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干旱区地理 ›› 2025, Vol. 48 ›› Issue (1): 53-62.doi: 10.12118/j.issn.1000-6060.2024.059 cstr: 32274.14.ALG2024059

• 植物生态 • 上一篇    下一篇

中国季风边缘区表土孢粉分布特征及其影响因素

吴思琪1(), 魏海芹2, 陈春珠1(), 魏立斯1, 赵文伟1, 李焕1, 孙义1, 蒋庆丰1, 张肖剑3, 赵艳4   

  1. 1.南通大学地理科学学院,江苏 南通 226019
    2.临朐县山旺国家级自然保护区管护中心,山东 潍坊 262617
    3.南京大学地理与海洋科学学院,江苏 南京 210023
    4.中国科学院地理科学与资源研究所,北京 100101
  • 收稿日期:2024-01-26 修回日期:2024-05-30 出版日期:2025-01-25 发布日期:2025-01-21
  • 通讯作者: 陈春珠(1988-),女,博士,副教授,主要从事古生态与古气候研究. E-mail: pollenchencz@gmail.com
  • 作者简介:吴思琪(2005-),女,本科生,主要从事古生态与古气候研究. E-mail: wh2113657@163.com
  • 基金资助:
    国家重点研发计划项目(2022YFF0801501);国家自然科学基金项目(42171157);国家自然科学基金项目(41907379)

Distribution characteristics and its influencing factors of surface soil pollen in the marginal monsoon region of China

WU Siqi1(), WEI Haiqin2, CHEN Chunzhu1(), WEI Lisi1, ZHAO Wenwei1, LI Huan1, SUN Yi1, JIANG Qingfeng1, ZHANG Xiaojian3, ZHAO Yan4   

  1. 1. School of Geographic Science, Nantong University, Nantong 226019, Jiangsu, China
    2. Shanwang National Nature Reserve Management and Conservation Center at Linqu, Weifang 262617, Shandong, China
    3. School of Geography and Ocean Sciences, Nanjing University, Nanjing 210023, Jiangsu, China
    4. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, Beijing, China
  • Received:2024-01-26 Revised:2024-05-30 Published:2025-01-25 Online:2025-01-21

摘要: 研究中国季风边缘区表层土壤孢粉分布特征及其影响因素,有助于提高化石孢粉重建区域植被和古季风演变的可靠性。通过对中国季风边缘区的38个样点(年降水量区间30~650 mm)的表土样品进行孢粉分析,研究了表土孢粉组合特征与气候、人类活动之间的关系。结果表明:(1) 在低海拔、温带草原地区,气候相对温暖干燥,孢粉组合以苋科和蒿属为主,且蒿藜比(A/C比值)与年均降水量变化趋势基本一致。(2) 中国季风边缘区的高海拔、高寒草原草甸地区,气候相对寒冷湿润,孢粉组合以莎草科、菊科和禾本科为主导,蒿属和苋科花粉的百分比之和平均为25.8%,并且该区域A/C比值与年均降水量未呈现明显相关性。(3) 乔灌木孢粉总百分比与年均气温/最热月气温之间的相关性要强于与年均降水量之间的相关性。(4) 这些孢粉组合特征反映了中国季风边缘区植被和水热条件在海拔上的分布特征,孢粉数据冗余分析(RDA)结果也清晰揭示了孢粉组合及主要花粉类型在最热月气温和海拔梯度上的分布。此外,真菌孢子在研究区高寒地区土壤表层中大量出现,反映了该区域放牧强度大、伴随土壤侵蚀速率高的环境特征。

关键词: 季风边缘, 表土孢粉, 植被, 气候, 放牧强度

Abstract:

Studying the distribution characteristics of surface soil pollen in the marginal monsoon region of China and the factors influencing this distribution improves the reliability of reconstructing regional vegetation and paleo-monsoon evolution based on fossil pollen data. Through surface soil pollen analysis of 38 sampling sites with annual precipitation ranging from 30-650 mm in the marginal monsoon region of China, this study investigates the relationships among surface pollen assemblages, climate, and human activities. The results reveal that: (1) In low-altitude temperate steppe regions with a relatively warm and dry climate, Amaranthaceae and Artemisia dominate the pollen assemblages, and the ratio of Artemisia/Chenopodiaceae (A/C ratio) generally aligns with average annual precipitation. (2) In high-altitude alpine steppe and meadow regions with a relatively cold and humid climate, pollen assemblages are dominated by Cyperaceae, Asteraceae, and Poaceae. The summed percentages of Artemisia and Amaranthaceae pollen average 25.8%, and no distinctive correlation exists between the A/C ratio and average annual precipitation in these regions. (3) The total tree and shrub pollen percentages exhibit a stronger correlation with average annual temperature and the temperature of the warmest month compared to average annual precipitation. (4) These pollen assemblage characteristics reflect the vegetation distribution and hydrothermal conditions at varying altitudes in the marginal monsoon region of China. Redundancy analysis (RDA) of the pollen data also reveals the distribution of pollen assemblages and major pollen types along gradients of the warmest month temperature and altitude. In addition, the high abundance of fungal spores on the soil surface in the alpine region reflects environmental characteristics associated with significant grazing intensity and a subsequent high soil erosion rate.

Key words: marginal monsoon region, surface soil pollen, vegetation, climate, grazing intensity