Table 3 Principal component analysis results of PTEs of oasis agricultural soil in the source region of the Tarim River.

PTEs	Yarkant River Oasis		Kashgar Oasis			Aksu Oasis			Hotan Oasis
PTEs	F1 (61.6%)	F2 (21.8%)	F1 (58.9%)	F2 (24.8%)	F3 (7.9%)	F1 (52.7%)	F2 (22.3%)	F3 (11.5%)	F1 (85.2%)
As	0.441	0.746	0.830	0.347	0.177	0.527	0.447	0.515	0.825
Cd	0.764	0.091	0.347	− 0.714	0.573	0.592	− 0.354	− 0.219	0.761
Co	0.949	− 0.269	0.938	− 0.234	− 0.198	0.938	− 0.017	− 0.310	0.961
Cu	0.915	− 0.346	0.929	− 0.313	− 0.070	0.920	− 0.330	− 0.002	0.989
Ni	0.587	− 0.632	0.665	− 0.533	− 0.444	0.871	− 0.241	− 0.341	0.967
Pb	0.725	0.606	0.823	0.335	0.386	0.728	0.504	− 0.244	0.925
Sb	0.929	0.054	0.873	0.265	0.031	0.702	− 0.115	0.647	0.963
Sn	0.459	0.790	0.526	0.786	− 0.152	0.245	0.923	0.144	0.892
Tl	0.785	0.285	0.585	0.797	0.021	0.438	0.843	− 0.238	0.960
V	0.939	− 0.305	0.889	− 0.300	− 0.252	0.937	− 0.146	− 0.076	0.922
Zn	0.902	− 0.270	0.800	− 0.369	0.184	0.729	− 0.331	0.427	0.963

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