基于GeoDA的长江干流江苏段总磷空间相关性研究

A Study on GeoDA-Based Spatial Correlation Analysis of Total Phosphorus in the Jiangsu Reach of the Yangtze River

利用地理空间分析方法和空间分析软件,使用2006-2015年长江江苏段10个干流和45个入江支流监测点位的总磷浓度年均数据,分析了长江江苏段干流和支流总磷浓度的空间相关性及其时空演变特征。研究发现,长江总磷污染呈全局正相关,相关指数总体呈先减小后增加的趋势,至2015年增至最大;干流总磷污染重心先向西北后向西南移动,支流总磷污染重心先向西北再向东南移动,重心移动幅度不大,二者均有向北面移动的趋势,同时移动幅度接近。指出长江干流总磷污染与支流的汇入是密不可分的。

Based on annually mean values of total phosphorus at monitoring points,of which 10 ones at mainstream and 45 ones at in-flowing tributaries of the Yangtze River at the Jiangsu reach,in the period of 2006 through 2015,the method of geographical spatial analysis and spatial analytical software GeoDA were used to analyse the spatial correlation and temporal evolution characteristics of total phosphorus contents there.It was found that the total phosphorus pollution in the Jiangsu reach of the Yangtze River showed an overall positive correlation,and its correlation indices presented a trend of decline first and then increase until reaching the maximum in 2015.In the mainstream,the centre of total phosphorus pollution moved to the northwest first and then towards southwest whilst in the tributaries that moved to the northwest first and then towards the southeast.The movement range was not wide,and both had trends of moving toward the north with similar extent.It indicated that the total phosphorus pollution in Yangtze River was closely related to its input from the tributaries.