摘要
以2008年3～9月对库区次级河流临江河回水区水质的调查为依据,分析了临江河回水区氮、磷营养盐的污染分布及富营养化特征。结果表明,临江河回水区氨氮（NH3-N）、总氮（TN）的浓度在7月中旬达到最小值,分别为1.963和5.128 mg/L,之后在9月初出现峰值,而磷酸盐（PO43--P）和总磷（TP）的浓度却呈现出先增加后下降的变化规律;氮主要来自点源污染,而磷受面源污染影响较大;溶解性无机氮（D IN）和PO43--P是TN与TP的主要存在形态,平均分别占TN和TP的85.3%和77.8%,而D IN又以NH3-N为主。营养盐浓度呈现出回水区中游最高,回水末端次之,河口处最低的空间分布特征。叶绿素a（Chl-a）的浓度在4月和9月出现峰值,其空间分布特征与营养盐的类似。研究表明,临江河回水区在重度污染的情况下,即便是河流型水体也可能发生富营养化;流速对Chl-a浓度的显著影响呈指数关系。
Based on the survey of water quality conducted between March and September in 2008,the pollution and distribution characters of nitrogen,phosphorus in the backwater region of the Linjiang River in the Three Gorges Reservoir and its eutrophication features were studied.The results showed that NH3-N and TN exhibited the minimum concentrations of 1.963 and 5.128 mg/L respectively in the middle of July,and the peak values in early September;but PO3-4-P and TP showed an increasing trend until early September; nitrogen was mainly caused by point source pollution, while phosphorus primarily by non-point source pollution; DIN （dominated by NH3-N） ,po34- -P were the dominant forms of TN and TP respectively, accounting for 85.3% and 77.8% of TN and TP on average. The maximum concentrations of nutrients occurred in the middle reach of the backwater region, followed by that of the inlet, and ranked last at the estuary. Meanwhile, Chl-a showed the peak values both in April and September, and a similar spatial distribution with that of nutrient. Also, the study indica- ted that, under the severe contamination conditions, the eutrophication can take place even in the water body labeled by river pattern; the flow velocity has shown a significant effect on Chl-a with an exponential relationship in the backwater region of the Lingjiang River.
出处
《环境工程学报》
CAS
CSCD
北大核心
2009年第12期2175-2180,共6页
Chinese Journal of Environmental Engineering
基金
科技部国际合作项目(2007DFA90660)
重庆市科技攻关计划项目(CSTC
2006AB7020)
重庆市重大科技攻关项目(CSTC
2006AA7003)
重庆市自然科学基金项目(CSTC
2008BB7305)
关键词
临江河回水区
营养盐
污染特征
分布特征
富营养化
backwater region of the Linjiang River
nutrients
pollution features
distribution features
eutrophication
