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Table 1 Correlation coefficients and the levels of significances among the environmental factors

From: Precision monitoring of radial growth of trees and micro-climate at a Korean Fir (Abies koreana Wilson) forest at 10 minutes interval in 2016 on Mt. Hallasan National Park, Jeju Island, Korea

  Mean daily soil temp. at depth of 20 cm Mean daily soil temp. at depth of 30 cm Mean daily soil temp. at depth of 50 cm Mean daily ambient temp. Mean daily relative humidity Mean daily solar radiation Mean daily soil moist. Content at depth of 20 cm Mean daily soil moist. Content at depth of 30 cm Mean daily soil moist. Content at depth of 50 cm
Daily precipitation −0.170 − 0.148 − 0.158 − 0.144 0.363 − 0.490 0.809 0.701 0.488
P = 0.05 P = 0.08 P = 0.06 P = 0.09 P < 0.0001 P < 0.0001 P < 0.0001 P < 0.0001 P < 0.0001
Mean daily soil temp. at depth of 20 cm   0.976 0.941 0.961 0.456 −0.216 0.055 0.019 −0.158
  P < 0.0001 P < 0.0001 P < 0.0001 P < 0.0001 P = 0.01 P = 0.52 P = 0.83 P = 0.06
Mean daily soil temp. at depth of 30 cm    0.989 0.907 0.506 −0.285 0.061 0.029 −0.180
   P < 0.0001 P < 0.0001 P < 0.0001 P = 0.001 P = 0.47 P = 0.73 P = 0.03
Mean daily soil temp. at depth of 50 cm     0.863 0.503 −0.277 0.038 0.0098 −0.209
    P < 0.0001 P < 0.0001 P = 0.001 P = 0.66 P = 0.91 P = 0.01
Mean daily ambient temperature      0.377 −0.153 0.053 0.014 −0.174
     P < 0.0001 P = 0.07 P = 0.53 P = 0.87 P = 0.04
Mean daily relative humidity       −0.763 0.475 0.491 0.407
      P < 0.0001 P < 0.0001 P < 0.0001 P < 0.0001
Mean daily solar radiation        −0.545 −0.511 −0.387
       P < 0.0001 P < 0.0001 P < 0.0001
Mean daily soil moist. Content at depth of 20 cm         0.942 0.707
        P < 0.0001 P < 0.0001
Mean daily soil moist. Content at depth of 30 cm          0.758
         P < 0.0001