Chemical and Biological Technologies in Agriculture

Table 3 Principal components on correlations of functional groups of Hu

From: Urease and β-glucosidase activity enhanced the transformation of functional groups of humin amended by straw and straw-derived biochar

	Principal components 1	Principal components 2	Principal components 3
Eigenvalues	3.65	1.53	0.57
Percent (%)	60.83	25.44	9.50
Cum percent (%)	60.83	86.27	95.77
Eigenvectors
Carboxyl C	0.34	0.30	0.89
Phenolic-C	0.48	0.17	− 0.18
Aryl-C	− 0.47	0.35	0.02
O-Alkyl-C	0.46	0.27	− 0.37
Methoxyl C	0.47	− 0.24	− 0.07
Alkyl C	0.04	− 0.79	0.20

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