Table 5. An analysis of principal components reflecting soil indicators.

Soil indicators	Total data set					Biological				Chemical			Physical
	PC1	PC2	PC3	PC4	COM	PC1	PC2	PC3	COM	PC1	PC2	Communalities	PC1	C
BD	−0.918	−0.086	0.201	0.089	0.898								−0.993	0.985
WAT	0.920	0.066	−0.120	−0.143	0.885								0.992	0.985
POR	0.916	0.087	−0.204	−0.089	0.896								0.968	0.938
SOM	0.950	−0.086	0.227	0.124	0.977					0.983	0.108	0.979
TN	0.802	−0.239	0.290	0.435	0.973					0.881	0.210	0.821
AN	0.9 51	−0.163	0.227	0.069	0.987					0.991	0.097	0.991
TK	−0.758	−0.419	0.432	0.126	0.952					0.624	0.672	0.866
AK	0.534	−0.286	0.631	−0.356	0.892					−0.645	0.671	0.841
pH	−0.832	0.222	0.404	0.046	0.906					−0.803	0.466	0.861
URE	0.599	0.257	0.7 53	−0.004	0.993	0.467	0.079	0.8 76	0.992
CAT	0.005	0.892	0.362	0.254	0.991	0.946	0.171	0.048	0.927
INV	0.051	0.744	−0.013	0.661	0.994	0.748	−0.133	−0.141	0.597
PPO	0.039	0.942	0.033	−0.252	0.954	0.914	0.113	−0.164	0.876
MBC	0.388	−0.845	0.047	0.316	0.966	−0.763	−0.126	0.488	0.837
MBN	−0.660	−0.496	0.140	0.236	0.757	−0.539	0.702	−0.291	0.868
MBP	−0.345	0.016	0.684	−0.279	0.665	0.082	0.964	0.196	0.974
Eigenvalue	7.598	3.680	2.221	1.189		3.388	1.504	1.178		4.175	1.183		2.908
Variance (%)	47.485	22.999	13.882	7.432		48.397	21.488	16.382		69.583	19.717		96.932
Cumulative variance (%)	47.485	70.485	84.366	91.799		48.397	69.885	86.717		69.583	89.300		96.932

Note:

Abbreviations for soil indicators and ecological restoration techniques are shown in Tables 2 and 3; PC, principal component; boldface factor loading values are considered highly weighted. Boldface and underlined loading values correspond to the soil indicators included in the MDS.