中文关键词三峡库区梅溪河附石藻类群落组成环境因子 英文关键词Three Gorges ReservoirMeixi Riverepilithic algaecommunity compositionenvironmental factors

作者	单位	E-mail
米文梅	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	1349634825@qq.com
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
杨燕君	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
何书晗	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

中文摘要 为了解不同水文期三峡库区支流附石藻类与环境因子的关系，分别于丰水期（2016年8月）、枯水期（2016年11月）及平水期（2017年3月）这3个时期，对三峡库区支流梅溪河非回水区和回水区的26个采样点附石藻类进行采样并对其相关环境因子进行分析.结果表明，3个水情期，共鉴定出附石藻类5门47属106种（含变种）.其中，丰水期采集到73种，隶属5门38属，枯水期67种，隶属4门36属，平水期63种，隶属4门33属.丰水期、枯水期和平水期优势种分别为19种、17种和18种，丰水期的主要优势种属为曲壳藻属、束丝藻属和席藻属，枯水期为异极藻属、曲壳藻属和舟形藻属，而平水期为异极藻属、曲壳藻属和色球藻属.3个时期共有的优势种为扁圆卵形藻（Cocconeis placentula）、曲壳藻（Achnanthes sp.）、近棒形异极藻（Gomphonema subclavatum）、小型异极藻（G.parvulum）、小型舟形藻（Navicula parva）和缢缩异极藻（G.constrictum）.冗余（RDA）分析表明，回水区的附石藻类优势种相对丰度与电导率（Spc）、溶氧（DO）、pH、总磷（TP）和总氮（TN）的变化相关，而在非回水区，附石藻类优势种相对丰度主要与电导率（Spc）、pH、总磷（TP）、水温（WT）和流速（v）的变化有关.3个时期，影响附石藻类环境因子具有差异，然而，3个时期小型异极藻、缢缩异极藻和曲壳藻等优势种的相对丰度均与总磷呈负相关，与pH呈正相关.这些结果表明三峡库区不同水文期及水环境变化对附石藻类群落组成具有重要影响，导致群落结构发生变化. 英文摘要 To explore the relationship between the community of epilithic algae and environmental factors in tributaries of the Three Gorges Reservoir region, the epilithic algae and related environment factors were investigated from 26 sampling sites in Meixi River, a tributary of the Three Gorges Reservoir region, during flood period (August 2016), drought period (November 2016), and normal water period (March 2017). Results showed that 106 species (including varieties) belonging to 47 genera and 5 families were identified from 26 sampling sites during the three periods. Among these, 73 species belonged to 38 genera and 5 families in the flood period, 67 species belonged to 36 genera and 4 families in the drought period, and 63 species belonged to 33 genera and 4 families in the normal water period. Nineteen, 17, and 18 dominant species were identified during the flood period, drought period, and normal water period, respectively. The main dominant species were Achnanthes sp., Aphanizomenon sp., and Phormidium sp. in the flood period; Achnanthes sp., Gomphonema sp., and Microcystis sp. in the drought period; and Gomphonema sp., Nitzschia sp., and Chroococcus sp. in the normal water period. Moreover, species such as Cocconeis placentula, Achnanthes sp., Gomphonema subclavatum, G. parvulum, Navicula parva, and G. constrictum were determined to be the common dominant species during the three periods. Redundancy analysis revealed that the changes in the relative abundance of dominant species in the backwater sections were significantly related to the electrical conductivity, dissolved oxygen, pH, total phosphorus, and total nitrogen, and the relative abundance of dominant species in the natural sections was mainly related to the electrical conductivity, pH, total phosphorus, temperature, and velocity. Moreover, a different relationship with the environmental factors was determined among the three periods. However, a negative correlation between total phosphorus and the relative abundances in G. parvulum, G. constrictum, and Achnanthes sp. and a positive correlation between pH and the relative abundances in G. parvulum, G. constrictum, and Achnanthes sp. were found during the three periods. These results indicated that the differences in the hydrological regime and environmental factors in the Three Gorges Reservoir played an important role on the composition of epilithic algae community and led to a significant change in the community structure of epilithic algae.

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