Study on spatial autocorrelation analysis of cadmium content in farmland soil at different sampling intervals
Taking a paddy field soil in Dinghai District,Zhoushan City as the research object,the spatial autocorrelation characteristics of cadmium(Cd)in farmland soil under 40 m and 20 m sampling intervals were comprehensively discussed by using the combined method of global spatial autocorrelation and local spatial autocorrelation.The results showed that there was an obvious scale effect at both sampling intervals,and the short sampling interval(20 m)was easier to reveal the spatial distribution of Cd element.For the safe use and treatment of CD-contaminated farmland soil,although the sampling interval of 40 m can reduce the investigation cost in the early stage,the specific location of the higher Cd content could not be accurately identified,which increased the uncertainty of safe use and treatment in the later stage,while the sampling interval of 20 m could accurately identify outliers.It is helpful to take targeted pollution prevention and control measures for the soil with high Cd content and cut off the pollution source,which provides a reference for the safe utilization and treatment of Cd-polluted farmland soil.
NETL
NSTL
万方数据
维普
