关键词: 土壤蒸发, 环境因子, 杨树人工林

Abstract: [Objective] The objective of this study was to find out the trends and properties of sandy soil evaporation beneath the canopy of poplar plantation.[Method] A weighing method was used to measure daily soil evaporation in a poplar plantation on the flood plain of Yongding river.The relationships between soil evaporation and environmental factors were detected through statistic methods including principal components and regression analysis.[Results] Soil evaporation during the growing season in 2010 and 2011 were 155.4 mm and 209.8 mm respectively,consuming 41.5%-42.4% of precipitation in the corresponding period.Soil water content,soil temperature,and atmosphere factor were the major factors that affected the change of soil evaporation.But the coupling relationship between atmosphere and soil evaporation was weaken when the soil water was poor.[Conclusion] Sandy soil evaporation beneath canopy was relatively strong.It was mainly affected by soil water condition,but also reacted to the changes of atmosphere factor and soil temperature.

Key words: soil evaporation, environmental factors, poplar plantation