可降解地膜对棉田土壤温湿度的影响

Effect of Degradable Films on Cotton Soil Temperature and Humidity

为明确可降解地膜对土壤温湿度的影响,以比较其保温保墒性能与普通PE膜的差别,本文采用随机区组试验设计,比较铺设不同降解膜的条件下土壤温湿度的变化。结果表明,铺设地膜对棉花影响主要表现在提高土壤温度上,降解膜只要在头水前保证不破裂,可增加土壤温度,促进棉花生长,其保温性能与普通PE膜差别不大。在灌溉开始后,降解膜开始降解,保墒性能下降,但通过调节灌溉频率,降解膜对土壤含水率的不利影响可以消除。

In order to clarify the effect of biodegradable mulch on soil temperature and humidityandcompare its performance of soil moisture insulation with ordinary PE film,the randomized block design in this paper was used,and the change of soil temperature and humidity under the conditions of degradation films and PE films were studied. The results showed thatthe effect of laying mulch on cotton was mainly to improve the soil temperature,the degradable film which did not rupture before the first irrigation couldincrease soil temperature and promote the growth of cotton,its insulation properties with ordinary PE film was not very different. After irrigation began,degradable film was to degrade,soil moisture performed degradation,but by adjusting the irrigation frequency,the adverse effects of degradable film on soil moisture could be eliminated.