沙地衬膜对土壤温度的影响

通过对景电灌区衬膜沙地与不衬膜沙地土壤温度的变化规律及二者温度差异的观测分析表明：沙地衬膜后生长期土壤温度的月平均值、日平均值及各层次平均值均比不村膜沙地有所下降。在观测期内（5月27日～6月30日），衬膜地日平均土温比对照地降低7.4℃，在地表层及地下5cm、10cm、15cm、20cm和25cm深处，衬膜地比对照地土温平均下降8．2℃、6．9℃、6．0℃。60℃、5．6℃和5．4℃，但衬膜地土壤温度变化趋于缓和，在生长期（6月份），衬膜沙地日温差、月温差及上下层之间的温差比对照地分别减小49℃、5．0℃和28℃。

Effect of the film-bottomed sandy land on the soil temperature

Based on observation and reseach on the soil temperature in the film-bottomed and non-film-bottomed sandy land in the Eleconic-irrigated Area of Jingtai Plain, the results showed.the mean soil temperatures of day and month,including the mean temperature in different soil layers in the film-bottomed sandy land were all lower than the contras (non-film-bottomed sandy soil). During the observation (2715 ~30/6) period, the day mean temperature, the temperature of the surface ground and the underground deepth of 5 cm, 10 cm, 15 cm, 20 cm, 25cm was 7.4℃, 8.2℃, 6.9℃, 6.0℃, 6.0℃, 5.6℃, and 5.4℃ lower than the contrast, respectively.However, the soil temperature variation of the film-bottomed sandy land tended to be moderate.ln June, the mean soil temperature (including day month and the different soil layers) was 4.9℃,5.0℃, 2.8℃ lower than the contrast as well.