摘要
三峡水库成库后,对三峡水库13条主要支流回水区有机物、营养盐、生物量含量季节变化进行了初步研究.结果表明,支流高锰酸盐指数、化学耗氧量(COD)、总氮(TN)、氨氮(NH4+-N)、总磷(TP)、叶绿素a(Chl-a)含量季节间差异较大.高锰酸盐指数范围为0.20～9.61 mg.L-1,COD含量范围4.58～42.0 mg.L-1,TN含量范围为0.601～10.1 mg.L-1,NH4+-N含量范围0.044～6.82 mg.L-1,TP含量范围为0.011～0.756 mg.L-1,Chl-a值范围为2.0～161 mg.m-3.支流回水区受到不同程度污染,水体中N含量丰富,部分支流富营养化的限制因子为P.双因子方差分析表明,营养因子在时间、空间分布上均有不同程度差异.回水区Chl-a含量高于上游区,季节分布有丰水期>平水期>枯水期.Chl-a与COD、高锰酸盐指数、TN、TP呈显著正相关关系.利用综合营养状态指数法评价了回水区富营养化程度,综合营养指数范围在35～72,所有支流达到中营养以上水平,不同季节营养状态表现为丰水期>平水期>枯水期.支流回水区富营养化程度较成库前严重,该区域水体富营养化应引起重视.
After the Three Gorges Reservoir was storage water in June 2003, organic contamination, nutrient and biomass were determined in backwater areas of 13 tributaries in three seasons. Potassium permanganate index, chemical oxygen demand （COD）, total nitrogen （TN）, ammonia nitrogen （NH4^＋ -N）,total phosphorus （TP） and chlorophyll a （Chl-a） value are 0.20-9.61 mg·L^-1, 4.58-42.0 mg·L^-1, 0.601- 10.1 mg·L^-1, 0.044-6.82 mg·L^-1, 0.011-0.756 mg·L^-1 and 2.0-161 mg·m^-3 respectively. The water body of tributaries is polluted at various levels. The concentration of TN is abundant. The rate of TN and TP showed that a part of tributaries eutrophication are limited by TP. Utilizing the method of between-subjects effects tests, it is indicated that spatial and seasonal distribution of nutrient factors is different in diverse seasons. Cbl-a value of backwater areas of tributaries is usually beyond upstream and concentration of Chl-a in flood season is higher than that in normal and dry season. There was a significant positive correlation between Chl-a, nutrient and organic contamination. Utilizing the method of integrated nutrition state index, it assessed the trophic states degree of the studied area. The integrated nutrition state index ranged 35-72. All of the studied tributaries are beyond mesotropher. The degree of eutrophication in flood season is higher than that in normal and dry season. The degree of eutrophication is more serious than that before the Three Gorges Reservoir impoundment. The problem of eutrophication in tributaries of Three Gorges Area should be noticed.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第1期64-69,共6页
Environmental Science
基金
重庆市自然科学基金项目(2007BB7241,2007BB7242)
重庆市建委项目(2007-54,2007-56)
关键词
三峡水库
支流
营养状态
季节变化
Three Gorges Reservoir
tributary
trophic state
seasonal variation
