环境筛选和扩散限制对长江流域湖北段湿地植物群落构建的共同影响

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 环境筛选和扩散限制对长江流域湖北段湿地植物群落构建的共同影响 DOI: 10.5846/stxb202201110110 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 湖北省教育厅项目（T201701）；湖北省科技厅项目（2020CFA005）；国家自然科学基金项目（31570366） Environmental filtering and dispersal limitation jointly affect wetland plant community assembly in Hubei section of the Yangtze River Basin Author: Affiliation: Fund Project: Project of Department of Education of Hubei Province(T201701); Project of Department of Science and Technology of Hubei Province(2020CFA005);Project of National Natural Science Foundation of China(31570366) 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:湿地植物群落构建机制的研究可为湿地生态系统管理和受损湿地生态恢复与重建提供重要理论依据。地处长江流域的湖北省是我国湿地资源最为丰富的地区之一，通过野外调查研究了长江流域湖北段内不同类型湿地中的主要湿地植物群落类型，分析了研究区内湿地植物群落物种β多样性格局；利用相关性检验（Mantel test）方法和基于相似或相异度矩阵的多元回归模型（MRM）分析了环境差异和地理距离与湿地植物群落的物种相异性的相关性，及其对该区域湿地植物群落构建的相对贡献率。结果表明长江流域湖北段8个不同类型湿地内的湿地植物群落物种相异性指数差异显著，群落间物种相异性指数与地理距离和环境距离均呈显著正相关关系；MRM分析表明环境筛选和扩散限制共同解释了研究区内群落物种变异指数的54.72%；其中，环境距离独立解释率为22.03%，地理距离独立解释率为9.98%，二者联合解释率为22.71%。结果表明环境筛选和扩散限制共同影响了长江流域湖北段湿地植物群落构建过程，且环境筛选贡献更大。建议除了考虑空间尺度、环境因子、植被类型外，未来需进一步研究时间尺度及人类干扰等因子对该区域湿地植物群落构建的影响。 Abstract:Studies on the mechanism of wetland plant community assembly can provide an important theoretical basis for wetland ecosystem management and ecological restoration and reconstruction of the damaged wetlands. There are very abundant wetland resources in Hubei Province located in the Yangtze River Basin. In this study, we investigated main wetland plant communities by conducting the field survey and analyzed the β-diversity of wetland plant community in Hubei section of the Yangtze River Basin. The correlation between species dissimilarity of wetland plant communities and environmental distance and geographic distance, and relative contribution of environmental differences and geographic distance for accounting for community assembly were tested, using the Mantel test method and a multiple regression model based on similarity or dissimilarity matrices. The results showed that the species dissimilarity index of wetland plant communities in eight different types of wetlands in Hubei section of the Yangtze River Basin were significantly differed. The species dissimilarity indexes among wetland communities significantly were positively correlated with geographical distance and environmental differences. MRM analysis showed that environmental filtering and diffusion limitation together explained 54.72% of the community species variability index in the study area. The independent effects of the two tested hypotheses above mentioned were 22.03% and 9.98%, respectively. Our findings implied that the combined effects of environmental filtering and diffusion limitation decided wetland plant community assembly in Hubei section of the Yangtze River Basin, and in comparison to diffusion limitation, the environmental filtering had stronger effects. We argue that other factors, such as time scale and interference, should be considered in a study of wetland plant community assembly, beside spatial scale, environmental factors, and vegetation types. 参考文献 相似文献 引证文献