| 云南异龙湖沉积物粒度空间变化特征及其环境指示意义 |
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| 引用本文： | 张龙吴,张虎才,常凤琴,段立曾,胡京九,李婷,蔡萌,张扬.云南异龙湖沉积物粒度空间变化特征及其环境指示意义[J].第四纪研究,2019,39(5):1159-1170. |
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| 作者姓名： | 张龙吴 张虎才 常凤琴 段立曾 胡京九 李婷 蔡萌 张扬 |
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| 作者单位： | 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重点实验室,云南昆明650504;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重点实验室,云南昆明650504;云南大学生态学与环境学院,高原湖泊生态与治理研究院,云南昆明650504;云南大学生态学与环境学院,高原湖泊生态与治理研究院,云南昆明650504 |
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| 基金项目： | 国家自然科学基金;云南省领军人才项目;云南省高端科技人才引进项目 |
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| 摘 要： | 文章以滇东南浅水湖泊异龙湖作为研究对象,通过对湖泊不同位置的40个表层沉积物样品进行粒度测试,结合流域自然地理要素和人类活动特征,分析了异龙湖表层沉积物粒度空间分布特征,并探讨了其影响因素。结果表明,异龙湖表层沉积物沉积类型主要有粘土质粉砂、粉砂质粘土以及砂-粉砂-粘土3种,其中以粘土质粉砂类型为主,其次为粉砂质粘土。粉砂(4~63μm)为异龙湖表层沉积物优势粒径成分,其含量介于57.08%~82.41%,其次为粘土(小于4μm),介于11.22%~35.58%,砂组分(大于63μm)含量最低,含量介于0.16%~25.80%。异龙湖表层沉积物具有明显的空间分布特征,其中粉砂类似同心圆的空间分布特征,其含量由湖区的中间地带分别向西北、西南、东南3个方向递增;而粘土含量则呈现出相反的趋势。由于受断层影响,异龙湖表层沉积物各粒度组分形成了西北、东南两个相对对称的区域;西北湖区沉积物粒度分布特征同时受自然环境与人类活动的影响,沉积物类型主要有粘土质粉砂和粉砂质粘土,其中以粘土质粉砂为主;而东南深水湖区由于受人为干扰因素较弱,可以视为认识自然状态下物质搬运过程、探讨水动力特征以及研究自然湖泊沉积和气候变化的理想场所。
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| 关 键 词： | 异龙湖 湖泊沉积物 粒度 空间分布 环境意义 |
SPATIAL VARIATION CHARACTERISTICS OF SEDIMENT SIZE AND ITS ENVIRONMENTAL INDICATION SIGNIFICANCE IN LAKE YILONG,YUNNAN PROVINCE |
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| Zhang Longwu,Zhang Hucai,Chang Fenqin,Duan Lizeng,Hu Jingjiu,Li Ting,Cai Meng,Zhang Yang.SPATIAL VARIATION CHARACTERISTICS OF SEDIMENT SIZE AND ITS ENVIRONMENTAL INDICATION SIGNIFICANCE IN LAKE YILONG,YUNNAN PROVINCE[J].Quaternary Sciences,2019,39(5):1159-1170. |
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| Authors: | Zhang Longwu Zhang Hucai Chang Fenqin Duan Lizeng Hu Jingjiu Li Ting Cai Meng Zhang Yang |
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| Institution: | (Key Laboratory of Plateau Lake Ecology & Global Change,College of Tourism and Geography Science,Yunnan Normal University,Kunming 650500,Yunnan;Institute for Ecological Research and Pollution Control of Plateau Lakes,School of Ecology and Environmental Science,Yunnan University,Kunming 650504,Yunnan) |
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| Abstract: | Lake Yilong (23°38'~23°42'N, 102°30'~102°38'E), a shallow lake located in the southeastern part of Yunnan Province is one of main Nine-Plateau-Lakes in Yunnan Plateau. The grain size analyses is carried on 40 modern deposition samples taken from different positions of the lake. Taking into account the geographical background and human activity characteristics in the drainage area, the special distribution characteristics of sediment grain size and their variation trends, influence factors were discussed. The result showed that three types of surface sediments could be recognized, such as clayey silt, silty clay, and sand-silt clay. The surface sediments include clayey silt and silty clay, and a few samples are sand-silt clay. The modern sediments was mainly composed of silt (4~63 μm) accounting for 57.08%~82.41%, the clay (< 4 μm) accounted for 11.22%~35.58%, and the content of sand component (> 63 m) was the lowest, ranging from 0.16% to 25.80%. Additionally, the particle size showed a significant spatial pattern, and the silt showed gradually increased trend from the middle zone of the lake to the northwest, southwest and southeast. Meanwhile, the clay displayed the two high-value centers in the north of the study area, gradually declining to the northwest, southwest and southeast. The phenomenon may be controlled by fault zone cross the central part of the lake, resulting in a boundary and separate the lake into two parts, northwest part and a southeast part. The grain size distribution pattern of sediments in the northwest lake area is affected by both natural environment and human activities, showing that the main types of sediments are clayey silt and silty clay, of which clayey silt is the main type. The southeastern deep-water area is affected by human disturbance weakly, and it can be regarded as the suitable place to understand the material transport process, to discuss hydrodynamic characteristics, and to reconstruct lake evolution history in Lake Yilong. |
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| Keywords: | Lake Yilong lake sediment grain size spatial distribution environmental significance |
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