固沙植被土壤水分蒸散发特征及其影响因素

Characteristics and Influencing Factors of Soil Water Evaporation in Sand-fixing Vegetation

利用微型蒸发器测定研究区三种固沙植物的土壤水分蒸散发量,明确了固沙植被土壤水分蒸散发的季节变化特征,基于主成分分析、多元逐步回归等方法得到了影响土壤水分蒸散发量的主要因素.结果表明:1)研究区内固沙植被土壤水分蒸散发夏季最高、春秋其次;2)主成分分析表明,温度因子对研究区土壤水分蒸散发的影响程度最高,辐射因子的影响程度其次,水气因子以及风力因子的影响程度则较小;3)多元逐步回归分析建立线性模型经检验模型合理,可预测固沙植被土壤水分蒸散发量.

The soil moisture evapo-transpiration of three sand-fixing plants in the study area was measured by Micro-Lysimeter,and the seasonal variation characteristics of soil moisture evapotranspiration of sand fixing vegetation were clarified.The results showed that:1)Soil moisture evapotranspiration was the highest in summer and the second in spring and autumn.2)Principal component analysis showed that the influence of temperature factor on soil moisture evapotranspiration was the highest,the influence of radiation factor was the second,and the influence of moisture factor and wind force factor was small.3)The linear model established by multiple stepwise regression analysis,the test model is reasonable to predict the evapotranspiration of soil moisture in sand-fixing vegetation.