旱作马铃薯微垄覆膜侧播栽培模式的集雨效果

Simulation Study on Rainwater Harvesting of Rainfed Potato Under the Cultivation Pattern of Micro Ridge Mulching with Side Planting

微垄覆膜侧播栽培模式是最近提出的旱作区马铃薯集雨栽培技术，研究的目的是通过设置5，10，15和20mm4个模拟降雨量水平，与传统平作模式进行比较以检验微垄覆膜侧播栽培模式在内蒙古阴山北麓地区的集雨效果。试验在马铃薯出苗后16d进行模拟降水处理。结果表明，在微垄覆膜侧播栽培模式下，5mm降雨即可显著提高马铃薯根际0～20cm土层土壤含水量，10mm时微垄覆膜侧播的贮水效果最好。随着模拟降雨量的增加，微垄覆膜侧播马铃薯的干物质积累速率、各器官干物质积累、叶面积指数及水分利用效率均呈现增加的趋势。

Micro ridge mulching with side planting is a rainwater harvesting cultivation pattern for the rainfed potato in arid area. This research aimed to quantify the rainwater harvesting effect of the micro ridge mulching with side planting by comparing with conventional flat planting under different simulated rainfall levels of 5, 10, 15 and 20 mm. Treatments were applied 16 days after emergence （DAE）. The results showed that from 5 mm of rainfall level, the micro ridge mulching with side planting pattern began to significantly improve the soil moisture content of 0-20 cm, with the best effect on soil water storage at 10 mm under simulated conditions. As the amount of rainfall increasing, the potato dry matter accumulation percentage, dry matter accumulation in various organs, leaf area index and water use efficiency also had a tendency to increase under the cultivation mode.