| 环境筛选驱动雅鲁藏布江下游着生藻类群落组装过程 |
| 摘要点击 923 全文点击 142 投稿时间：2024-02-27 修订日期：2024-04-26 |
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| 中文关键词 着生藻类 群落组装 环境筛选 中性模型 共现网络 雅鲁藏布江 |
| 英文关键词 periphytic algae community assembly environment screening neutral model co-occurrence networks Yarlung Zangbo River |
| 作者 | 单位 | E-mail | | 刘惠秋 | 西藏大学麦地卡自治区级湿地生态系统定位观测研究站, 那曲 852000
西藏大学地球第三极碳中和研究中心, 拉萨 850000
西藏大学生态环境学院青藏高原湿地与流域生态系统实验室, 拉萨 850000 | liuhuiqiuer@163.com | | 杨胜娴 | 西藏大学麦地卡自治区级湿地生态系统定位观测研究站, 那曲 852000
西藏大学地球第三极碳中和研究中心, 拉萨 850000
西藏大学生态环境学院青藏高原湿地与流域生态系统实验室, 拉萨 850000 | | | 巢欣 | 西藏大学麦地卡自治区级湿地生态系统定位观测研究站, 那曲 852000
西藏大学地球第三极碳中和研究中心, 拉萨 850000
西藏大学生态环境学院青藏高原湿地与流域生态系统实验室, 拉萨 850000 | | | 闫冰洁 | 西藏大学麦地卡自治区级湿地生态系统定位观测研究站, 那曲 852000
西藏大学地球第三极碳中和研究中心, 拉萨 850000
西藏大学生态环境学院青藏高原湿地与流域生态系统实验室, 拉萨 850000 | | | 卫佩佩 | 西藏大学麦地卡自治区级湿地生态系统定位观测研究站, 那曲 852000
西藏大学地球第三极碳中和研究中心, 拉萨 850000
西藏大学生态环境学院青藏高原湿地与流域生态系统实验室, 拉萨 850000 | | | 吴湘君 | 西藏大学麦地卡自治区级湿地生态系统定位观测研究站, 那曲 852000
西藏大学地球第三极碳中和研究中心, 拉萨 850000
西藏大学生态环境学院青藏高原湿地与流域生态系统实验室, 拉萨 850000 | | | 巴桑 | 西藏大学麦地卡自治区级湿地生态系统定位观测研究站, 那曲 852000
西藏大学地球第三极碳中和研究中心, 拉萨 850000
西藏大学生态环境学院青藏高原湿地与流域生态系统实验室, 拉萨 850000 | basang2003@utibet.edu.cn |
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| 中文摘要 |
| 着生藻类是河流生态系统中重要的初级生产者,也是河流水生态监测与评价的重要指标之一. 雅鲁藏布江作为典型的高原河流,其着生藻类的群落组装过程尚不清楚. 于2022年5月、2023年7月和9月在雅鲁藏布江下游进行着生藻类样品的采集和水环境因子的测定,采用活体观察与固定染色技术鉴定藻类物种并计算细胞丰度及生物量,以探究雅鲁藏布江下游着生藻类的群落多样性格局,阐明确定性过程与随机过程在着生藻类群落组装中的相对重要性,并揭示驱动其组装过程的影响因子. 结果表明,水环境因子在时间上差异明显,主要集中于春夏和夏秋之间；3个季节共鉴定着生藻类274种,隶属于7门9纲18目31科63属,季节间群落差异显著（P=0.001）,整体呈现硅藻-绿藻-蓝藻型；着生藻类的群落组装过程受确定性过程和随机性过程共同影响,但以确定性过程为主导；种间关系以协作为主且秋季的共现网络表现出更强的网络复杂性和联通性；pH和浊度是影响着生藻类群落结构的重要水环境因子,可通过驱动着生藻类物种的代谢速率及生态适应性间接影响着生藻类的群落组装过程. |
| 英文摘要 |
| Periphytic algae is an important primary producer in the river ecosystem, and it is one of the important indicators for the monitoring and evaluation of river water ecology. As a typical plateau river, the assembly process of the algae community in the Yarlung Zangbo River is still unclear. In May 2022 and July and September 2023, algae samples were collected, and water environmental factors were determined in the lower reaches of the Yarlung Zangbo River. The algal species were identified, and cell abundance and biomass were calculated using in vivo observation and fixed staining techniques to explore the diversity pattern of algae communities in the lower reaches of the Yarlung Zangbo River, to clarify the relative importance of deterministic and random processes in the assembly of algal communities, and to reveal the influencing factors driving the assembly process. The results showed that there were significant differences in the time of water environmental factors, mainly concentrated between spring, summer, summer, and autumn. A total of 274 species of algae were identified in the three seasons, belonging to 7 phyla, 9 classes, 18 orders, 31 families, and 63 genera, and the community differences between seasons were significant （P=0.001）. They all showed Bacillariophyta-Chlorophyta-Cyanophyta, and the community assembly process of algae was affected by both a deterministic process and random process but was dominated by the deterministic process. The interspecific relationship was mainly cooperative, and the co-occurrence network in autumn showed stronger network complexity and connectivity. The pH and turbidity were important water environmental factors affecting the community structure of algae, which could indirectly affect the community assembly process of algae by driving the metabolic rate and ecological adaptability of algae species. |
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