武汉东湖(官桥湖)沉积剖面的垂向磁性特征及其对环境污染的响应  

Vertical Magnetism Characteristic on Sediment Section at East Lake(Guanqiao Lake)of Wuhan,China and Its Response to Environment Pollution

作　　者：李永涛[1] 曲赞[1] 

机构地区：[1]中国地质大学地球物理与空间信息学院,武汉430074

出　　处：《地质科技情报》2014年第6期226-232,共7页Geological Science and Technology Information

摘　　要：利用湖泊清淤工程,对武汉东湖（官桥湖）湖泊沉积物进行了垂向样品的采集并测量了其环境磁学参数和重金属元素含量。根据其沉积物垂向磁性变化特征,以沉积速率作为时间标尺,结合东湖周边地区相关工业资料,初步建立了该＂磁记录＂与东湖周边地区城市化过程中环境演化的关系。结果表明,粒度较细且为准单畴颗粒、低矫顽力的亚铁磁矿物主导了沉积物的磁性特征。在深度44cm之下,磁参数量值均较低;在深度44~6cm之间,沉积物磁参数量值随深度的减小而逐步平稳增加;由深度6cm至表层,磁参数量值随深度减小而减小。沉积物的磁性变化特征与1956年以来的钢铁产量、机动车保有量和人均GDP变化均较为一致。East Lake is the largest epicenter lake in city of China,and heavy industries,CBD and densely populated areas are around it.As the industrialization and urbanization increase,the problem of environment pollution and monitoring as well as treatment have been concerned by public.The environmental magnetism parameters and content of heavy metal elements,from the sediment specimen vertically sampled at East Lake（Guanqiao Lake）,were measured.The relationship between＂magnetic record＂and environmental pollution during the urbanization around East Lake has been preliminarily established,based on characteristics of vertical magnetism,temporal scale on sedimentary rate and related industrial information about this area.It is shown that the ferrimagnetic minerals with Pseudo-single domain particles and low coercivity predominate the magnetism of the sediments,having finer granularity.The magnetic parameters of particles with the depth lower than 44 cm are generally low;and between 44-6cm,the values of the magnetic parameters from the sediment gradually increase as the depth decreases;while the depth of 6cm to the top layer,the values exhibit the decreasing trend as the depth decreasing.The variation characteristics of sediment magnetism above are coincident with output of iron and steel since 1956,the quantity of vehicles and averaged GDP,It shows that the method mentioned above can provide a new and effective monitoring technique in tracing and indicating heavy metals pollution of lake sediment in city during urbanization process.

关 键 词：武汉东湖 湖泊沉积物 磁性特征 重金属元素污染 环境变化 

分 类 号：X14[环境科学与工程—环境科学]