学术
摘 要:
根据2004年1月-2006年12月逐月对淀山湖水体叶绿素a含量及水质理化因子的测定结果，分析了叶绿素a的时空分布，评价了淀山湖水体营养状态，找出与叶绿素a显著相关的环境因子，并建立了多元逐步回归方程。3年期间，淀山湖叶绿素a含量均值为29．98mg／m^3，变幅3．48—141．63mg／m^3；每年分别在4—5月和7—9月出现峰值；水平分布上，Ⅱ站点金家庄附近叶绿素a含量最高，Ⅴ站点进水日和Ⅰ站点出水日含量较低。基于叶绿素a、透明度和总磷等参数，依据修正的卡尔森营养状态指数公式，计算得出淀山湖TSI平均值为71．6（〉53），全湖处于富营养化状态。应用SPSSWin和DPS等统计分析软件进行相关性分析结果表明叶绿素a与水温、pH、高锰酸盐指数、BOD5、硝酸氮呈极显著相关，而与磷酸盐呈极显著负相关；与氨氮、亚硝酸氮呈显著相关，而与总磷呈显著负相关。综合逐步回归方程表明，影响淀山湖叶绿素a的主要环境因子有高锰酸盐指数、BOD5、硝酸氮、溶氧、透明度和水温。[著者文摘]
文章出处:
《上海水产大学学报》-2008年1期 -58-64页
分 类 号:
文献标识码:
A
文章编号:
1004-7271（2008）01-0058-07
Mutlianalysis between chlorophyll-a and environmental factors in Dianshan Lake water
WANG Li-qing, ZHANG Jun-yi, WANG Xu-chen, PENG Zi-ran, WANG Yan （College of Aqua-life Science and Technology, Shanghai Fisheries University, Shanghai 200090, China）
Abstract:
The correlation and regression equation between chlorophyll-a（chla） and some environmental factors were analyzed in this paper respectively, based on the monthly monitoring data in the Dianshan Lake from Jan. 2004 to Dec. 2006. And modified Carlson trophic state index for all the sampling sites was also calculated to assess the water condition of Dianshan Lake. The results showed that the concentration of ehlorophyll-a in Dianshan Lake ranged from 3.48 mg/m^3 to 141.63 mg/m^3, and the mean was 29.98 mg/m^3. Two peaks of Chla concentration occurred in Apr. to May（early summer） and Jul. to Sept. （autumn）. Chla concentration was higher in Ⅱ Jinjiazhuang than those in Ⅴ （ water inlet） and Ⅰ （ water outlet） sampling sites. Based on the modified Carlson trophic state index （ TSIM = 71. 6 ） , the whole lake was in eutrophic state. The multianalysis results showed that the significant environmental affecting factors for chlorophyll-a were different. However, the relationships between chlorophyll-a and WT, pH, CODMn, BOD5 and NO3-N were positive, and that between chlorophyll-a and PO4-P, TP was negative.[著者文摘]
Key words:
Dianshan Lake; chlorophyll-a; correlation analysis; multiple stepwise regression
基金资助:
上海市重点学科建设项目（Y1101）
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