Table 2.

Coefficient of the comprehensive indexes CIx (comprehensive indexes) and proportion in 2022

Principle factors	Cl1	Cl2	Cl3	Cl4	Cl5	Cl6
Factor weight	0.69	0.08	0.07	0.06	0.05	0.04
Eigenvalue	16.53	2.03	1.63	1.56	1.20	1.05
Coutributive ratio (%)	59.02	7.25	5.84	5.56	4.29	3.76
Cumulative contribution rate (%)	59.02	66.27	72.11	77.67	81.96	85.72
Eigenvector
Leaf area	0.96	0.10	0.00	-0.01	0.04	0.08
Plant height	0.94	-0.22	-0.04	-0.03	0.10	0.00
SPAD	0.79	-0.39	-0.02	-0.13	0.02	-0.18
Canopy temperature	0.95	-0.19	-0.05	-0.01	0.05	-0.01
Leaf water potential;	0.80	-0.38	0.28	-0.05	-0.01	0.06
Relative water content	0.71	-0.39	0.28	0.20	-0.10	0.09
Root dry weight;	0.95	0.20	-0.08	0.10	-0.02	0.14
Fresh root/shoot ratio	0.26	0.18	0.04	-0.65	0.37	-0.02
Dry root/shoot ratio	0.55	0.35	-0.35	0.25	0.06	-0.46
Water loss rate of shoot	0.28	0.35	-0.72	-0.04	0.13	0.12
Water loss rate of root	-0.16	-0.05	-0.19	0.81	-0.13	0.08
Total root length	0.75	0.42	-0.01	-0.15	0.10	0.13
Projection area	0.91	0.16	-0.03	0.11	-0.04	0.18
Surface area	0.62	0.49	0.34	-0.18	-0.23	-0.21
Average diameter	0.47	0.14	0.16	0.37	0.51	-0.53
Average volume	0.67	0.34	0.11	-0.12	-0.09	0.03
Average lateral root emergence angle	0.95	0.10	0.02	0.09	-0.05	0.10
Average lateral root tip angle	0.97	-0.16	-0.02	0.01	0.02	0.04
Average length—all roots	0.97	-0.01	-0.07	0.05	0.04	0.10
Average length—all lateral roots	0.98	0.04	-0.04	0.08	-0.01	0.10
Lateral root count	0.94	0.13	-0.03	0.11	-0.05	0.15
Maximum width	0.91	-0.30	-0.08	-0.09	-0.02	-0.08
Maximum depth	0.96	-0.11	0.04	0.03	-0.04	0.05
Width/depth ratio	0.85	-0.41	-0.09	-0.13	-0.06	-0.14
Specific root length	0.85	0.25	0.02	0.06	0.05	0.20
Specific root surface area	-0.15	0.13	0.62	0.28	0.59	0.21
Specific root volume	0.48	0.33	0.42	0.03	-0.52	-0.36
Root tissue density	-0.42	0.31	0.22	0.08	-0.19	0.30