Table 3 Correlation coefficients of Pxrf content of metals and related factors.

Metal category	Mn		Pb		Cu		Zn		Sr		Fe
Transformation form	Pxrf	ln(Pxrf)	Pxrf	ln(Pxrf)	Pxrf	ln(Pxrf)	Pxrf	ln(Pxrf)	Pxrf	ln(Pxrf)	Pxrf	ln(Pxrf)
1	0.810**	0.797**	0.933**	0.865**	0.214	0.167	0.936**	0.935**	0.376	0.391	0.756**	0.762**
2	0.802**	0.796**	0.954**	0.942**	0.232	0.187	0.986**	0.981**	0.335	0.346	0.756**	0.784**
3	0.811**	0.792**	0.861**	0.772**	0.198	0.148	0.938**	0.877**	0.406	0.425	0.738**	0.726**
4	− 0.471*	− 0.446*	0.194	0.383	− 0.316	− 0.365	0.275	0.317	0.199	0.198	− 0.325	− 0.257
5	− 0.578**	− 0.54**	0.266	0.436	− 0.220	− 0.261	0.356	0.414	0.164	0.163	− 0.365	− 0.297
6	− 0.371	− 0.349	0.109	0.301	− 0.399	− 0.454*	0.150	0.182	0.228	0.226	− 0.283	− 0.216
7	− 0.291	− 0.272	0.034	0.217	− 0.454*	− 0.514*	0.042	0.072	0.250	0.248	− 0.241	− 0.176
8	− 0.083	− 0.039	0.494*	0.629**	0.066	0.047	0.336	0.440	− 0.271	− 0.288	− 0.093	0.010
9	− 0.037	0.000	0.516*	0.671**	− 0.037	0.000	0.391	0.481*	− 0.255	− 0.271	− 0.086	0.020
10	− 0.110	− 0.067	0.441	0.553*	− 0.110	− 0.067	0.250	0.361	− 0.286	− 0.303	− 0.096	0.003
11	− 0.124	− 0.083	0.386	0.479*	− 0.124	− 0.083	0.163	0.276	− 0.297	− 0.316	− 0.096	− 0.002

1 2, and 3 indicate the original value of ICP-MS, logarithmic transformation, and squared transformation, respectively; 4, 5, 6, and 7 represent the original value of water content, logarithmic transformation, square transformation, and cubic transformation, respectively; 8, 9, 10, and 11 represent the original value of organic matter, logarithmic transformation, square transformation, and cubic transformation, respectively; **indicates 0.01 level (two tailed), the correlation was significant; *indicates 0.05 level (two tailed), the correlation was significant.

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