生物多样性 ›› 2024, Vol. 32 ›› Issue (2): 23194.  DOI: 10.17520/biods.2023194

• 研究报告: 植物多样性 •    下一篇

中国芦苇沼泽植物物种丰富度分布格局及其驱动因素

孟敬慈2,1(), 王国栋1,*(), 曹光兰3,4,*(), 胡楠林1, 赵美玲1, 赵延彤1, 薛振山1, 刘波1, 朴文华3, 姜明1   

  1. 1.中国科学院东北地理与农业生态研究所湿地生态与环境重点实验室, 长春 130102
    2.延边大学融合学院, 吉林延吉 133002
    3.延边大学地理与海洋科学学院, 吉林延吉 133002
    4.南开大学环境科学与工程学院, 天津 300350
  • 收稿日期:2023-06-09 接受日期:2023-11-24 出版日期:2024-02-20 发布日期:2024-03-01
  • 通讯作者: E-mail: wanggd@iga.ac.cn; guanglancao@ybu.edu.cn
  • 基金资助:
    国家重点研发计划(2022YFF1301000);国家自然科学基金(U23A2004);国家自然科学基金(42077070);国家自然科学基金(U19A2042);国家科技基础性工作专项(2013FY111800)

Patterns and drivers of plant species richness in Phragmites australis marshes in China

Meng Jingci2,1(), Wang Guodong1,*(), Cao Guanglan3,4,*(), Hu Nanlin1, Zhao Meiling1, Zhao Yantong1, Xue Zhenshan1, Liu Bo1, Piao Wenhua3, Jiang Ming1   

  1. 1 Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102
    2 College of Integration Science, Yanbian University, Yanji, Jilin 133002
    3 College of Geography and Ocean Science, Yanbian University, Yanji, Jilin 133002
    4 College of Environmental Science and Engineering, Nankai University, Tianjin 300350
  • Received:2023-06-09 Accepted:2023-11-24 Online:2024-02-20 Published:2024-03-01
  • Contact: E-mail: wanggd@iga.ac.cn; guanglancao@ybu.edu.cn

摘要:

明确大尺度物种丰富度的分布格局及其影响因素一直是生态学及生物地理学领域的核心议题之一, 其对于预测全球环境变化背景下生物多样性的响应和制定减少生物多样性丧失的保护方案有着重要意义。本文基于全国芦苇(Phragmites australis)沼泽野外调查数据, 结合气候、地理、土壤等环境因子, 探讨了中国芦苇沼泽植物物种丰富度的分布格局及其驱动机制。结果表明: (1)中国的芦苇沼泽植物物种丰富度总体表现为亚热带湿润区和温带湿润半湿润区较高, 青藏高原区、温带干旱半干旱区和滨海区较低的特点; (2)芦苇沼泽植物物种丰富度与年降水、土壤有机碳、土壤总氮、纬度均呈显著正相关, 而与年均温、最冷月最低温、土壤pH值、海拔之间表现为显著负相关; (3)土壤因子特别是土壤pH值是影响芦苇沼泽植物物种丰富度的最主要因素, 其次分别为淹水状况、气候因子和地理因子; (4)结构方程模型结果表明土壤因子、淹水状况和气候因子直接影响植物物种丰富度, 而地理因子通过调控土壤因子、淹水状况与气候因子间接影响植物物种丰富度。总体而言, 中国芦苇沼泽植物物种丰富度具有空间异质性, 其分布格局受到多种因素的共同影响, 土壤因子是影响植物物种丰富度分布格局的关键环境因素。

关键词: 物种丰富度, 芦苇沼泽, 分布格局, 土壤因子

Abstract

Aims Determining the distribution pattern and drivers of broad-scale species richness is significant for predicting the response to biodiversity and formulating conservation programs to reduce biodiversity loss. This paper discusses the distribution pattern and driving mechanism of plant species richness obtained from nationwide field survey of Phragmites australis marsh data, combined with climate, geography, soil, and other environmental factors.

Method Initially, we used correlation analysis and general linear model to determine the relationship between species richness and annual mean temperature (MAT), annual precipitation, minimum temperature of coldest month (MTCM), altitude, latitude, longitude, soil pH, soil organic carbon (SOC), soil total nitrogen (TN), and topographic wetness index (TWI). Then, we used hierarchical partitioning to determine the most important drivers of species richness utilizing the following nine variables: soil factors (soil pH, SOC, TN), climate factors (MAT, annual precipitation, MTCM), geography factors (latitude, altitude), and water regime. Finally, piecewise structural equation modeling was used to assess the direct and indirect effects of these nine variables on plant species richness.

Results (1) The overall richness of plant species in Chinese P. australis marshes was (a) higher in the subtropical humid zone, temperate humid and semi-humid zone, and (b) lower in the Tibetan Plateau region, temperate arid and semi-arid zone, and coastal region. (2) The richness of plant species in P. australis marshes was significantly positively correlated with annual precipitation, SOC, TN, and latitude, but negatively correlated with the MAT, MTCM, soil pH, and altitude. (3) Soil factors, especially soil pH, were the most important factors affecting the richness of plant species in P. australis marshes, followed by water regime, climate factors, and geography factors. (4) Piecewise structural equation modeling showed that soil factors, water regime, and climate factors directly affected the richness of plant species, while geography factors indirectly affected the species richness of plants by regulating soil factors, water regime, and climate factors.

Conclusion Species richness of plants in Chinese P. australis marshes is spatially heterogeneous between the different regions. The species richness distribution pattern is affected by a combination of factors, where soil factors are the key environmental factors affecting the species richness pattern of plants. This study provides a new understanding of the broad-scale distribution pattern of plant diversity and the pattern’s conservation in P. australis marshes.

Key words: species richness, Phragmites australis marshes, distribution pattern, soil factors