Table 2.

Loadings of heavy metals and soil physicochemical properties on principal components for 81 soil samples.

	Principal components			Principal components
	1	2		1	2	3	4
Cu	0.778	0.238	Cu	0.754	0.130	− 0.226	− 0.102
Zn	0.968	− 0.029	Zn	0.936	− 0.011	− 0.238	− 0.030
Pb	0.789	− 0.342	Pb	0.731	− 0.169	− 0.271	0.121
Cd	0.820	0.118	Cd	0.751	0.263	− 0.344	0.069
Fe	0.289	0.861	Fe	0.353	0.413	0.301	− 0.623
Mn	0.817	− 0.285	Mn	0.805	− 0.286	− 0.146	0.084
Eigenvalue	3.588	1.012	pH	0.593	0.183	0.364	− 0.325
Variance contributes/%	59.799	16.867	SOM	0.361	0.782	0.274	0.199
Contribution of accumulated variance/%	59.799	76.666	TN	− 0.152	0.781	0.122	0.406
			TP	0.683	− 0.328	0.482	0.007
			AP	0.292	− 0.444	0.707	0.274
			AK	0.384	0.013	0.078	0.560
			Eigenvalue	4.522	1.928	1.372	1.126
			Variance contributes/%	37.683	16.066	11.430	9.380
			Contribution of accumulated variance/%	37.683	53.749	65.179	74.558