太原汾河蓄水区浮游藻类细胞密度对一些环境因子的响应

2012年6月至10月,对太原汾河景区8个采样点的浮游藻类细胞密度及气温、水温、DO、COD Cr和COD Mn等指标及它们之间的关系进行了调查分析。结果表明:(1)浮游藻类细胞密度以7月份较高,各点变化幅度和高峰出现时间不同,下游端较上游端浮游藻类生长旺盛;(2)各采样点6~8月份温度较高,9月初开始明显下降。DO、COD Cr和COD Mn的变化反映出8月份时,多数样点水体污染相对较重;(3)多数样点浮游藻类细胞密度与气温、水温、COD Cr和COD Mn呈正相关,而与DO呈负相关。总体分析,温度和COD Cr的变化与浮游藻类细胞密度关系更密切。针对太原汾河蓄水区的水质现状,必须采取一些相应的措施,加强对其水质的保护和生态系统的恢复。

Relationship between Phytoplankton Cell Density and Some Physicochemical Factors in Taiyuan Fenhe Impounding Regions

From June to October in 2012, the phytoplankton cell density and some physicochemical factors were investigated in Taiyuan Fenhe impounding regions, involving 8 sampling sites, meanwhile, the relationship between them were analysis. The results indicate that (1) the phytoplankton cell density was relatively high in July and it was diverse at different sampling sites, moreover, the phytoplankton was more in downstream than in upstream; (2) the temperature was relatively high during June to August, declined obviously in the early of September. The variation of DO, CODCr and CODMn showed that water is heavily polluted in August; (3) the phytoplankton cell density in most sampling sites were positively associated with air and water temperature as well as CODCr and CODMn, yet with a negative correlation of DO. At whole, the change of temperature and CODCr had a close relationship with phytoplankton cell density. Aimed at the current water quality of Taiyuan Fenhe impounding regions, some measures should be taken in order to protect water quality and restore ecosystem.