| 环境异质性对三峡库区支流香溪河附石硅藻群落的影响及驱动作用 |
| 摘要点击 2474 全文点击 2692 投稿时间：2022-06-09 修订日期：2022-06-27 |
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| 中文关键词 环境异质性 附石硅藻 功能多样性 分类多样性 功能性状 |
| 英文关键词 environmental heterogeneity epilithic diatom functional diversity taxonomic diversity functional trait |
| 作者 | 单位 | E-mail | | 纪璐璐 | 西南大学三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | 1986689003@qq.com | | 赵璐 | 西南大学三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | | | 欧阳添 | 西南大学三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | | | 杨宋琪 | 西南大学三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | sqyang@hxu.edu.cn | | 郑保海 | 西南大学三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | | | 杜雨欣 | 西南大学三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | | | 李玉鑫 | 西南大学三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | | | 李佳欣 | 西南大学三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | | | 施军琼 | 西南大学三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | | | 吴忠兴 | 西南大学三峡库区生态环境教育部重点实验室, 重庆市三峡库区植物生态与资源重点实验室, 重庆 400715 | wuzhx@swu.edu.cn |
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| 中文摘要 |
| 环境异质性在一定程度上不仅可以增加物种多样性，而且影响了陆生生物群落的稳定性.然而，环境异质性如何影响水生态系统附石硅藻群落的物种多样性却较少报道.因此，以三峡库区支流香溪河的附石硅藻为研究对象，通过量化和比较香溪河在时间尺度上的环境异质性，探究其在驱动物种多样性变化的作用.结果表明，环境异质性、分类β-多样性和功能β-多样性均表现为非蓄水期显著高于蓄水期，且周转组分均对不同水文期β-多样性贡献较大，而分类α-多样性则是蓄水期显著高于非蓄水期.此外，功能α-多样性中除功能丰富度非蓄水期显著高于蓄水期外，功能均匀度和功能分散度均无显著差异.基于相似或相异度矩阵的多元回归（MRM）分析表明，NH4+-N和SiO32--Si是影响非蓄水期香溪河附石硅藻群落的关键环境异质因子，而影响蓄水期香溪河附石硅藻群落的关键环境异质因子为NH4+-N、SiO32--Si和TP.这表明三峡库区不同水文期的环境异质性显著影响附石硅藻的群落结构，导致群落内物种发生分化，影响了水生生态系统稳定性. |
| 英文摘要 |
| Environmental heterogeneity can not only increase species diversity to some extent but also affect the stability of terrestrial communities. However, how environmental heterogeneity affects species diversity of epilithic diatom communities in aquatic ecosystems is rarely reported. In this study, therefore, epilithic diatoms and their roles in driving species diversity were explored by quantifying and comparing the environmental heterogeneity in Xiangxi River, a tributary of the Three Gorges Reservoir Area (TGR), on a time scale. The results showed that environmental heterogeneity, taxonomic β-diversity, and functional β-diversity in non-impoundment periods were significantly higher than those in impoundment periods. Moreover, the turnover components in the two hydrological periods showed the highest contribution to β-diversity. However, the taxonomic α-diversity in impoundment periods was significantly higher than that in non-impoundment periods. In addition, functional richness in functional α-diversity was significantly higher in non-impoundment periods than that in impoundment periods, whereas there was no significant difference in other functional α-diversity, i.e., functional dispersion and functional evenness, found between the two periods. Multiple regression on (dis)similarity matrices (MRM) analysis indicated that ammonium nitrogen (NH4+-N) and silicate (SiO32--Si) were the key environmental heterogeneous factors affecting the epilithic diatom community in Xiangxi River during the non-impoundment periods, whereas the key heterogeneous factors were ammonium nitrogen (NH4+-N), silicate (SiO32--Si), and total phosphorus (TP) during the impoundment periods. These results suggested that the environmental heterogeneity during different hydrological periods in TGR can significantly affect the community structure of epilithic diatoms, resulting in the differentiation of species within the community and even affecting the stability of aquatic ecosystems. |
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