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学科主题: Marine & Freshwater Biology; Oceanography
题名: Using chemometrics to evaluate anthropogenic effects in Daya Bay, China
作者: Wu, ML ; Wang, YS
通讯作者: linlinmei_wu@163.com
关键词: Daya Bay ; principal component analysis ; water quality ; spatial and temporal patterns
刊名: ESTUARINE COASTAL AND SHELF SCIENCE
发表日期: 2007-01-01
卷: 72, 期:4, 页:732-742
收录类别: sci
部门归属: Chinese Acad Sci, Dept Marine Environm & Ecol, S Chian Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; Natl Field Stn Daya Bay Marine Ecol Syst, Shenzhen 518121, Peoples R China; Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
项目归属: LED
摘要: In this work, we have monitored 12 stations to study the effects caused by natural, marine and anthropogenic activities on water quality in Daya Bay, China. Results show that the N:P ratios are 71.54, 41.29, 81.50 and 98.27 in winter, spring, summer and autumn, respectively. Compared with the data of the past 20 years, the atomic N:P ratios have increased, indicating increased potential for P limitation; the atomic Si:N ratios have decreased; the nutrient structure has substantially changed over a period of 20 years. These findings show that the nutrient structure may be related to anthropogenic influence. The data matrix has been built according to the results, which were analyzed by principal component analysis (PCA). This analysis extracted the first four principal components (PC), explaining 73.58% of the total variance of the raw data. PC1 (25.53% of the variance) is associated with temperature, salinity and nitrate. PC2 (21.64% of the variance) is characterized by dissolved oxygen and silicate. PC3 (15.91% of the variance) participates mainly by nitrite (NO2-N) and ammonia (NH4-N). PC4 explaining 10.50% of the variance is mainly contributed by parameters of organic pollution (dissolved oxygen, 5-day biochemical oxygen demand and chemical oxygen demand). PCA has found the important factors that can describe the natural, marine and anthropogenic influences. Temperature and salinity are important indicators of natural and marine characters in this bay. The northeast monsoons from October to April and southwest monsoons from May to September have important effects on the waters in Daya Bay. It has been demonstrated that anthropogenic activities have significant influence on nitrogen form character. In spatial pattern, a marine aquaculture area and a non-aquaculture area are widely identified by the scores of stations. In seasonal pattern, dry and wet season characters have been demonstrated. (c) 2006 Elsevier Ltd. All rights reserved.
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/5891
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Wu, ML; Wang, YS.Using chemometrics to evaluate anthropogenic effects in Daya Bay, China,ESTUARINE COASTAL AND SHELF SCIENCE,2007,72(4):732-742
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