地理学报 ›› 2022, Vol. 77 ›› Issue (5): 1195-1210.doi: 10.11821/dlxb202205011
王娜1(), 许清海1,2(
), 张生瑞1,2, 阳小兰3, 王丹丹1, 孙沅浩4, 王涛4
收稿日期:
2021-06-27
修回日期:
2022-04-08
出版日期:
2022-05-25
发布日期:
2022-07-25
通讯作者:
许清海(1951-), 男, 河北石家庄人, 教授, 主要从事全球变化与第四纪孢粉学研究。E-mail: xuqinghai@hebtu.edu.cn作者简介:
王娜(1996-), 女, 山西大同人, 硕士生, 自然地理学专业。E-mail: wnangnaw@163.com
基金资助:
WANG Na1(), XU Qinghai1,2(
), ZHANG Shengrui1,2, YANG Xiaolan3, WANG Dandan1, SUN Yuanhao4, WANG Tao4
Received:
2021-06-27
Revised:
2022-04-08
Published:
2022-05-25
Online:
2022-07-25
Supported by:
摘要:
华北平原晚冰期以来气候环境演变研究对该地区社会发展、灾害风险评估和科学应对未来全球增温背景下极端降水和洪涝事件具有重要意义。本文以华北平原中部白洋淀地区高阳剖面(BG-2019)为研究对象,通过高精度AMS14C、OSL定年技术和高分辨率孢粉组合、粒度组分分析,恢复和重建了白洋淀地区晚冰期以来(距今13710 a—今)区域植被演替和气候环境变化历史。结果显示:BG-2019剖面在距今10270~13710 a和距今4630~5400 a发育湖相沉积,距今3470~3700 a发育沼泽相沉积;距今7130~8000 a发育河流—入湖三角洲相沉积,距今3700~4630 a和距今3230~3470 a发育河流相沉积;距今8000~10270 a和距今5400~7130 a存在明显的沉积间断/地层缺失;表明采样剖面所在位置缺乏连续的湖相地层。晚冰期白洋淀为局地小湖沼;中全新世湖沼较发育、范围广,但也不是连续广袤的湖相沉积;晚全新世湖泊范围收缩。晚冰期和全新世白洋淀流域植被景观存在显著差异;晚冰期气候寒冷干燥,平原发育以蒿属、藜亚科、禾本科和菊科等为主的草地,周围山地森林覆盖度低;中全新世气候温暖湿润,平原大部仍发育以蒿属、藜亚科和禾本科为主的草地,湖区水蕨和水生植物繁盛,周围山地生长松属、栎属为主的针阔混交林,森林覆盖度增高;晚全新世气候温和偏干,平原仍是以蒿属、藜亚科和禾本科等为主的草地,西部山地生长以松属为主的针阔混交林,森林覆盖度较高。
王娜, 许清海, 张生瑞, 阳小兰, 王丹丹, 孙沅浩, 王涛. 白洋淀地区晚冰期以来的气候和环境演变[J]. 地理学报, 2022, 77(5): 1195-1210.
WANG Na, XU Qinghai, ZHANG Shengrui, YANG Xiaolan, WANG Dandan, SUN Yuanhao, WANG Tao. Climatic and environmental evolution of the Baiyangdian area since the Lateglacial[J]. Acta Geographica Sinica, 2022, 77(5): 1195-1210.
表1
BG-2019剖面AMS14C年龄
沉积相 | 取样部位 | 深度(m) | 测试材料 | 14C年龄(a BP) | 校正年龄 (2σ, cal a BP) | 校正年龄中值 (cal a BP) |
---|---|---|---|---|---|---|
湖相层Ⅱ | 顶部 | 2.48~2.50 | 全样 | 3850±30 | 4153~4406 | 4268 |
中部 | 3.00~3.02 | 全样 | 4560±30 | 5052~5436 | 5185 | |
底部 | 3.42~3.44 | 全样 | 4690±30 | 5319~5553 | 5392 | |
湖相层Ⅰ | 顶部 | 4.48~4.50 | 全样 | 9180±30 | 10244~10486 | 10329 |
中部 | 5.00~5.02 | 全样 | 9980±30 | 11269~11682 | 11419 | |
底部 | 6.00~6.02 | 全样 | 11880±40 | 13602~13800 | 13712 |
表2
BG-2019剖面OSL年代数据
沉积相 | 取样部位 | 深度 (m) | U (ppm) | Th(ppm) | K(%) | 等效剂量E.D (Gy) | 年剂量Dy (Gy/ka) | 含水量(%) | 年龄(a) |
---|---|---|---|---|---|---|---|---|---|
河流相层Ⅱ | 顶部 | 0.6~0.64 | 1.94 | 9.61 | 1.65 | 11.26±0.48 | 3.44±0.14 | 11.5 | 3300±200 |
河流相层Ⅰ | 顶部 | 1.28~1.32 | 1.81 | 9.36 | 1.74 | 13.16±0.89 | 3.43±0.14 | 14.1 | 3800±300 |
中部 | 1.80~1.84 | 1.77 | 8.91 | 1.74 | 15.04±1.10 | 3.30±0.13 | 22.2 | 4600±400 | |
底部 | 2.46~2.50 | 1.70 | 8.61 | 1.67 | 15.00±0.79 | 3.19±0.13 | 19.5 | 4700±300 | |
河流—入湖三角洲相层 | 顶部 | 3.56~3.60 | 1.73 | 9.87 | 1.68 | 23.88±0.67 | 3.29±0.13 | 21.7 | 7300±400 |
底部 | 4.36~4.40 | 1.65 | 9.04 | 1.69 | 25.50±1.99 | 3.17±0.13 | 24.0 | 8000±700 |
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