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| 祁连山内流河流域表土和终端湖沉积物粒度指标研究 | |
| 引用本文： | 陈大伟, 李育, 张新中, 韩琴, 徐玲梅, 叶旺庭. 祁连山内流河流域表土和终端湖沉积物粒度指标研究[J]. 第四纪研究, 2020, 40(5): 1216-1230. doi: 10.11928/j.issn.1001-7410.2020.05.11 |
| 作者姓名： | 陈大伟 李育 张新中 韩琴 徐玲梅 叶旺庭 |
| 作者单位： | 兰州大学资源环境学院, 甘肃 兰州 730000 |
| 基金项目： | 国家自然科学基金项目（批准号：41822708）、中国科学院（A类）战略性先导科技专项项目（批准号：XDA20100102）和科技部、中国科学院第二次青藏高原综合科学考察研究项目（批准号：2019QZKK0202）共同资助 |
| 摘 要： |  通过对祁连山地区典型内流河——石羊河、丰乐河、石油河和布哈河流域表土及终端湖全新世剖面沉积物中粒度指标的分析和对比,结果表明:1)流域表土粒径随海拔变化具有明显的空间分异特征,大致以河流出山口海拔为界分为上下游两部分,除石油河外,上游以粉砂组分为主,粒度频率曲线表现为河流沉积的双峰特征,粒径波动较小并随海拔有降低趋势,反映河流初始水动力较强并逐渐减弱;下游以砂组分为主,粒度频率曲线具有风成沉积特征,指示干旱化趋势,粒径变化幅度和频率大,表明受人类活动影响强烈; 2)终端湖剖面沉积物粒度显示了全新世以来复杂的干湿变化,在约3 cal. ka B. P.之后均出现粒径增大波动增大的现象,指示不同程度的干旱化,在1～3 cal. ka B. P.之间出现人类活动的影响并逐渐加剧; 3)基于流域表土粒度指标现代过程分析表明祁连山内流河流域终端湖剖面粒度指标可以在一定程度上指示流域干湿变化并识别人类活动强度,区域环境在长期干旱化的背景下受到人类活动的强烈干扰。   |
| 关 键 词： | 祁连山 内流河 沉积物 粒度 环境变化 |
| 收稿时间： | 2019-09-11 |
| 修稿时间： | 2020-01-21 |
Study on grain size indicator of surface soil and terminal lake sediments in closed basins over Qilian Mountains |
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| Chen Dawei, Li Yu, Zhang Xinzhong, Han Qin, Xu Lingmei, Ye Wangting. Study on grain size indicator of surface soil and terminal lake sediments in closed basins over Qilian Mountains[J]. Quaternary Sciences, 2020, 40(5): 1216-1230. doi: 10.11928/j.issn.1001-7410.2020.05.11 | |
| Authors: | Chen Dawei Li Yu Zhang Xinzhong Han Qin Xu Lingmei Ye Wangting |
| Affiliation: | College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Gansu |
| Abstract: | Four typical closed basins of Qilian Mountains, Shiyang River basin, Fengle River basin, Shiyou River basin and Buha River basin are selected as the study areas. Surface soil and 30 cm underground soil samples along both sides of the river are collected to analyze the grain size characteristics of these regions. Median grain size and average grain size of the soil samples, combined with the terminal lakes records of these basins (including median grain size, average grain size, and grain size composition) are used to analyze the characteristics of the environmental changes in these four river basins during the Holocene. The results show: |
| Keywords: | Qilian Mountains interior river sediment grain size environmental change |
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