长江源与澜沧江源区浮游植物组成与分布特性研究

摘要

Phytoplankton in the waters of the source regions of the Yangtze River and Lancang River was investiga-ted in the summer of 2012. Altogether 29 species of phytoplankton were identified, consisting of diatom (17 species accounting for 54.83% of the total), green algae (7 species accounting for 24.14% of the total), blue-green algae (3 species), Cryptomonas (1 species) and Pyrroptata (1 species). The phytoplankton abundance at each sampling site was very low, only (9.14~13.60) ×104/L. There was no apparent difference of assemblages and abundance of phytoplankton between the source regions of the Yangtze River and the Lancang River. The results are close to the investigation results by Changjiang Water Resources Commission in 2010. The results show that the ecological envi-ronmental condition in the source regions is good in general and further researches in this aspect are of vital signifi-cance.%2012年夏季，长江科学院组织了江源科学考察团，对长江源和澜沧江源区的水体浮游植物进行了系统的采样调查，本次调查共鉴定出浮游植物29种，其中硅藻门17种，占种类数的54.83%，其次是绿藻门，共检测出7种，占种类数的24.14%；蓝藻门3种，隐藻门1种，甲藻门1种。各个采样位点的浮游植物密度均相对较低(密度范围为(9.14~13.60)×104个/L)。本次调查的长江源和澜沧江源区水体浮游植物的种类和密度没有明显差别，研究结果与2010年长江水利委员会组织的江源科学考察结果相接近。研究结果显示，目前江源地区水生态环境整体状况良好，继续深入开展江源地区生态环境状况研究对于江源区的生态环境保护与修复具有十分重要的意义。