关键词: 蒸腾速率, 环境因子, 山杏, 黄土丘陵区

Abstract: In order to explore the relationship between transpiration water consumption of Armeniaca sibirica and environmental factors, this paper took the reproducing tree species of Armeniaca sibirica in Qingshuihe County, Hohhot City, Inner Mongolia Autonomous Region as the research objects, and measured the transpiration rate of Armeniaca sibirica, and studied the daily dynamic changes of the transpiration rate of Armeniaca sibirica and the environmental factors in combination with the factors such as solar radiation, air temperature, air relative humidity, vapor pressure deficit (VPD) and wind speed. The results showed that: ① The transpiration rate of Armeniaca sibirica showed obvious diurnal variation, and the variation trend presented bimodal curve. The first peak was 148.82 g·h^-1, the second peak was 144.75 g·h^-1, and there was a phenomenon of "noon break". The transpiration rate was higher in the daytime, lower at night and the variation range was relatively gentle. ② The transpiration rate of Armeniaca sibirica was significantly positively correlated with solar radiation, air temperature, VPD, wind speed, and negatively correlated with air relative humidity, and a time lag with the response of environmental factors. ③ The order of the influence of environmental factors on transpiration rate was solar radiation > air temperature > VPD > air relative humidity > wind speed.

Key words: transpiration rate, environmental factor, Armeniaca sibirica, loess hill district