猪野泽不同位置沉积物碳酸盐含量与花粉保存

Carbonate Content and Pollen Conservation in Lacustrine Sediments at Different Locations of the Zhuye Lake

孢粉是恢复古气候、古植被重要的代用指标。根据已有的研究成果,猪野泽孢粉组合所指示的全新世气候环境变化存在较大分歧。湖泊碳酸盐沉积可以指示碱性沉积环境,而碱性环境对孢粉的腐蚀较大,影响花粉的保存。所以,研究湖泊沉积物中碳酸盐含量与孢粉保存的关系,可以探讨该区域花粉保存是否受到过盐湖沉积的影响,并可进一步探讨该区域花粉组合的差异是否与花粉保存有关。结果表明:在猪野泽全新世两个成湖期,高碳酸盐含量与高孢粉浓度相对应。虽然,高碳酸盐含量对应的强碱性环境对孢粉的腐蚀性大,但当时猪野泽成湖期内气候温暖湿润,孢粉输入量非常大,以至于碱性沉积环境不足以改变孢粉的浓度。因此,猪野泽不同位置沉积物碳酸盐含量与花粉保存情况无明显相关关系,以上分歧的出现不是由孢粉保存引起的。

Pollen is a proxy to be used to reconstruct paleo-climate and paleo-vegetation.According to the available previous research achievements,there are some different points of view in recognizing the Holocene climate and environmental changes indicated by pollen in the Zhuye Lake region.Lacustrine carbonate sediments can be used to reveal the alkaline sedimentary environment,but the alkaline environment can corrode pollen seriously and impact pollen conservation.According to the relationship between carbonate and pollen concentration in lacustrine sediments,it can be explored that whether the regional pollen conservation was affected by carbonate.The results showed that the high carbonate content and the high pollen concentration corresponded with each other in the Zhuye Lake region during the Holocene.Climate was warm and wet in the Zhuye Lake region during the period of lake expansion,and there was a large amount of pollen input,although the alkaline environment corroded pollen seriously and affected pollen conservation.Therefore,the alkaline sedimentary environment was not enough to change pollen concentration.The different mid-Holocene pollen assemblages at different locations of the lake basin were not resulted in by pollen conservation.