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

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

  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
  1. Ai mean temperature of the month i of the current year; Ji precipitation of the month i of the current year; Ri air relative humidity of the month i of the current year; Hi mean maximum temperature of the month i of the current year; Pi PDSI of the month i of the current year; Li mean minimum temperature of the month i of the current year; PPi PDSI of the month i of the past year