Spatial Variations in Concentration, Compositions of Glomalin Related Soil Protein in Poplar Plantations in Northeastern China, and Possible Relations with Soil Physicochemical Properties

Table 3

Two-way ANOVA results on spatial (site, soil layer) varaitions of GRSP (T-GRSP, EE-GRSP) concentration in poplar shelterbelt forests in Songnen Plain.

Index	T-GRSP concentration	T-GRSP storage	EE-GRSP concentration	EE-GRSP storage
Site
𝐹	62.75	54.94	65.59	57.53
𝑃 value	0.000	0.000	0.000	0.000
Soil layer
𝐹	64.87	59.21	39.32	35.32
𝑃 value	0.000	0.000	0.000	0.000
Interaction
𝐹	2.14	2.07	1.14	1.28
𝑃 value	0.003	0.005	0.310	0.187
Site-related differences (mean and their statistical significance)
Dumeng	2.93^cd	87.46^cd	0.48^b	14.32^b
Fuyu	2.65^d	71.66^d	0.38^bc	10.40^bc
Lanling	4.05^c	115.00^c	0.30^cd	8.78^cd
Mingshui	6.60^a	172.57^a	0.87^a	22.88^a
Zhaodong	5.25^b	143.91^b	0.22^d	6.01^d
Zhaozhou	2.10^d	56.76^d	0.33^cd	8.94^cd
Largest/lowest ratio	3.14	3.04	3.95	3.81
Soil layer-related differences (mean and their statistical significance)
0–20 cm	6.29^a	169.83^a	0.67^a	18.26^a
20–40 cm	4.51^b	123.07^b	0.51^b	14.06^b
40–60 cm	3.81^bc	105.25^bc	0.38^bc	10.50^bc
60–80 cm	2.92^cd	81.82^cd	0.33^c	9.20^c
80–100 cm	2.11^d	59.50^d	0.26^c	7.42^c
Largest/lowest ratio	2.98	2.85	2.58	2.46
Mean of pooled data	3.93	107.89	0.43	11.89

Note: Different lowercases indicate the related differences between different soil layers or between different sites were statistically significant (𝑃<0.05).