闽北古亭水库沉积物粒度组成及其对气候的响应  

Grain Size Composition of Sediment from Guting Reservoir in Wufu Town and Its Response to Climate

作　　者：叶宏萌 李青玉 华伟平 苏丽鳗 左邦瑞 陈菱 林江玲 YE Hongmeng;LI Qingyu;HUA Weiping;SU Liman;ZUO Bangrui;CHEN Ling;LIN Jiangling(Fujian Key Laboratory of Eco-Industrial Green Technology,School of Ecology and Resources Engineering,Wuyi University,Wuyishan,Fujian 354300)

机构地区：[1]武夷学院,生态与资源工程学院,福建省生态产业绿色技术重点实验室,福建武夷山354300

出　　处：《武夷学院学报》2023年第9期48-52,共5页Journal of Wuyi University

基　　金：福建省一流本科课程(SJKC20201202);福建省一般教改项目(FBJG20210044);武夷学院课程建设与改革(课程思政)研究项目(KC202104);国家级大学生创新训练项目(202110397016)。

摘　　要：通过放射性核素^(137)Cs和^(210)Pbex估算水库沉积物柱芯年代,以水库竣工时间为起始时间建立了古亭水库沉积物的年代序列。运用沉积物粒度组分分析54年来水库沉积对气候的响应特征,结果表明:在2010年前沉积速率变化幅度较小,沉积环境较为稳定,而2010年后沉积速率变化幅度较大,该时期异常变化与人类活动密切相关。根据中值粒径特征并结合年降雨量、年平均气温变化,揭示了气候变化和人类活动对水库沉积物的影响:(1)中值粒径与降雨量变化整体对应性不高,不过对于部分特殊降水年份仍具有指示作用。如1971年枯水年,中值粒径相应的出现了谷值;1998年丰水年,中值粒径相应地出现了峰值。(2)在2012年前中值粒径变化呈上升趋势对应了气候的升温,在2012年后中值粒径与气温变化同步性下降,该阶段主要反映流域产业结构发生调整、人类活动对流域环境的影响。The core age of reservoir sediment is estimated by radionuclides ^(137)Cs and ^(210)Pbex,and the age series of Guting reservoir sediment is established with the completion time of the reservoir as the starting time.The response characteristics of reservoir sedimentation to climate in the past 54 years are analyzed by using sediment particle size composition.The results show that the change range of sedimentation rate before 2010 is small and the sedimentary environment is relatively stable,while the change range of sedimentation rate after 2010 is large.The abnormal change in this period is closely related to human activities.According to the characteristics of median particle size,combined with the changes of annual rainfall and annual average temperature,this paper reveals the impact of climate change and human activities on reservoir sediments:(1)the overall correspondence between median particle size and rainfall change is not high,but it still has indication function for some special precipitation years.For example,in the dry year of 1971,the median particle size appeared valley value accordingly;In the wet year of 1998,the median particle size correspondingly peaked.(2)Before 2012,the change of median particle size showed an upward trend,corresponding to the warming of climate.After 2012,the change of median particle size and temperature decreased synchronously.This stage mainly reflects the adjustment of river basin industrial structure and the impact of human activities on river basin environment.

关 键 词：沉积物粒度 ^(137)Cs ^(210)Pbex 气温 降雨量 

分 类 号：X524[环境科学与工程—环境工程]