连环湖牙门喜泡近现代环境变化的沉积物粒度研究  

Tracing the latest environmental change from the records of Yamenxi blister sediment grain size in Lianhuan Lake

作　　者：徐海凤[1] 肖海丰[1] 臧淑英[1] 刘少军[1] 关莹[1] 

机构地区：[1]哈尔滨师范大学黑龙江省普通高等学校地理环境遥感监测重点实验室,哈尔滨150025

出　　处：《安全与环境学报》2013年第4期126-129,共4页Journal of Safety and Environment

基　　金：国家自然科学基金项目(40972115);国家自然科学基金重点项目(41030743);黑龙江省高等学校科技创新团队建设计划项目(2010td10)

摘　　要：通过对连环湖牙门喜泡沉积物柱芯样品的放射性核素210Pb和137Cs的测试,确定了过去50多年的湖泊连续沉积序列。根据连环湖的湖区特点,对沉积物的粒度特征进行了分析。结果表明,牙门喜泡柱芯的黏土（〈2μm）、粉砂（2~63μm）、极细砂（63~125μm）和细砂（〉125μm）含量分别为9.79%、49.96%、11.45%和28.8%,平均粒径为4.44~10.61μm。粒度参数根据图解法求得,分选系数So分布范围为2.09~3.04,偏度SK分布范围为-0.19~0.57。1952年以来,牙门喜泡的沉积环境演化大致可以划分为3个阶段,3个阶段湖泊水位的高低、气候的变化与同时期平均粒径的变化均有较好的相关性,表明不同时期沉积物粒度特征指示了不同的沉积环境。The present article takes it as the aim of our investigation and analysis to trace the latest environmental changes from the records and registrations of Yamenxi blister sediment grain size in Lianhuan Lake.Lianhuan Lake is a prestigious big shallow lake in the Songnen Plain,which consists of 18 smaller ones.The Yamenxi blister is located in the southwest of the lake.We have collected our test samples from the lake＇s sediment cores with contents of radionuclides 210Pb and 137Cs mainly from the Yamenxi blister.Aiming to confirm the continuous sedimentary evolutionary sequence of the lakes in the past 50 years,we have done careful analysis of the grain size characteristic of the Yamenxi blister cores from the clay（2 μm） and silt（2-63 μm）,the extremely tiny fine sands（63-125 μm） and ordinarily fine sands（125 μm） and found that the contents of radionuclides 210Pb and 137Cs accounted for about 9.79%,49.96%,11.45% and 28.8%,respectively,with average particle size being 4.44-10.61 μm.Then,we have obtained the particle size parameters in a graphic way by sorting out the coefficient range of 2.09-3.04 and the skewness in a distribution range from-0.19 to 0.57.Joining the entire column cell calculation results and the grain size classification,we have roughly divided the change of average particle diameters of the sediments into three stages beginning from 1952 due to the sedimentary environment evolution,though the changing situation of the three stages turned to be fluctuating.Through analysis in a scientific way,it has been found that the change of average particle size from the first and third stage proves to be more obvious,which indicates the unstable sedimentary environment.In comparison with these two stages,we have noticed little change with the second stage,which indicates a relatively stable sedimentary environment.Joining the results of the analysis,we have found that the three stages of lake water levels,the climate change and that of the average particle size during the same periods are

关 键 词：环境学 沉积物粒度 牙门喜泡 沉积环境 

分 类 号：X52[环境科学与工程—环境工程]