连环湖他拉红泡重金属和营养元素的沉积记录  

Sedimentary Record of Heavy Metals and Nutrient Elements in Core Sediments from Talahong Sub-lake in the Lianhuan Lake

作　　者：孙丽[1] 臧淑英[1] 肖海丰[1] 孙华杰[1] 

机构地区：[1]哈尔滨师范大学,黑龙江省高校地理环境遥感监测重点实验室,黑龙江哈尔滨150025

出　　处：《地理与地理信息科学》2010年第4期99-103,共5页Geography and Geo-Information Science

基　　金：国家自然科学基金项目(40771195、40972115);黑龙江省杰出青年基金项目(JC200714)

摘　　要：通过对连环湖他拉红泡柱状沉积岩芯TE中重金属元素、有机质（OM）、总氮（TN）、C/N及总磷（TP）等多指标综合分析,研究了重金属与营养元素的含量变化特征及可能的影响因素,并采用聚类分析方法判别重金属元素的可能污染来源。结果表明,岩芯深部18.5~12.5 cm,大部分元素含量波动幅度较小,C/N值在20左右波动,较稳定,元素属自然状态下的沉积;岩芯中部12.5~5.5 cm,Li、Mn、Ni、Fe、Zn、OM和TP含量呈现减小趋势,经参考元素校正后初步证实受干旱气候的影响,C/N值波动较大,均值高于第一阶段,Mn、Ni和Cu经校正后含量基本未发生变化,仍为自然状态下的沉积,而Fe、Pb、Cr和Zn校正后含量呈增大趋势,推测受到人类活动污染排放的影响;岩芯上部5.5~1.5 cm,重金属和营养元素含量均缓慢增加,C/N值有所减小,重金属元素含量高值接近自然沉积时的含量值,表明重金属污染程度较轻,尚未对湖泊水体及生物达到毒害作用,而营养元素含量高值远大于自然沉积时的含量值,说明湖泊富营养化程度明显加重,已对水体及生物构成危害,应作为治理水污染工作的重点。Heavy metals,OM,TN,C/N and TP were investigated from the TE core sediments of Talahong sub-lake in Lianhuan Lake,which represented the concentration history of heavy metals and nutrient elements,and the possible influencing factors were analyzed.Furthermore,cluster analysis was applied to find out the possible sources of heavy metals.The results indicated that all elements were from natural sources,the concentrations of most elements fluctuated lightly at 18.5~12.5 cm,and the C/N fluctuated at about 20;at the middle of the core（12.5~5.5 cm）,the concentrations of Li,Mn,Ni,Fe,Zn,OM and TP decreased,that maybe be controlled by the dry climate,and the C/N was higher than the deeper of the core.The after particle-normalized concentrations of Mn,Ni and Cu did not change on the whole,and that indicated these elements were still from natural sources.The concentrations of Fe,Pb,Cr and Zn increased,that maybe be impacted by the pollution emissions of human activities.The concentrations of heavy metals and nutrient elements increased,and the C/N decreased at 5.5~1.5 cm.The maximum contents of heavy metal elements were closed to the content of natural sources,which indicated heavy metal pollution was on the low level.While the maximum contents of nutrient elements were extremely higher than the content of natural sources,which indicated the eutrophication aggravated obviously,and there already existed ecological toxic risk to aquicolous animals.Therefore the control of polluted water work should be focused on.

关 键 词：重金属 营养元素 沉积物 连环湖 

分 类 号：P512.2[天文地球—地质学]