摘要
为评价分析流域治理对水质的影响 ,于 2 0 0 0年丰水期和枯水期调查了高州水库 (石骨库区 )营养状态及浮游生物分布 ,并与历史资料进行比较分析 .从 2 0 0 0年的数据来看 ,水库营养水平属于寡中营养型 ;丰水期的营养水平、浮游植物丰度及Chla含量均高于枯水期 ,丰水期以蓝藻、绿藻和硅藻为主要优势种 ,而枯水期主要为蓝藻 .浮游动物丰度枯水期远高于丰水期 ,以桡足类的广布中剑水蚤 (Mesocyclopsleuckarti)、无节幼体、桡足幼体以及枝角类的角突网纹溞 (Ceriodaphniacornuta)和长额象鼻溞 (Bosminalongirostris)为主 .与 1988年的数据相比 ,总磷含量大幅度下降( 0 .0 2 1～ 0 .0 0 6mgL- 1 ) ,尽管总氮含量呈上升趋势 ( 0 .40 5～ 0 .82 0mgL- 1 ) ,但总的营养水平有所下降 ,浮游生物种类与丰度发生了较大变化 .浮游植物种类组成由蓝藻占绝对优势演变为以蓝藻、绿藻和硅藻为主要优势种 ,浮游动物则由桡足类和枝角类取代原生动物和轮虫 ,成为主要的优势种群 .浮游植物和浮游动物丰度均大幅度下降 .说明经过近十年的流域治理 ,水库水质得到一定的改善 .图 3表 4参
The trophic state and plankton distribution were investigated in Gaozhou Reservoir (South China) in flood and dry seasons of 2000 and compared with the data collected ten years ago. It was oligo-mesotrophic, with higher trophic state in flood season than that in dry season. Zooplankton abundance was much higher in dry season than that in flood season and primarily predominated by copepod (Mesocyclops leuckarti, nauplii and copedid) and cladoceran (Ceriodaphnia cornuta and Bosmina longirostris). Phytoplankton abundance and chlorophyll-a concentration was higher in flood season than that in dry season and predominated numerically by Cyanophyta, Chlorophyta and Bacillariophyta. However, Cyanophyta predominated primarily in dry season. Total phosphorous concentration dropped dramatically from 0.021 mg L -1 in 1988 to 0.006 mg L -1 in 2000, while total nitrogen concentration rose from 0.405 mg L -1 to 0.820 mg L -1. As a result, the trophic level was a little lower than that ten years ago and the species composition and the abundance of plankton changed greatly. Phytoplankton was absolutely predominated by Cyanophyta in 1988 and then Cyanophyta, Chlorophyta and Bacillariophyta in 2000. Microzooplankton (rotifer and protozoa) numerically predominated in 1988 and was replaced by macrozooplankton (copepod and cladoceran) in 2000. The comparison analysis showed that the reservoir water quality was improved after twelve years watershed management. Fig 3, Tab 4, Ref 19
出处
《应用与环境生物学报》
CAS
CSCD
2002年第2期165-170,共6页
Chinese Journal of Applied and Environmental Biology
基金
教育部骨干教师基金
广东省科技攻关 (2KM0 61 0 3S)
国家自然科学基金 (3990 0 0 2 2 )
广东省水利厅等资助~~
