“…Different sap flow methods and techniques have been used to measure tree and stand transpiration of poplar, including the stem heat balance (SHB) method (Allen, Hall, & Rosier, 1999; Bloemen et al., 2017; Hall & Allen, 1997; Hall, Allen, Rosier, & Hopkins, 1998; Tricker et al., 2009; Zhang, Simmonds, Morison, & Payne, 1997), the trunk tissue heat balance (THB) method (Hinckley et al., 1994; Petzold, Schwarzel, & Feger, 2011), the heat field deformation (HFM) method (Meiresonne et al., 1999) and the thermal dissipation (TD) method (Kim, Oren, & Hinckley, 2008; Lambs & Muller, 2002; Schmidt‐Walter, Richter, Herbst, Schuldt, & Lamersdorf, 2014; Xi, Di, Wang, Duan, & Jia, 2017). These studies related to poplar stands of longer rotations (Kim et al., 2008; Meiresonne et al., 1999; Petzold et al., 2011; Xi et al., 2017; Zhang et al., 1997), to uncoppiced, single‐stemmed SRC poplar (Bloemen et al., 2017; Hinckley et al., 1994; Schmidt‐Walter et al., 2014; Tricker et al., 2009) as well as to coppiced, multistemmed (Allen et al., 1999; Hall et al., 1998; Tricker et al., 2009) poplars. In all the afore mentioned studies, in particular in the ones on multistemmed SRC poplars, the recorded sap flow measurements, used to obtain stand transpiration, were carried out over a short time period (maximum of eight (Tricker et al., 2009) or 9 weeks (Hall et al., 1998)).…”