封底与不封底微型蒸发器测定东北典型黑土区土壤蒸发量差异性研究

发布时间：2018-03-29 00:29

本文选题：微型蒸发器　切入点：封底　出处：《灌溉排水学报》2016年12期

【摘要】：土壤水分蒸发既是水循环的一个重要过程,又是水量平衡计算中的重要组成部分。在中国东北典型黑土区分别测定了封底与不封底的微型蒸发器的土壤蒸发量,比较了二者蒸发量差异。结果表明,(1)4—9月封底蒸发器的土壤蒸发量比不封底蒸发器平均高出0.51 mm/d,不封底蒸发器测定的土壤蒸发量更接近真实值;(2)出苗前、生长季和收获后的封底蒸发器的土壤蒸发量均值均大于不封底蒸发器,差异极显著,且封底蒸发器逐月的土壤蒸发量均值大于不封底蒸发器;(3)降雨量对测试结果有重要影响,在降雨量较大的月份,二者蒸发量测定值无显著差异,在其他降雨量小的月份,二者差异显著。因此,在一般条件下建议使用不封底的微型蒸发器测定土壤蒸发会更准确,若研究区域雨水较多,可以使用封底的微型蒸发器测定土壤蒸发。
[Abstract]:Soil water evaporation is not only an important process of water cycle, but also an important part of water balance calculation. The results showed that the soil evaporation of the evaporator was 0.51 mm / d higher than that of the unsealed evaporator in April-September, and the soil evaporation measured by the unsealed bottom evaporator was closer to the true value before seedling emergence. The average value of soil evaporation in growing season and after harvest was higher than that in unsealed evaporator, and the monthly mean value of soil evaporation of bottom evaporator was greater than that of unsealed bottom evaporator. There was no significant difference in evaporation between the two groups in the month of higher rainfall, but in other months with low rainfall, the difference was significant. Therefore, it is suggested that the micro-evaporator with no bottom seal should be used to measure soil evaporation more accurately under general conditions. If Rain Water has more research areas, soil evaporation can be measured by microevaporator.
【作者单位】：北京师范大学地理学与遥感科学学院地表过程与资源生态国家重点实验室;
【基金】：地表过程与资源生态国家重点实验室资助项目(2012-ZY-05)
【分类号】：S152.73

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