed to be the result of eutrophication.However,in the southern Yellow Sea,the historical process of water eutrophication is not clear for lack of survey data.Focusing on this problem,we examined the clues of marine environmental changes preserved in sediment cores.With the use of 210 Pb and biogenic silica（BSi）,we estimated the age of sediment and rebuilt the change trend of paleo-productivity.The historical process of eutrophication in the past 100 a in coastal waters of the area is discussed.Results revealed obviously the variation in primary productivity in the past 100 a.Results show that before 1980 s,primary productivity was relatively low in the study area,and its decadal fluctuation was closely related to dry/wet climate changes in North China.However,after 1980 s,primary productivity increased significantly by 31%—254%,which obviously departed from the regulation of natural climate changes.This sudden increase clearly indicates that eutrophication has become serious,for which the massive emission of terrestrial nitrogenous contaminants to coastal waters is responsible,under the rapid development of Chinese economy.

关 键 词：南黄海 富营养化 沉积物柱状样 气候变化 人类活动 

分 类 号：P734[天文地球—海洋化学]