摘要
于2005年10月对香溪河干流5个小水电站对河流底栖动物的影响进行调查研究,按影响情况,各电站设5个采样点。应用底栖动物物种组成、现存量、优势类群、功能摄食类群等参数,衡量小水电站对河流底栖动物群落结构的影响。在研究区域共采集到底栖动物4656条,平均密度为658 ind./m2,蜉蝣目的四节蜉属(Baetisspp.)是该区域的优势类群。研究结果表明:电站的修建对河流水化学指标没有显著影响,但河流生境的物理因子(如流速和水深)都发生了较大的改变;对河流底栖动物的各方面均有一定的影响,特别是密度在5个样点间差异显著,而功能摄食类群中滤食者和捕食者的百分含量也有明显差异。另外,各项指标在5个样点间均有一致的变动趋势。相似性分析表明,坝下3号样点的群落组成差异最大,这意味着完全阻隔的坝不利于河流生物多样性的保护。
The influence of small hydropower plants （SHPs） on the spatial distribution of macroinvertebrate assemblages was investigated in five cascade SHPs along the Xiangxi River in October 2005. Five sites were sampled at each SHP. A total of 4656 macroinvertebrates belonging to 69 genera were collected. The characteristics of macroinvertebrate community structures were analyzed by using richness, abundance, dominant species and functional feeding groups. The results suggested that the construction of the SHPs had no significant impact on water chemistry, but physical variables （ such as current velocity and water depth） varied significantly among the five sites. All the characteristics of the macroinvertebrate community were more or less affected by the construction, especially the abundance, fiher-collecters percentage and predators percentage were significantly affected by the stations. The results also suggested that the sites beneath the dam had most different community structures, which indicates that diverting the water current completely is harmful to the protection of macroinvertebrate diversity of the river.
出处
《生态学报》
CAS
CSCD
北大核心
2008年第1期45-52,共8页
Acta Ecologica Sinica
基金
国家自然科学基金重点资助项目(30330140)
国家重点基础研究发展规划(973)资助项目(2002CB412300)~~
关键词
底栖动物
群落结构
引水型电站
香溪河
macroinvertebrate
community structure
small hydropower plant
Xiangxi River
