Effects of altitude and slope on the climate–radial growth relationships of Larix olgensis A. Henry in the southern Lesser Khingan Mountains, Northeast China

Ecological Processes

Table 3 Optimal simplified multiple regression model for growth-climate of L. olgensis

	Optimal simplified multiple regression equation	R²	p-value
Low altitude	Y = 0.330 × A₈ − 0.531 × J₉ + 0.349 × R₇	0.382	0.0080
Middle altitude	Y = − 0.067 × A₇ − 0.284 × J₉ − 0.460 × R₄ + 0.227 × R₆ + 0.285 × R₇	0.490	0.0020
High altitude	Y = − 0.122 × A₇ − 0.116 × H₆ − 0.179 × H₈ + 0.110 × P₇ + 0.325 × R₇	0.346	0.0060
Sunny slope	Y = 0.469 × A₈ − 0.402 × J₉ + 0.285 × P₆ − 0.436 × R₃ + 0.439 × R₇	0.639	0.0006
Shady slope	Y = − 0.146 × A₈ − 0.090 × L₉ + 0.267 × H₅ − 0.155 × H₇ − 0.230 × J₉ + 0.303 × PP₈ + 0.192 × R₇	0.413	0.0009

A_i mean temperature of the month i of the current year; J_i precipitation of the month i of the current year; R_i air relative humidity of the month i of the current year; H_i mean maximum temperature of the month i of the current year; P_i PDSI of the month i of the current year; L_i mean minimum temperature of the month i of the current year; PP_i PDSI of the month i of the past year