天山中段雪岭云杉林浅层地温特征分析

Characteristics of Soil Temperature in Shallow Ground of Picea Schrenkiana forest in the Middle Area of Tianshan Mountain

森林地温与树木生长密切相关,对地温的研究有利于利用森林气象资料做好森林气象服务工作。本文利用新疆天山雪岭云杉林2009年的地温数据,分析不同深度地温的日变化、季节变化及年变化规律。结果表明:20 cm以上各层地温日变化均呈正弦曲线,近地表变化趋势明显,随着深度的增加,其变幅急剧减小;40 cm地温始终高于10 cm和20 cm地温;不同深度地温日变化的相位存在明显差异。夏季地温呈现随深度增加地温降低的垂直变化特征;冬季不同深度的地温呈现随深度增加地温升高的垂直变化特征。3月中旬至8月中旬,近地层的地温高于深层,而在8月中旬至翌年3月中旬,深层地温高于表层。

Soil temperature is one of the most important environmental factors in forest.The study of soil temperature will be helpful to the forest weather service.The ground temperature data of 2009 was used to analyze the characteristics of soil temperature at different depths of Picea Schrenkiana forest in Tianshan Mountain.The results showed that,it was a sine trend of soil temperature in each ground above 20 cm.The change tendency was obvious near surface,and its amplitude reduced suddenly along with the increase of depth.There was obvious difference of diurnal variation between different ground depths of soil temperature.The average of soil temperature was the highest in summer,and was the lowest in winter.The variation magnitude of soil temperature decreased with the increase of ground depth in summer,and it was the contrary in winter.The soil temperature of surface layer ground was higher than it of in-depth ground from Mid-March to Mid-August,and the soil temperature of in-depth ground was higher than it of surface layer from Mid-August to Mid-March of the next year.