Fig. 6From: Effects of variable retention harvesting on canopy transpiration in a red pine plantation forestScatter plots showing the correlation between daily average sap flux density (Js) and photosynthetically active radiation (PAR; a–c), air temperature (Ta; d–f) and vapour pressure deficit (VPD; g–i) for 2018, 2019 and 2020. R2 values are displayed in Table 2 (p < 0.001)Back to article page