摘要
采用箱线图法,相关系数法,小波分析及样条插值研究了渤海湾氮、磷监测值的分布态势,相关性,氮磷比及时空分布规律性.结果表明:渤海湾11年来22个监测站点33次DIN、DIP监测值总体呈现正偏态分布,异常值大多集中于1、2、4、6#监测站点,其平均DIN、DIP含量为其它站点的2倍,陆源污染对渤海湾DIN、DIP的影响不容忽视.33次DIN、DIP监测值相关分析结果表明,丰、平及枯水期监测站点DIN、DIP的相关性大小顺序为丰水期〉平水期〉枯水期.渤海湾氮、磷比值表明,近来年,渤海湾营养盐类型为限磷型.时空分析结果表明,在时间上,渤海湾DIN表现出上升的"S"形趋势,而DIP的趋势性不强;在空间上,渤海湾DIN、DIP监测值的空间分布趋势相似,都表现为自近海向海盆,自北向南逐渐降低的趋势.
The Box-plots method,correlation coefficient analysis,wavelet analysis and spline interpolation algorithm were used to study the spatio-temporal variation of nitrogen and phosphorus and their concentration ratio and distribution trend in the Bohai Bay in recent 11 years.The results show that the distributions of DIN and DIP in 22 monitoring sites are mostly positively skewed.The DIN and DIP concentrations at the 1,2,4 and 6 monitoring sites have more outliers than others.The mean contents of DIN and DIP in these sites are 2 times higher than others.This indicates that the DIN and DIP pollution from land-based sources are important. For the temporal variation,correlation analysis of the DIN and DIP concentrations at low-flow period,high-flow period and mean-flow period showed that,the correlation coefficiency showed the trend of.high-flow periodmean-flow periodclow-flow period.The concentration ratio of nitrogen and phosphorus shows that phosphorus is the controlling factor of the nutritive salts at Bohai Bay during recent years.For temporal variation,the DIN concentration showed an S-shape temporal variation,while there is no strong trend of DIP concentration. For the spatial distribution,the concentrations of nitrogen and phosphorus show similar trend,decreasing from near-shore to off-shore and from north to south.
出处
《南开大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第5期8-14,共7页
Acta Scientiarum Naturalium Universitatis Nankaiensis
基金
科技部科研院所技术开发研究专项基金(2008EG124218)
中央级公益性科研院所基本业务费专项资金(TKS070206)
交通部天津水运工程科学研究所科技开发基金(TKS07020203)
关键词
渤海湾
时空变化
氮
磷
Bohai bay
spatio-temporal variation
nitrogen
phosphorus
