Fig. 3From: Responses of water use in Moso bamboo (Phyllostachys heterocycla) culms of different developmental stages to manipulative droughtLinear regression (a, c, d) of average vapor pressure deficit (VPD, kPa) and sap flow density (Js, g∙m− 2∙s− 1) in the daytime, and linear regression (b, d, f) of residuals plotted against soil water content (SWC, %) in old (a, b), mature (c, d), young (e, f) in ambient (A) and throughfall reduction treatment (TRT). The significance level (p < 0.001) is marked by Asterisks (*) for these significant fitting model. Different letters behind r-square value denote the significant difference in the slopes of the regression lines between ambient and drought (ANCOVA, (a) F (1, 22) = 58.096, p < 0.001; (c) F (1, 22) = 5.677, p = 0.018; (e) F (1, 34) = 65.727, p < 0.001). Data only in sunny days during growing seasons in 2017 and 2018 were included (n = 211)Back to article page