北方寒区冬季土壤蒸发量主要影响因子评价

为解决冬季土壤蒸发影响因子之间存在的多重相关性问题，以哈尔滨地区为例，采用主成分分析法对2008年11月至2009年3月的相对湿度、水汽压、气压、风向、风速、地面温度和气温等7个主要影响因子进行了分析评价。结果表明：哈尔滨地区冬季土壤蒸发量的变化是众多影响因子综合作用下相协调的结果。其中地温、气温、气压和水汽压是主要影响因素，研究结果为哈尔滨地区制定灌溉制度提供了参考依据。

Evaluation of Main Influence Factors for Soil Evaporation in Northern Cold Area

In order to solve the problem of multiple correlation among influence factors of soil evaporation in winter, taking Harbin for example, principal component analysis was adopted to analyze and evaluate these seven main influence factors such as relative humidity, vapor pressure, atmospheric pressure, wind direction, wind speed, ground temperature and air temperature. The result shows that the change of soil evaporation in winter of Harbin is the result of harmonization under the combined effect of many influential factors, and ground temperature, air temperature, vapor pressure and atmospheric pressure are the main factors. The research achievements can provide reference for making irrigation program of Harbin.