《Table 3 Daily average and coefficient of variation (CV) of soil water content (SWC) at depths of 10

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《Sap flow characteristics and physiological adjustments of two dominant tree species in pure and mixed plantations in the semi-arid Loess Plateau of China》

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Note:CV is the ratio of standard deviation to mean value×100%.Mean±SD.

The daily SFn for P.tabuliformis and H.rhamnoides in pure plantations generally exhibited a decreasing trend during the observation period；meanwhile，the daily SFn for both these two species in mixed plantation exhibited a\""U\""type，with the higher value occurring in June and September（Fig.2）.The variation of daily SFn for P.tabuliformis in the plantation was significantly different（t=4.95，P<0.01，df=226）from that for the same species in mixed plantation.However，there was no significant difference（t=1.95，P=0.053，df=226）in daily variation of SFn for H.rhamnoides in pure and mixed plantations.Generally，the relative response of SFn for these two species significantly increased（P<0.05，df=2）among three rainfall classes in both pure and mixed plantations（Fig.3），when 10–15 mm class was not considered.However，no significant difference was observed either between rainfall classes of 5–10 and>15 mm for P.tabuliformis in pure plantation（P=0.09，df=7），or between rainfall classes of 0–5 and 5–10 mm for H.rhamnoides in pure plantation（P=0.14，df=7）.Moreover，the CVs of SFn for P.tabuliformis and H.rhamnoides in pure plantation were 39.1%and 37.59%，and were 43.64%and 36.58%for corresponding species in mixed plantation，respectively（Table 4）.