为准确地掌握东北农田黑土水分蒸发量的变化规律,2007年8月开始在吉林省吉林市龙潭区江密峰苗圃进行蒸发量测量试验,采用称质量法测量不同设置水分条件下农田黑土的昼夜蒸发量,并根据蒸发量与测量的气象因子建立了相应的回归方程.结果表明:土壤蒸发量与土壤含水量呈极显著正相关;土壤蒸发量在不同土壤含水量之间差异显著.通常情况下,土壤白天的蒸发量大约是夜间的12倍,全天蒸发量集中在11:00-15:00,占全天蒸发量的60%～70%.土壤蒸发量与光合有效辐射和风速呈显著的正相关,与其它气象因子相关关系不显著.%An evaporation experiment was conducted to study the daily variation of evaporation on arable mollisol under different soil moisture conditions in Jiangmifeng Nursery of Longtan District, Jilin City in October 2007. Regressive equations be-tween evaporation on arable mollisol and meteorological factors were established in terms of the evaporation for both day and night under different soil moisture conditions. Results showed that evaporation was positively correlated with soil moisture,and there was a significant difference in evaporation between different soil moisture levels. The evaporation for day was u-sually 12 times as much as that for night, and the peak of evaporation occurred between 11am and 15 pm, accounting for 60% ～70% of the total. The evaporation of arable mollisol was positively related to photosynthetically active radiation and wind speed, but insignificantly related to other meteorological factors.
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