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： \mathrm{①} 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； \mathrm{②} 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； \mathrm{③} 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； \mathrm{④} 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: \mathrm{①} 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; \mathrm{②} 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; \mathrm{③} 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; \mathrm{④} 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.