Changes in sap flow at different slope positions It is evident from Fig 4 that the daily variations in sap flow of Salix psammophila show similar trends at all slope positions, but the sap flow rates of the same slope position show slight variations because of the differences in branch diameters, with an overall trend of D3 > D2 > D1.
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Sap flow of Salix psammophila and its principal influencing factors at different slope positions in the Mu Us desert.
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The daily accumulation changes in sap flow showed a trend of P1 > P3 > P2, and within the same diameter range, the sap flow at P1 was significantly different from that at P2 and P3, whereas the sap flow at P2 and P3 did not vary significantly.