江苏丘陵区栎林土壤温度与水分特征

Soil Temperature and Moisture Content Characteristics of Oak Forests in Hilly Region in Jiangsu

为了揭示江苏丘陵区栎林内的小气候变化规律,利用土壤温度和湿度传感器测量不同层次土壤温度和水分,并对其时空变化进行分析。结果表明,从土壤温度日变化来看,4个层次土壤日平均温度冬季为40 cm>10 cm>0 cm>5 cm、春季为0 cm>5 cm>10 cm>40 cm、夏秋季为0 cm>40 cm>10 cm>5 cm;从土壤温度月变化来看,4个层次土壤温度呈倒U型变化,各层土壤月平均温度差异并不显著;从土壤温度季节变化来看,秋、冬两季随着土壤深度的增加,温度总体呈现上升的趋势,以冬季最为明显,而春、夏两季规律性不是很明显;从日、月、季节土壤温度变化幅度来看,温度变化幅度随着土壤深度的增加而减小,说明土壤越深,温度越稳定。从日、月、季节土壤水分来看,各层土壤水分变化都较稳定、变幅很小,各层土壤含水量随着土壤深度的增加而增加,水分变化的幅度随着土壤深度的增加而降低。

In order to reveal the change regularity of microclimate of oak forests,soil temperature and moisture content in different levels were tested by temperature and moisture content sensors,of which the time-space variation were analyzed.The results indicated that for daily variation,the average diurnal temperature in four soil levels ranked as 40 cm>10 cm>0 cm>5 cm in winter,0 cm>5 cm>10 cm>40 cm in spring,0 cm>40 cm>10 cm>5 cm in summer and autumn.For monthly variation,the temperature in the four soil levels shaped as inverted U,and the difference of average monthly temperature in different levels was not significant.For seasonal variation,the temperature increased with the depth of soil in winter and autumn,especially in winter;while the regularity was not obvious in spring and autumn.As for the daily,monthly and seasonal variation range,soil temperature variation range decreased with the depth of soil,indicating that the deeper the soil,the more stable the soil temperature.For daily,monthly and seasonal soil moisture content,it was stable in all soil levels with little variation.The soil moisture content increased with the depth of soil,while the variation range decreased.