全新世以来岱海湖泊沉积与环境演变
Holocene Lake Sediments and Environmental Changes in Daihai
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摘要: 岱海湖泊位于半干旱区东部边缘及东亚夏季风的尾闾区,生态环境体系脆弱,气候和环境变化敏感,是研究环境演变的理想地区。全新世以来, 由于气候的变化和季风的强弱而引起的气候带界限的迁移极为频繁, 使得本区成为一个气候敏感区。利用内陆封闭湖泊沉积物连续性强、分辨率高、对气候敏感等特点,以单一流域化学风化记录恢复了岱海地区全新世以来的环境演化过程。根据岱海湖泊岩心沉积物的粒度变化、孢粉来源和分布以及有机碳及其同位素指标序列分析,结合210Pb测定的沉积速率,讨论了岱海全新世以来的气候环境演化过程。从空间尺度、不同时间尺度与其他研究结果的对比以及代用指标与气候要素的关系研究等几个方面总结了全新世以来高原湖泊岱海沉积与环境演变研究的主要成果。Abstract: The Daihai Lake is located in the east margin of semiarid region and the north margin of East Asian summer monsoon. Being fragile in ecological environment system and sensitive to changes in climate and environment, it is an ideal location for environmental evolution study. Since Holocene, the frequent migration of climate zone boundaries due to climate change and intensity of monsoon has transferred this area into a climate-sensitive region. Based on characteristics like strong continuity of inland lake sediments, high resolution and climate-sensitive, this paper restored the environmental evolution process since Holocene, by using single water chemical weathering record. Moreover, the process is discussed in details according to the granular changes of core sediments, pollen sources and distribution, organic carbon and its isotopic index sequence analysis, as well as the deposition rate determinated by Pb-210 data. Finally, the major findings of Daihai Lake sediments and environmental evolution since Holocene were summarized on the basis of a comparison analysis with other researches from the perspectives of spatial scales and different time scales, and on the relationship study between climate proxy index and climatic factors.
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Key words:
- Daihai Lake /
- lake sediments /
- environmental changes /
- progress
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