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Table 1 Correlation coefficients between WUE with VPD, light intensity and soil water content

From: Responses of forest carbon and water coupling to thinning treatments from leaf to stand scales in a young montane pine forest

WUE across spatial scales VPD Light intensity (PAR or Transmitted solar radiation) Soil water content at 20 cm Soil water content at 40 cm
Leaf-level
 Leaf-level WUE − 0.25*** 0.33*** − 0.25 − 0.37**
 Leaf-level WUEi 0.45*** 0.11 − 0.47*** − 0.55***
Tree-level
 Tree-level WUE − 0.54** − 0.37 0.07 − 0.03
Stand-level
 Stand-level WUE − 0.79*** − 0.61** − 0.005 − 0.14
 Stand-level WUEi − 0.20 − 0.85*** − 0.40 − 0.64*
  1. Light intensity includes PAR at the leaf level and transmitted solar radiation at tree and stand levels. Star indicates the significant level at 0.01***, 0.05**, and 0.1*
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