The Scientific World Journal

Research Article

Factors Controlling Carbon Metabolism and Humification in Different Soil Agroecosystems

Table 4

Principal components (PC) and component loadings related to physical, chemical, and biochemical properties determined in the different soils.


	PC1	PC2	PC3

TOC		0.518	0.355
THC		−0.175	0.184
AHC		0.007	0.281
TN	0.585	0.496	0.611
EG		−0.005	0.402
TG	0.196		−0.111
WSC	0.288	−0.091
DH-ase		0.419	0.261
B/E₃s		0.164	−0.169
N/Os	0.101		0.233
porosity	0.057	−0.331
Var. Sp.	4.498	2.196	2.382
Prp. Tot.	0.409	0.200	0.217

TOC: total organic carbon; THC: total humic carbon; AHC: active humic carbon; TN: total nitrogen; EG: extracellular -glucosidase activity; TG: -glucosidase activity; WSC: water soluble carbon; DH-ase: dehydrogenase activity; B/E₃s: benzene/toluene whole soil; N/Os: furfural/pyrrole whole soil. Var. Sp.: explained variance; Prp. Tot.: total proportionality.
Variables with component loadings used to interpret the PCs; threshold level: 0.7.