• 研究报告 •

半干旱沙丘草甸过渡带人工杨树蒸腾耗水规律

1. 1内蒙古农业大学水利与土木建筑工程学院， 呼和浩特 010018; 2内蒙古自治区水资源保护与利用重点实验室， 呼和浩特 010018）
• 出版日期:2020-10-10 发布日期:2021-04-09

Transpiration and water consumption of poplar trees in semi-arid dune meadow transition zone.

JIA Tian-yu1, LIU Ting-xi1,2*, DUAN Li-min1,2, ZHANG Yi-ran1, TONG Xin1,2, BAO Yong-zhi1

1. (1College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China; 2Key Laboratory of Inner Mongolia Water Resource Protection and Utilization, Hohhot 010018, China).
• Online:2020-10-10 Published:2021-04-09

Abstract: It is important to clarify the transpiration and water consumption of artificial vegetation for ecological construction in desertification area. In this study, we used thermal dissipation probe (TDP) and automatic weather stations to monitor longterm trunk sap flow of a poplar plantation and environmental factors in Horqin sandy land. We analyzed the dynamics of poplar sap flow and the relationship between sap flow and environmental factors. The results showed that the diurnal variation of sap flow generally followed a normal distribution, and occasionally a multi-peak curve. Weather conditions affected sap flow rate, with highest values on sunny days and lowest values on rainy days. In the growing season, sap flow rate was positively correlated with solar radiation intensity, saturated water vapor pressure difference and air temperature, with correlation coefficients R2 of 0.88, 0.81 and 0.76, respectively. There was a negative correlation between sap flow rate and air relative humidity, with aR2 of 0.79. The Penman-Monteith (P-M) model was constructed to simulate the potential evapotranspiration of poplar plantation and verified with the filed data. The results showed that the simulation effect was of high precision, with a R2 of 0.83. Water consumption of poplar via evapotranspiration mainly depended on groundwater. The groundwater level dropped obviously accompanied by strong evapotranspiration of poplar during 9:00-18:00, after which groundwater level rose to some extent.