全膜双垄沟播栽培对自然降水再分配规律研究

在平坦地块中测定了陇东雨养农业区全膜双垄沟播玉米田对自然降水的再分配规律,比较分析了玉米3种栽培方式对自然降水的有效入渗效应。结果表明,全膜双垄沟播玉米田对自然降水的汇集效果可达到72.46%～87.95%,但在降水量少于1mm和2月份的低温、冰冻、降雪等状况下降水汇集效果较差;对自然降水的降水入渗效果可达到61.44...

Natural Precipitation Redistribution in the Cultivation of Whole Plastic-film Mulching on Double Ridges Ditch Sowing

In the study,we determined the redistribution of the natural precipitation in the flat blocks of the rain fed agricultural region of east Gansu Province for corn fields,and analyzed and compared the effects on the effective infiltration of natural precipitation in the corn's three kinds of cultivation.The results showed that: The effects of the natural precipitation's collection was 72.46%～87.95% in the cultivation of whole plastic-film mulching on double ridges ditch sowing,but it was poorer in the process of light snow and rain and the precipitation was lower than 1mm,and it also was affected on the low temperature,frozen and snowfalls in February;The effects of the natural precipitation's infiltration was 61.44%～80.06%,but it had great influence by the process of light snow and rain,and torrential rain,it was also affected on the low temperature,frozen and snowfall in February and high temperature and drought in June and July.The cultivation of the whole plastic-film mulching on double ridges ditch sowing would make more precipitation that would be accepted to infiltrate into the small region where the plant roots could directly use(the layer of lower than that the seeding hole),and the precipitation's infiltration of the per unit area was respectively increased by 11.76～43.30 times and 52.60～229.77 times than the culture of half plastic-film mulching on the ridge and the open field.The water would infiltrate more deeply,but the total amount of the main distribution area where the plant roots would use the infiltration was not much higher than the cultivations of the other two kinds.