To fully understand the forest transpiration processes and evaluate the contribution of nocturnal sap flow to total transpiration in dryland region, the sap flow velocity in the stems of 4 sample trees of a 30m伊30m Larix principis鄄rupprechtii plantation was continually monitored with thermal dissipation probes (TDP) during the growing season (May to October) of 2011, at the semi鄄arid area (with an annual precipitation of 449 mm, but mostly concentrated in the summer months from July to September) of the north part of Liupan Mountain, NW China. Then, the sap flow density data measured in individual sample trees were used to calculate the sap flow amount in daytime, nighttime and whole day, and up鄄scaled to the stand level by using the index of sapwood area. Then, the dynamics of nocturnal sap flow and stem water recharge as
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