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Table 5 The correlation coefficients and the levels of significances between the difference in the day-to-day radial increment and the mean daily soil temperature

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

Trees Soil temperature at depth of 20 cm belowground Soil temperature at depth of 30 cm belowground Soil temperature at depth of 50 cm belowground
Korean fir tree with node 17 r = − 0.033 r = − 0.033 r = − 0.064
P = 0.697 P = 0.701 P = 0.453
Korean fir tree with node 18 r = 0.319 r = 0.325 r = 0.290
P = 0.0001 P < 0.0001 P = 0.0005
Korean fir tree with node 19 r = − 0.045 r = − 0.051 r = − 0.071
P = 0.598 P = 0.552 P = 0.408