模拟降雨条件下旱作区不同覆膜方式蓄积效应研究—以内蒙古阴山北麓地区为例

The Study of Accumulation Effect of Different Modes of Plastic Mulching under the Condition of Simulated Rainfall in Dry Area—Take the Area of the Northern Foot of Yin Mountain in Inner Mongolia as an Example

在内蒙古阴山北麓地区进行模拟降雨试验,研究不同模拟降雨量下不同覆膜方式的雨水蓄积效应。研究结果表明:垄作全覆膜的集雨效果最好,且对于沙壤土,垄作全覆膜比对照处理的贮水量提高1.09%~4%;对于粘壤土,垄作全覆膜贮水量比对照处理的贮水量提高2.26%~8.46%。在降雨强度为20 mm?h?1前提下,垄沟覆膜处理在雨量达到20 mm后,集雨效果下降明显。由于垄作全覆膜的抑蒸和集雨作用,使有限降雨集中在沟内种植区,起到蓄墒保墒的作用。

The simulated rainfall experiment was carried out in the area of the northern foot of Yin Mountain in Inner Mongolia;the accumulation effect of different modes of plastic mulching under different simulated rainfall of rainwater was studied. The results show that: the catchments effect of full plastic mulching is the best, and for the sandy loam, the moisture storage of full plastic mulching increases by 1.09% - 4% than control treatments;for clay loam, compared with treatment ,the moisture storage of full plastic mulching increases by 2.26% - 8.46%. When the rainfall intensity is 20 mm?h?1 and rainfall in gully with plastic mulching reaches 20 mm, catchments effect is significantly lower. Because of the effect of evaporation-inhibiting and water conservation of FPRFM, the limited rainfall is concentrated in gully area, which plays a role in moisture storage and moisture conservation.