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地球科学进展  2020, Vol. 35 Issue (2): 198-208    DOI: 10.11867/j.issn.1001-8166.2020.019
研究论文     
茈碧湖现代沉积特征及其环境指示意义
刘柏妤1(),张虎才2(),常凤琴2,张扬1,张晓楠2,冯仡哲1,李华勇3
1.云南师范大学 旅游与地理科学学院 高原湖泊生态与全球变化实验室,云南 昆明 650500
2.云南大学生态与环境学院,高原湖泊生态与治理研究院,云南 昆明 650500
3.安阳师范学院资源与旅游学院,河南 安阳 455000
Modern Sedimentary Characteristics and Environmental Indication Significance of the Cibi Lake
Boyu Liu1(),Hucai Zhang2(),Fengqin Chang2,Yang Zhang1,Xiaonan Zhang2,Yizhe Feng1,Huayong Li3
1.Laboratory of Plateau Lake Ecology and Global Change, School of Tourism and Geographic Sciences, Yunnan Normal University, Kunming 650500, China
2.Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, China
3.School of Resource Environment and Tourism, Anyang Normal University, He'nan Anyang 455000, China
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摘要:

基于茈碧湖36个表层沉积物样品的粒度测试结果,结合流域内自然地理要素与统计分析,探讨了不同粒径组分的空间分布特征与规律,讨论了水动力条件、物源输入状况等环境影响因素,为该区域的古气候环境研究提供了科学依据与基础数据。研究结果表明:茈碧湖表层沉积物主要包括黏土、粉砂和砂3种类型,其中粉砂分布范围最广,为研究区主要沉积类型,主要受地下水补给扰动无明显空间变化规律;黏土组分范围分布较小,受山坡冲积扇影响,主要分布在湖泊西北部及靠近湖心区域,沉积环境相对稳定,是选择钻孔岩芯位置开展重建湖泊古气候环境演变研究的最佳位置;砂组分由于受入湖河流及人类活动影响,主要分布在湖泊西南角河流入湖口处及湖泊北部近岸区域,对湖泊表层沉积物来源影响较大,应加强对湖泊北部及西南区域的管理防止大量污染物进入湖泊;粒度频率曲线显示,沉积物主要包含有悬浮组分和跳跃组分,表明尽管沉积物物质除了主要来源于湖泊自身的一些生物化学作用形成及风成沉积物外,远距离搬运的粗颗粒物质仍然对沉积物粒度组分产生较大影响,断面CB-1表明:茈碧湖表层沉积物搬运及分布受河流影响明显,其次也受西南风的影响,作为河流入湖口处和上风向区域位置是注意防治污染的重点区域。

关键词: 茈碧湖粒度表层沉积物空间分布    
Abstract:

Based on the particle size test results of 36 surface sediment samples from the Cibi Lake, the spatial distribution characteristics and rules of components were discussed by the combination of natural geographical factors with statistical analysis methods in the basin, which provides scientific evidence and basic data for the study of paleoclimate environment in this region. The results show that: The samples mainly include clay, silty and sand, among which silty is the main type in the study area and has the widest distribution due to the disturbance caused by groundwater recharge without obvious spatial variation law; The clay distribution is somewhat smaller, and its locality affected by the slope alluvial fan is in the northwest and near the center of the lake, where the sedimentary environment is stable and is the best selected location for the borehole core so that the reconstruction of the paleoclimate environment can be carried out; Sand is mainly distributed in the southwest corner and near the north shore of the lake, which is influenced by the rivers entering the lake and human activities, and these two locations have a great influence on the source of surface sediment. Therefore, the management of the north and southwest regions should be strengthened to prevent a large number of pollutants from entering the lake; The grain size frequency curve shows that the sediments include suspended and saltant components. Besides the formation by their own biochemistry, other materials come from the aeolian sediments in the basin, and the coarse particles transported over a long distance have a great impact on the grain size components. Section CB-1 indicates that transport process and distribution are significantly affected by the southwest monsoon and more attention should be paid to the prevention and control of pollution at the river inlet and upwind area.

Key words: Cibi Lake    Particle size    Surface sediment    Spatial distribution
收稿日期: 2019-12-06 出版日期: 2020-03-24
ZTFLH:  P343.3  
基金资助: 云南省领军人才项目“云南高原湖泊演化与水安全研究”(2015HA024);云南省高端人才引进项目“云南(云贵高原)湖泊记录与生态环境及可持续发展研究”(2010CI111)
通信作者: 张虎才     E-mail: zhanghc@ynu.edu.cn
作者简介: 刘柏妤(1996-),女,云南红河人,硕士研究生,主要从事湖泊沉积与环境变化研究. E-mail:2263141840@qq.com
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引用本文:

刘柏妤, 张虎才, 常凤琴, 张扬, 张晓楠, 冯仡哲, 李华勇. 茈碧湖现代沉积特征及其环境指示意义[J]. 地球科学进展, 2020, 35(2): 198-208.

Boyu Liu, Hucai Zhang, Fengqin Chang, Yang Zhang, Xiaonan Zhang, Yizhe Feng, Huayong Li. Modern Sedimentary Characteristics and Environmental Indication Significance of the Cibi Lake. Advances in Earth Science, 2020, 35(2): 198-208.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2020.019        http://www.adearth.ac.cn/CN/Y2020/V35/I2/198

图1  茈碧湖流域及其采样点图
图2  洱源县2018年日均温和降水量(资料来源于中国气象数据网)
图3  茈碧湖表层沉积黏土(a)、粉砂(b)、砂(c)含量分布
图4  茈碧湖表层沉积物粒度各参数空间分布图(a)平均粒径;(b)分选系数;(c)偏态;(d)峰度
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So0.5602*0.24310.9817**0.9867**1
Sk0.40000.01680.40790.37730.45811
KG0.04250.35510.34900.39420.33901
表1  茈碧湖表层沉积物粒度参数相关关系
图5  茈碧湖粒度频率曲线
图6  CB-1剖面采样点粒度频率曲线
图7  洱源气象站2018年6月至2019年6月最大风速风向(逐日)玫瑰图
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