叶绿素a指数与氮磷特征模型研究:以兴隆湖为例

A Study on the Relationship Between Chlorophyll a Index and Nitrogen and Phosphorus Characteristics in Xinglong Lake

该文针对近几年水环境治理中水体富营养化导致的浮游藻类疯狂繁殖等问题,构建了叶绿素a与氮磷的关系特征模型。利用GF-2-PMS2高分遥感影像中纯净水体和绿植在各波段的光谱信息特征,通过宽带绿色指标中比值植被指数运算Band4/Band3自动提取叶绿素浓度及其空间分布信息。用SPSS软件对兴隆湖总磷、总氮含量值与比值植被指数值进行函数拟合建立多元非线性函数模型,得到三者的关系特征模型。应用结果表明,叶绿素a比值植被指数与氮、磷的关系特征模型具有较高的准确率,与现场检测结果相符,为兴隆湖水体富营养化分析及水环境治理提供有效数据。

A characteristic model of the relationship between Chlorophyll a and nitrogen and phosphorus has been developed to solve the problem of plankton algae multiplication caused by Algal Bloom in recent years.Based on the spectral information characteristics of GF-2-PMS2 high-resolution remote sensing images of purified water and green plants,the information of chlorophyll concentration and its spatial distribution was automatically extracted by the operation of Band4/Band3 in the ratio vegetation index(RVI)of Broadband Greenness(5 indices).Using SPSS software to fit the values of total phosphorus(TP),total nitrogen(TN)and ratio vegetation index(RVI),the multivariate nonlinear function model was established.The application results showed that the vegetation index of Chlorophyll a ratio and the characteristic model of the relationship between nitrogen and phosphorus had a high accuracy rate,which was consistent with the on-the-spot detection results,and provided effective data for the analysis of Algal Bloom and water environment treatment.