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总磷是湖泊水质参数中的主要指标,从遥感数据中获得其时空上的分布信息对于理解、管理和保护湖泊生态系统是必要的。通过2009年4月至12月对鄱阳湖湖区和五河入口的表层水体进行采样分析,利用直接遥感反演算法和间接遥感反演算法,结合MODIS遥感数据择优反演鄱阳湖表层水体的总磷含量,同时分析总磷含量的时空特征和变化规律。结果表明:①从实验数据分析可知,总磷TP与总悬浮物浓度相关性较好,间接反演算法能够得到较好的反演结果;②TP是鄱阳湖水质的主要污染指标之一,TP含量在丰水期、平水期、枯水期三个时期呈上升趋势;③鄱阳湖三个时期TP含量的空间变化明显,中心湖区TP含量相对整个湖区较低,主航区和五河入口TP含量为全湖最高区域,常年处于高含量状态。
Total phosphorus is the main index in the lake water quality parameters. Obtaining its spatial and temporal distribution information from remote sensing data is necessary to understand, manage and protect the lake ecosystem. Through the sampling analysis of the surface water bodies in the Poyang Lake area and the Wuhe River entrance from April to December in 2009, direct remote sensing inversion algorithm and indirect remote sensing inversion algorithm were combined with MODIS remote sensing data to retrieve the total phosphorus in the surface water of Poyang Lake Content, while analyzing the temporal and spatial characteristics of total phosphorus content and changes in law. The results showed that: ①Through the analysis of experimental data, the correlation between total phosphorus TP and total suspended solids concentration was good, and the indirect inversion algorithm could get better inversion results; ②TP was one of the main pollution indicators of Poyang Lake water quality, TP content The content of TP in the three periods of Poyang Lake was obviously changed, the content of TP in central lake was lower than that in the whole lake, and the TP content in the main navigation area and Wuhe River entrance was all The highest area of the lake, perennial in a state of high content.