摘要
以辰山植物园景观湖为研究对象,研究了景观湖建成初期沉水植物群落构建对水体水质因子的影响;并应用相关性分析(correlation analysis)和主成分分析(principal components analysis)对各水质和生态因子之间的相互关系进行了研究。结果表明,景观湖沉水植被建成1年后,水体水质处于Ⅲ类,其中叶绿素a含量5.48±1.930μg/L、总氮1.40±0.136mg/L、总磷0.080±0.015 mg/L、透明度108±20 cm、高锰酸盐指数5.50±1.26 mg/L;除高锰酸盐指数(CODMn)外,其他水质指标均较构建前有显著改善;并且景观湖水质显著优于外河道补充水源水质。相关性分析表明,景观湖水体叶绿素a含量与N、P营养盐呈显著正相关,但却与水温呈极显著负相关,这显示了草型景观湖水质的显著特征;主成分分析显示,第一主成分包含硝态氮、亚硝态氮、总磷、活性磷、叶绿素、水温、透明度和pH等变量,第二主成分包括高锰酸盐指数和氨氮等变量;第一主成分中的水质参数可作为辰山植物园景观湖后续水生态管理中的主要监测对象;此外,主成分分析还显示TP对水体叶绿素的增加具有很高正权重。
Effects of restoration of submerged aquatic-vegetations on water quality of lakes in Chenshan Botanical Garden in Shanghai were investigated.Relationships among water quality parameters were analyzed by applying the correlation analysis and the principal components analysis.Results showed that chlorophyll（Chl-a）,transparency（SD）,and nutrients were significantly altered after the restoration of submerged aquatic-vegetations,except permanganate index（CODMn）.During the study period,water quality in Chenshan Botanical Garden was significantly improved compared to the outside river.At the end of the study,Chl-a,total nitrogen（TN）,total phosphorus（TP）,SD and CODMn were 5.48±1.93 μg/L,1.40±0.136 mg/L,0.080±0.015 mg/L,108±20 cm and 5.50±1.26 mg/L,respectively.Correlation analysis showed that the Chl-a was positively correlated with N,P,while negatively correlated with water temperature at a 5% significance level.Principal component analysis showed that the first principal component contained nitrate,nitrite nitrogen,total phosphorus,reactive phosphorus,chlorophyll-a,water temperature,transparency,pH and other variables,and the second component included permanganate index and ammonia nitrogen and other variables.In addition,principal component analysis also showed that the TP on chlorophyll-a increased with high positive weights.The first principal component of water quality parameters can be used in the monitoring programs for ecological management of lake landscapes.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第1期178-184,共7页
Chinese Journal of Environmental Engineering
基金
上海市重点学科水生生物学建设项目(S30701)
关键词
辰山植物园
景观湖水质
沉水植被
相关性分析
主成分分析
Chenshan Botanical Garden
lake water quality
submerged aquatic-vegetations
correlation analysis
principal components analysis
