CAJ | 학술논문

研究了大亚湾大鹏澳海域鱼类养殖区、贝类养殖区以及核电站附近3个站位50～78 cm的柱状沉积物中生物硅(BSi)、总有机碳(TOC)、总氮(TN)等生源要素的垂直变化,以揭示人类活动对海洋环境影响的沉积记录.位于近岸海水养殖区的两个沉积柱中,近年来TOC含量呈明显上升趋势,而核电站附近海域略有下降.从TOC/TN比值判断(三个沉积柱平均分别为9.54、7.42、7.9),该海域TOC是陆源和水生两种来源的混合物.此外,养殖区上表层沉积物中水生有机碳(TOC_a)含量呈明显下降趋势,而TOC/TN比值则上升,说明养殖区水生初级生产力及其对总初级生产力的贡献下降;相反,陆源污染所造成的陆源有机碳(TOC_t)含量明显增加.在核电站附近海域,TOC_a含量明显上升,TOC/TN和TOC_t值下降,表明核电站的运行使水体初级生产力上升,陆源有机碳输入则减少.BSi、BSi/TOC_a的垂直分布表明,海水养殖区硅藻对总初级生产力的贡献逐年上升,而核电站海域硅藻的贡献则下降.
연구료대아만대붕오해역어류양식구、패류양식구이급핵전참부근3개참위50～78 cm적주상침적물중생물규(BSi)、총유궤탄(TOC)、총담(TN)등생원요소적수직변화,이게시인류활동대해양배경영향적침적기록.위우근안해수양식구적량개침적주중,근년래TOC함량정명현상승추세,이핵전참부근해역략유하강.종TOC/TN비치판단(삼개침적주평균분별위9.54、7.42、7.9),해해역TOC시륙원화수생량충래원적혼합물.차외,양식구상표층침적물중수생유궤탄(TOC_a)함량정명현하강추세,이TOC/TN비치칙상승,설명양식구수생초급생산력급기대총초급생산력적공헌하강;상반,륙원오염소조성적륙원유궤탄(TOC_t)함량명현증가.재핵전참부근해역,TOC_a함량명현상승,TOC/TN화TOC_t치하강,표명핵전참적운행사수체초급생산력상승,륙원유궤탄수입칙감소.BSi、BSi/TOC_a적수직분포표명,해수양식구규조대총초급생산력적공헌축년상승,이핵전참해역규조적공헌칙하강.
The vertical distributions of biogenic silica (BSi),total organic carbon (TOC),and total nitrogen (TN) were investigated in three sediment cores (50～78 cm) from Dapengao area of Daya Bay,the South China Sea.The sedimentary records of human activities in the marine environments were obtained.TOC concentrations were increased significantly in recent sediments in two cores from the cultural inshore areas,whereas were decreased near the Daya Bay Nuclear Power Plant (DBNPP).The organic matters in these three cores were mixtures of aquatic and terrestrial sources deduced from TOC/TN ratios (means 9.54,7.42,7.98 in three cores respectively).The significant decrease in aquatic organic carbon (TOC_a) and increase in TOC/TN ratios in two cultural areas showed the descending of aquatic primary production together with its contribution to total primary production.Oppositely,the terrestrial organic carbon (TOC_t) was increased obviously due to higher loading of terrestrial pollution.On the contrary,the increase in TOC_a and decrease in TOC/TN and TOC_t near DBNPP suggested the raise in aquatic primary production and the drop in terrestrial TOC inputs because of the operation of DBNPP.The vertical pattern of BSi and BSi/ TOC_a distribution showed that the contribution of diatoms to overall primary production enlarged in the cultural areas recently,but reduced near DBNPP.