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| Nocturnal sap flow variations and its influencing factors of Pinus tabulaeformis stand in a semi-arid environment |
| XU Zhibin1, CHEN Shengnan1, CHEN Lixin1, LIU Qingquan2, LIU Pingsheng2, ZHANG Zhiqiang1 |
1. School of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China;
2. Inner Mongolia Academy of Forestry, 010010, Hohhot, China |
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Abstract [Background] In recent years, the increase of atmospheric temperature has led to the aggravation of tree transpiration, and the management of forest land faced a series of problems such as water shortage. As an important part of sap flow, nocturnal sap flow is of great significance for accurate estimation of water consumption and water resource management of forest.[Methods] In the growing season of 2019, selecting Pinus tabulaeformis in the arboretum of Hohhot as the research object, the thermal diffusion method (TDP thermal probe) was used to measure sap flow, precipitation (mm), air temperature (℃), relatively humidity (%), wind speed (m/s), and global radiation (W/m2) were measured continuously with an Dynamet automatic weather station(Dynamet,USA). Soil water content was measured half-hourly at depths of 10 to 50 cm in each plot using the 5TE soil water sensor(Decagon,USA). All statistical analyses were carried out with SPSS 24.0 and Excel 2013, and significance was reported at the 0.05 level.[Results] 1) The nocturnal sap flow of P. tabulaeformis stand showed obvious daily and monthly variations in growing season. On the daily scale, nocturnal sap flow velocity of P. tabulaeformis stand showed a single decreasing trend. Nocturnal sap flow can be observed before 0 o'clock in each month and the decreased range of nocturnal sap flow velocity before 0 o'clock was more obvious. On the monthly scale, the stand nocturnal sap flow of P. tabulaeformis stand was the largest in May, followed by September > June > August > July.2)On the daily scale, the nocturnal sap flow of P. tabulaeformis stand showed significant positive correlation with vapor pressure deficit, diurnal sap flow and relative extractable water (P<0.05), and showed significant negative correlation with wind speed(P<0.05) in growing season. The average contribution of nocturnal sap flow of P. tabulaeformis stand in growing season was 7%, the effect of different influencing factors on ratio of nocturnal sap flow to total sap flow was in the order of diurnal sap flow > vapor pressure deficit > global radiation.[Conclusions] There is a significant nocturnal sap flow of P. tabulaeformis stand in growing season, and environmental factors were significantly correlated with the nocturnal sap flow(P<0.05), if the nocturnal sap flow was not taken into account at stand scale in growing season, the monthly sap flow will be underestimated by 3.0%-11.5%.
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Received: 08 July 2020
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