干旱区科学2023，Vol.15Issue(3) ：327-343.

Modern pollen assemblages and their relationships with vegetation and climate on the northern slopes of the Tianshan Mountains, Xinjiang, China

ZHANG Wensheng AN Chengbang LI Yuecong ZHANG Yong LU Chao LIU Luyu ZHANG Yanzhen ZHENG Liyuan LI Bing FU Yang DING Guoqiang
干旱区科学2023，Vol.15Issue(3) ：327-343.
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  • NETL
  • NSTL
  • 维普
  • 万方数据

Modern pollen assemblages and their relationships with vegetation and climate on the northern slopes of the Tianshan Mountains, Xinjiang, China

ZHANG Wensheng 1AN Chengbang 1LI Yuecong 2ZHANG Yong 1LU Chao 1LIU Luyu 1ZHANG Yanzhen 1ZHENG Liyuan 1LI Bing 2FU Yang 1DING Guoqiang1
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作者信息

  • 1. Key Laboratory of Western China's Environmental Systems,Ministry of Education,College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China
  • 2. College of Geographical Sciences,Hebei Normal University,Shijiazhuang 050024,China
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Abstract

The reconstruction of paleovegetation and paleoclimate requires an understanding of the relationships between surface pollen assemblages and modern vegetation and climate. Here, we analyzed the characteristics of surface pollen assemblages across different vegetation zones in the Tianshan Mountains. Using surface pollen analysis and vegetation sample surveys at 75 sites on the northern slopes of the Tianshan Mountains, we determined the correlation between the percentage of dominant pollen types and the corresponding vegetation cover. Redundancy analysis was used to investigate the relationships between surface pollen assemblages and environmental factors. Our results show that the Tianshan Mountains contain several distinct ecological regions, which can be divided into five main vegetation zones from low to high altitudes: mountain desert zone (Hutubi County (HTB): 500–1300 m; Qitai County (QT): 1000–1600 m), mountain steppe zone (HTB: 1400–1600 m; QT: 1650–1800 m), mountain forest zone (HTB: 1650–2525 m; QT: 1850–2450 m), subalpine meadow zone (HTB: 2550–2600 m; QT: 2500–2600 m), and alpine mat vegetation zone (HTB: 2625–2700 m; QT: 2625–2750 m). The surface pollen assemblages of different vegetation zones can accurately reflect the characteristics of the mountainous vegetation patterns on the northern slopes of the Tianshan Mountains when excluding the widespread occurrence of Chenopodiaceae, Artemisia, and Picea pollen. Both average annual precipitation (Pann) and annual average temperature (Tann) affect the distribution of surface pollen assemblages. Moreover, Pann is the primary environmental factor affecting surface pollen assemblages in this region. A significant correlation exists between the pollen percentage and vegetation cover of Picea, Chenopodiaceae, Artemisia, and Asteraceae. Moreover, Picea, Chenopodiaceae, and Artemisia pollen are over-represented compared with their corresponding vegetation cover. The Asteraceae pollen percentage roughly reflects the distribution of a species within the local vegetation. These results have important implications for enhancing our understanding of the relationship between surface pollen assemblages and modern vegetation and climate.

Key words

surface pollen assemblages/environmental factors/vegetation cover/redundancy analysis/Tianshan Mountains

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基金项目

National Natural Science Foundation of China(42071102)

出版年

2023
干旱区科学
中国科学院新疆生态与地理研究所,科学出版社

干旱区科学

CSTPCDCSCD北大核心
影响因子：1.743
ISSN：1674-6767
参考文献量26
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