摘要
为研究太湖流经不同类型缓冲带的入湖河流水体氮污染特征,于2011年9 12月连续对流经4种不同类型缓冲带入湖河流沿程共32个样点进行采样,分析各样点的氮浓度及变化趋势.结果表明,流经农田型缓冲带入湖河流中总氮浓度由缓冲带外进入缓冲带内不断减小,到入湖河口处有轻微上升;流经养殖塘型、村落型缓冲带入湖河流中总氮浓度由缓冲带外进入缓冲带内变化不大,到接近入湖河口时浓度显著升高;流经生态型缓冲带入湖河流中各氮元素形态沿程不断降低.在流经4种类型湖泊缓冲带入湖河流中,流经农田型、养殖塘型和生态型缓冲带的入湖河流以硝态氮为氮元素的主要存在形态,而流经村落型缓冲带的入湖河流中硝态氮和铵态氮同为氮元素的主要存在形态.总氮浓度、铵态氮浓度与缓冲带类型均呈极显著正相关关系,外源污染排入对流经缓冲带的入湖河流中氮元素总量及形态产生较大影响.流经生态型缓冲带入湖河流净化效果最佳,总氮、硝态氮和铵态氮浓度削减率分别为60%、53%和61%.
In order to study the nitrogen pollution characteristics in rivers flowing through different lake buffer zones, thirty-two sites of four rivers flowing through the buffer zones of Lake Taihu were sampled and analyzed continuously from September to December in 2011. The results showed that total nitrogen ( TN ) reduced from outside to inside the buffer zones in rivers flowing through types of farmland, while appeared slight increase at lake estuary7. As far as both the river flowing through the pond type buffer zone and the river through the village type buffer, the TN concentrations had nearly no change along the flow direction from outside of buffer zone to the inside of buffer zone, except a significant increase in the lake estuary area. However, the concentrations of all kinds of nitrogen along the river in the lake which flows through the ecological type buffer was reduced gradually. Among rivers flowing through buffer strips of four different types, nitrate nitrogen( NO3 -N) was the dominant form of nitrogen element in types of farmland, aquaculture ponds and ecological, while NO3 -N and ammonium nitrogen ( NU^-N) were both the dominant forms of nitrogen element in type of village zone. Both TN and NU^-N showed significant positive correlation with the types of buffer zone. Pollution from these buffer zones discharged into rivers had a significant impact on the total amount and form of nitrogen. The ecological-type buffer zone has the best purification ability, with TN , NO3 -N and NU^-N concentration reduction rates were 6 0 / ,5 3 / and 6 1 / , respectively.
作者
胡小贞
耿荣妹
许秋瑾
蒋丽佳
林娜娜
HU Xiaozhen;GENG Rongmei;XU Qiujin;JIANG Lijia;LIN Nana(Lake Engineering Research Centre , Chinese Research Academy of Environmental Sciences, Beijing 100012, P.R.China)
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2016年第6期1194-1203,共10页
Journal of Lake Sciences
基金
国家水体污染控制与治理科技重大专项(2014ZX07510-001-01
2013ZX07101-014-04)资助
关键词
湖泊缓冲带
富营养化
太湖流域
氮污染
入湖河流
Lake buffer zones
type division
eutrophication
Taihu Basin
nitrogen pollution
inflow rivers
