Fluorescence Characteristics of Humic Acid in Chinese Black Soil under Long-Term Fertilization

Table 1

Correlation matrix between parameters of different fluorescence characteristics.

	f450/500	I436/I383	I454/I399	FLR	HLR	A4/A1	(C2+C3)/C1
f450/500	1	-.252	-.72	.78	-.78	-.72	-.68
I436/I383		1	.71	-.62	.62	.42	.74
I454/I399			1	-.89	.89	.77	.91
FLR				1	-1.00	-.81	-.92
HLR					1	.81	.92
A4/A1						1	.78
(C2+C3)/C1							1

and indicate significant differences at P < 0.05 and P < 0.01, respectively.