Table 2. Summary of the indices of climatic and topographic variables for honey tree species such as Kalopanax septemlobus, Tilia amurensis and Styrax obassis. Abbreviations: Min, minimum; Max, maximum; SD, standard deviation; TPI, topographic position index;, TWI, topographic wetness index; MAT, mean annual temperature; MAP, mean annual precipitation; Sun, solar radiation; n, sample size.

Variables	Kalopanax septemlobus (n = 167)				Tilia amurensis (n = 539)				Styrax obassis (n = 359)
	Min	Max	Mean	SD	Min	Max	Mean	SD	Min	Max	Mean	SD
Topographic Variables
Elevation	267	1663	943.13	235.32	386	1579	1016.58	219.64	203	1311	702.21	182.19
Slope	2.72	51.82	19.57	9.17	1.22	51.82	18.63	8.68	0.75	42.91	19.69	8.11
TPI	–15.25	13.13	0.96	4.38	–15.5	18	1.26	4.12	–18.75	12.13	0.16	4.23
TWI	3.73	14.3	5.56	1.68	3.64	14.29	5.47	1.39	3.65	15.40	5.97	2.15
Climatic Variables
MAP	1219	2097	1541.49	185.84	1204	2180	1616.25	211.95	1219	2173	1493.83	151.64
MAT	5.8	11.8	8.5	1.15	53	112	80.74	11.53	6.5	11.8	9.61	0.87
Sun	741.09	1707.82	1239.73	251.83	687.09	1707.82	1188.30	247.67	722.09	1709.82	1265.65	232.19