Study on spatial autocorrelation analysis of cadmium content in farmland soil at different sampling intervals

doi:10.16178/j.issn.0528-9017.20221280

Abstract

Abstract:

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.

Key words: spatial autocorrelation, sampling interval, Cd, scale effect

CLC Number:

CHEN Yinzai, CHEN Baicheng, MEI Haotian, XIA Feng, LIU Dan. Study on spatial autocorrelation analysis of cadmium content in farmland soil at different sampling intervals[J]. Journal of Zhejiang Agricultural Sciences, 2024, 65(1): 224-229.

Figures/Tables 5

References 32

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置信度/%	Z得分(标准差)	P值(概率)
90	<-1.65或>1.65	<0.10
95	<-1.96或>1.96	<0.05
99	<-2.58或>2.58	<0.01

置信度/%	Z得分(标准差)	P值(概率)
90	<-1.65或>1.65	<0.10
95	<-1.96或>1.96	<0.05
99	<-2.58或>2.58	<0.01

间距/ m	最大值	最小值	平均值	变异系数/	偏度	峰度
40	0.220	0.020	0.067	74.785	1.721	2.491
20	0.250	0.020	0.063	71.246	2.031	0.653

间距/ m	最大值	最小值	平均值	变异系数/	偏度	峰度
40	0.220	0.020	0.067	74.785	1.721	2.491
20	0.250	0.020	0.063	71.246	2.031	0.653

间距/m	Moran's I	Z得分	P值	全局分布	全局自相关性
40	-0.106 0	-0.758 4	0.214	空间孤立	不显著空间负相关
20	0.163 6	2.897 5	0.009	空间聚集	显著空间正相关