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 上一篇    下一篇

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. 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
  • 收稿日期:2019-12-06 修回日期:2020-01-24 出版日期:2020-02-10
  • 通讯作者: 张虎才 E-mail:zhanghc@ynu.edu.cn
  • 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)

Modern Sedimentary Characteristics and Environmental Indication Significance of the Cibi Lake

Boyu Liu 1( ),Hucai Zhang 2( ),Fengqin Chang 2,Yang Zhang 1,Xiaonan Zhang 2,Yizhe Feng 1,Huayong Li 3   

  1. 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
  • Received:2019-12-06 Revised:2020-01-24 Online:2020-02-10 Published:2020-03-24
  • Contact: Hucai Zhang E-mail:zhanghc@ynu.edu.cn
  • About author:Liu Boyu (1996-), female, Honghe County, Yunnan Province, Master student. Research areas include lake sedimentation and environmental change. E-mail: 2263141840@qq.com
  • Supported by:
    the Yunnan Provincial Leading Talent Project "Yunnan Plateau Lake evolution and water security research"(2015HA024);The Yunnan Province Senior Talent Project "Lake records and ecological environment and sustainable development in Yunnan (the Yunnan-Guizhou Plateau)"(2010CI111)

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。

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.

中图分类号: 

图1 茈碧湖流域及其采样点图
Fig. 1 The general situation of the catchment of the Cibi Lake and its sampling points
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)
Fig. 2 Eryuan County in 2018 average daily temperature and daily precipitation(data from China Meteorological Data Network)
图3 茈碧湖表层沉积黏土(a)、粉砂(b)、砂(c)含量分布
Fig. 3 Distribution of clay (a), silt (b) and sand (c) contents in the surface sediment of the water
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
Fig.4 Spatial distribution of parameters of sediment grain size on the surface of the water
(a)Mean grain size;(b)Sorting coefficient;(c)Skewess;(d)Kurtosis
表1 茈碧湖表层沉积物粒度参数相关关系
Table 1 Correlation between the parameters of grain size of sediment in the surface layer of Cibi Lake
图5 茈碧湖粒度频率曲线
Fig.5 Grain size frequency curve of the water Chestnut Lake
图6 CB-1剖面采样点粒度频率曲线
Fig.6 The sampling point frequency curve on the specific section
图7 洱源气象站20186月至20196月最大风速风向(逐日)玫瑰图
Fig.7 Rose chart of maximum wind speed direction of Eryuan meteorological station from June, 2018 to June, 2019 (daily monitoring)
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