摘要
以崇明北湖为例,采用广义加性模型(GAM)对该湖的叶绿素a浓度与相关环境因子进行分析.结果表明,叶绿素a浓度与总氮、总磷和水温之间存在较好的非线性关系(P<0.05),叶绿素a浓度与总磷之间的关系先为单调递增,当总磷浓度达到0.12mg/L时,变为单调递减;不同总氮浓度区间上,总氮对叶绿素a浓度的影响不同,氮浓度为0.6～1.8mg/L时,对叶绿素a浓度的影响不大;水温在24～26℃时,叶绿素a浓度最高.叶绿素a浓度与氮磷比之间也存在较好的非线性关系(P<0.1),氮限制时,叶绿素浓度与氮磷比呈反比;磷限制时,叶绿素a浓度随着氮磷比单调递减.
The relationships between chlorophyll-a and its related environmental factors in Beihu lake was studied by GAM method. The total phosphorus, total nitrogen and water temperature were significant as explanatory variables in explaining chlorophyll-a （P〈0.05）. Chlorophyll-a initially increased monotonically with the total phosphorus, but decreased monotonically after the total phosphorus reached 0.12mg/L. Impacts of different total nitrogen concentrations on chlorophyll-a varied, being weak when the total nitrogen concentration ranged from 0.6 to 1.8mg/L. Highest chlorophyll-a concentrations occurred when the water temperature ranged from 24 to 26℃. Furthermore, the relationship between chlorophyll-a and the TN：TP ratio was significant （P〈0.1） nonlinear relationship. Chlorophyll-a was inversely related to TN：TP ratio under nitrogen-limitation. Chlorophyll-a decreased monotonically with TN：TP ratio under phosphorus-limitation.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2009年第12期1291-1295,共5页
China Environmental Science
基金
国家自然科学基金资助项目(40601095)
上海市科学技术委员会科研计划项目(07DZ12052)
关键词
回归模型
广义加性模型(GAM)
叶绿素A
环境因子
崇明北湖
regression models
generalized additive model （GAM）
chlorophyll-a
environmental factors
Beihu Lake of Chongming Island
