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引用本文:张晟,宋丹,张可,曾凡海,李斗果.三峡水库典型支流上游区和回水区营养状态分析.湖泊科学,2010,22(2):201-207. DOI:10.18307/2010.0208
ZHANG Sheng,SONG Dan,ZHANG Ke,ZENG Fanhai,LI Douguo.Trophic status analysis of the upper stream and backwater area in typical tributaries Three Gorges Reservoir. J. Lake Sci.2010,22(2):201-207. DOI:10.18307/2010.0208
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三峡水库典型支流上游区和回水区营养状态分析
张晟1,2, 宋丹1,2, 张可1, 曾凡海3, 李斗果1
1.重庆市环境科学研究院, 重庆 401147;2.西南大学资源环境学院, 重庆 400716;3.重庆市涪陵区环境监测站, 重庆 408000
摘要:
2006年3、5、8月,对三峡水库成库后5条支流的上游区和回水区水质参数及营养因子分布进行了初步研究.研究结果表明,支流高锰酸盐指数范围在1.00-2.50mg/L、COD范围为6.00-26.5mg/L,上游区与回水区有机物含量差异不大,支流目前未受到有机物污染影响.NH4+-N范围为0.039-0.367mg/L,各支流含量均为丰水期最大.TN范围在0.58-1.67mg/L,TP范围在0.005-0.133mg/L,支流回水区TN和TP含量均远高于水体发生富营养化的最低限制值,水体存在发生富营养化的风险.大多支流N/P比值处于适宜藻类生长范围.Chl.a浓度范围为0.94-28.9mg/m3,各支流回水区Chl.a浓度均为5月最大河流回水区Chl.a浓度高于上游区,上游区、回水区Chl.a含量有显著差异.选用修正的Carlson营养状态指数(Trophic State Index)TSIM法,评价了支流水体营养状态,TSIM指数范围在36.0-64.2,上游区除龙河、澎溪河5月达到富营养水平外,其余支流均为贫-中营养水平.回水区各支流均达到中-富营养水平.支流回水区营养状态指数均高于上游区,但各支流增加幅度不同.支流回水区水体营养状态明显受三峡水库蓄水水体流速减缓的影响.Chl.a与COD(n=15,P<0.01)呈极显著正相关,与其它营养因子无明显相关关系.三峡水库完工后,支流回水区水体流速减缓,富营养化趋势可能加重.
关键词:  三峡水库  支流  回水区  营养状态
DOI:10.18307/2010.0208
分类号:
基金项目:国家重大水专项项目(2009ZX07104-003)资助
Trophic status analysis of the upper stream and backwater area in typical tributaries Three Gorges Reservoir
ZHANG Sheng1,2, SONG Dan1,2, ZHANG Ke1, ZENG Fanhai3, LI Douguo1
1.Chongqing Academy of Environmental Science,Chongqing 401147,P.R.China;2.College of Resource and Environment,Southwest University,Chongqing 400716,P.R.China;3.Fuling District Environmental Monitoring Station of Chongqing,Chongqing 408000,P.R.China
Abstract:
Through sampling and analyzing in 5 typical tributaries of Three Gorges Reservoir, parameters of the water quality andmain nutrients were monitored in Mar.,May and Aug. of 2006. The variation of permenganate index of oxygen demand and CODranged from 1.00-2.50mg/L and 6.00-26.5mg/L respectively. Concentration of organic contamination was not discrepancy inupstream and backwater areas. Values of ammonia nitrogen(NH+-N),total nitrogen(TN)and total phosphorus(TP) were0.039-0.367mg/I.0.58-1.67mg/L and 0.005-0.133mg/L, respectively. Concentration of NH+-N in Aug.was higherthan thoses in Mar. and May, when concentrations of TN and fP were largely exceed the minimum limited value of eutrophic state.The ratio of TN and TP were favored well for algae growth in nearly all tributaries. Chl. a ranged from 0.94-28.9mg/m3.Chl.avalues in backwater areas of tributaries were exceed upstream and the concentration of Chl.a in May was higher than in Mar. andAug.Utilizing the method of modified Carlson trophic state index(TSI M)has assessed the trophic; states of the studied area. Thevalues of TSIM ranged from 36.0-64.2,showing that the trophic state of upstream area was oligotropher to mesotropher and thebackwater areas were mesotropher to eutropher. Trophic state of backwater areas were poorer than upstream, and was affected byimpoundment of the Three Gorges Reservoir.There was a significant positive correlation between Chl. a and COD, but Chl.a was not significant correlation with other nutrient factors. After the Three Gorges Reservoir was completed in 2009,eutrophic trend oftributaries in backwater areas would be more serious with the decrease of flow velocity.
Key words:  ThreeReservoir  tributary  backwater areas  trophic state
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