欢迎来到天天文库
浏览记录
ID:57750323
大小:1.88 MB
页数:9页
时间:2020-03-28
《潮滩围垦对沉积物重金属的影响初探——以江苏为例.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第36卷第1期2017年2月海洋通报~【ARINESCmNCEBULLETINV01.36.No.1Feb.2017Doi:10.11840,j.issn.1001—6392.2017.01.011潮滩围垦对沉积物重金属的影响初探以江苏为例杨磊1,一,李明亮,一,金洋·,龚绪龙1一,汪亚平3,高建华3(1.江苏省地质调查研究院,江苏南京210018;2.国土资源部地裂缝地质灾害重点实验室,江苏南京210018;3.南京大学地理与海洋科学学院,江苏南京210023)摘要:根据围垦前后的江苏条子泥潮滩沉积物重金属数据,获取重金
2、属背景值,分析重金属含量与分布的变化特征,探讨围垦对重金属的影响机制,运用潜在生态风险指数法评价重金属生态风险变化。结果表明,重金属cr、Ni、Pb的平均含量降低7.2%~15.2%,Cu、Zn、As、Cd的平均含量升高2.7%~23.6%,重金属空间分布的异质性增强;围垦改变堤外潮滩水动力与沉积物分布格局,离岸越远,重金属含量的变化越不明显;受植被类型、土地利用方式的影响,互花米草滩重金属含量变化率明显高于盐蒿滩,用作水产养殖的潮滩重金属含量普遍降低,用作农业种植的潮滩重金属含量普遍升高;潮滩沉积物总体质量优良,重金属总
3、潜在生态风险指数平均值和最大值分别升高6.5%和23.8%,仍处于低生态风险程度。关键词:围垦;潮滩;沉积物;重金属;影响机制;生态风险;江苏中图分类号:P736.2文献标识码:A文章编号:1001—6932(2017)Ol一0082—09Effectsoflargescaletidalfiatreclamationonheavymetalsinsediments:acasestudyonJiangsuProvince,ChinaYANGLeil”,LIMing-lian91”,JINYan91,GONGXu-lon91”
4、,WANGYa-pin93,GAOJian—hua3(1.GeologicalSurveyofJiangsuProvince,Nanjin9210018,China;2.KeyLaboratoryofEarthFissuresGeologicalDisaster,MinistryofLandandResources,Nanjin9210018,China;3.SchoolofGeographicandOceanicSciences,NanjingUniversity,Nanjing210023,China)Abstract
5、:AccordingtothedataofheavymetalsinsedimentsfromtidalflatatTiaoziniareainJiangsuProvincebeforeandafterthereclamation,backgroundvaluesofheavymetalswereobtained,thevariationcharacteristicsandtheeffectmechanismofheavymetalresponsetothereclamationwereinvestigated.Theec
6、ologicalriskvariationofheavymetalswasevaluatedbyusingpotentialecologicalriskindex.TheresultsshowedthattheaveragecontentsofCr,Ni,Pbweredecreasedby7.2%to15.2%,andthoseofCu,Zn,As,Cdwereincreasedby2.7%to23.6%.Thedistributionheterogeneityofheavymetalswasincreased.Theco
7、ntentvariationofheavymetalswasmoreinsignificantattheplacefartherfromthecoastowingtothechangesofhydrodynamicsandsedimentdistributionpatternsoutsidethedykecausedbythereclamation.Affectedbyvegetationtypesandlandusepatterns,thecontentvariationrateofheavymetalsinthetid
8、alflatcoveredby印artinaalterniflorawasobviouslyhigherthanthatinthetidalflatcoveredbySuaedasalsa,andthecontentsofheavymetalsweregenerallydecreasedinthetid
此文档下载收益归作者所有