Pollen raw counts of sediment core LLCore2 from Lost Lake, British Columbia in 2020@en

This dataset provides pollen counts for the Holocene lacustrine sedimentary sequence retrieved from Lost Lake, Canada (49.4038, -122.9756, 235 m above sea level). The LLCore2 composite sediment core was collected from Lost Lake, in the Lower Seymour Conservation Reserve, North Vancouver, British Columbia, Canada in fall 2020. The composite core is composed of a 0.41 meter surface core, collected using a Glew gravity corer, and a 2.41 meter sediment core collected using a Livingstone piston corer. The chronology was established using 210Pb, 137Cs, and accelerator mass spectrometry 14C radiometric dating. 1-cm³ volumetric pollen samples were selected at 10-cm intervals along the core, and isolated according to Faegri and Iversen (1989) and Moore et al. (1991). Pollen and spores were counted using a Leica M205C stereomicroscope, and measured against depth (m) and age (ka BP). These data were collected to provide information about local and regional changes in ecosystem composition and fire activity throughout the Holocene in the Lower Mainland of British Columbia.本数据集提供了加拿大失落湖（Lost Lake）获取的全新世湖相沉积序列的花粉计数数据，该点位坐标为49.4038°N、122.9756°W，海拔235米。本次研究的复合沉积柱LLCore2采集自加拿大不列颠哥伦比亚省北温哥华市下西摩保护区内的失落湖，采集时间为2020年秋季。该复合沉积柱由两部分组成：一是采用Glew重力采样器采集的0.41米表层岩芯，二是采用Livingstone活塞采样器采集的2.41米沉积岩芯。年代序列通过210Pb、137Cs以及加速器质谱（accelerator mass spectrometry, AMS）14C放射性测年方法构建。研究人员沿岩芯以10厘米为间隔选取1立方厘米的体积花粉样品，并依据Faegri与Iversen（1989）、Moore等人（1991）的方法完成样品分离。花粉与孢子采用Leica M205C体视显微镜进行计数，分析结果以深度（米）和年龄（千年BP，ka BP）为标尺呈现。本数据集的采集旨在为不列颠哥伦比亚省低陆平原地区全新世以来的局地与区域生态系统组成变化及火灾活动提供数据支撑。