湖泊科学2011，Vol.23Issue(2)：295-302,8.
甘肃石羊河流域猪野泽湖泊沉积物粒度敏感组分与花粉组合关系
Relationship between grain-size sensitive components and pollen assemblages in the lake sediments of Lake Zhuye, Shiyang River Basin, Gansu Province
摘要
Abstract
We hand-excavated a profile named QTH02 in a terminal lake in Shiyang River, Lake Zhuye.The QTH02 was sampled at 2cm intervals in which 368 samples were yielded for analysis of grain-size, and sampled at 10cm intervals in which 74 samples were yielded for pollen analysis.Based on the correlation analysis, the results showed that the variables between sensitive components of the grain-size and pollen assemblages are related with each other.The total pollen concentration and percentages of Ephedra, Nitraria, Chenopodiaceae, Typha and Picea are positively correlated with the grain-size sensitive components that the sizes are less than 89.31 μm, and negatively correlated with the grain-size sensitive components that the sizes are larger than 89.31 μm.The percentages of Betula, Quercu, and Urtica are positively correlated the grain-size sensitive components that the sizes are more than 89.31 μm.The correlation between the pollen assemblages and grain-size sensitive components is mainly controlled by the moisture conditions of the basin and water level of the Lake Zhuye, which is also affected by wind transportation.The pollen proxies which are correlated with the fine components are mainly affected by the hydrodynamics of the drainage basin and high lake-level, and the pollen proxies which are correlated with the coarse components are mainly affected by low lake-level and eolian activities.While the drainage basin is relatively humid and the lake-level is relatively high, the total pollen concentration and percentages of river-transported pollen are relatively high.While the drainage basin is relatively arid, the total pollen concentration is relatively low, but the percentages of wind-transported pollen are relatively high.Then, based on the relationships between the grain-size sensitive components and pollen assemblages, we divided the climatic and environmental changes in Lake Zhuye since the Late Clacial into six stages.The climate is moist in the Early and Middle Holocene but dry in the Late Clacial and Late Holocene.关键词
猪野泽/湖泊沉积物/粒度敏感组分/花粉组合/石羊河流域Key words
Lake Zhuye/ lacustrine sediments/ sensitive grain-size to environments/ pollen assemblages/Shiyang River Basin引用本文复制引用
李育,王乃昂,李卓仑..甘肃石羊河流域猪野泽湖泊沉积物粒度敏感组分与花粉组合关系[J].湖泊科学,2011,23(2):295-302,8.基金项目
国家自然科学基金项目(41001116)和兰州大学中央高校基本科研业务专项资金(lzujbky-2010-99)联合资助. （41001116）
