密度对垄沟覆膜集雨冬小麦产量的影响

通过大田试验研究了垄沟覆膜集雨种植模式中，冬小麦种植密度对产量的影响。试验设有一种类型的垄沟覆膜集雨，其沟宽和垄宽均为60 cm，有高、中、低3种种植密度，高密度每沟种植4行，中密度每沟种植3行。结果表明:垄沟覆膜集雨具有促进冬小麦生长和增加产量的作用。垄沟覆膜集雨在低密度条件下的单株分蘖数、地上生物产量和产量都最高。垄沟覆膜集雨中密度和高密度条件下，种内竞争激烈，易导致中行小麦分蘖死亡较多，使中行的成穗率降低，这也是垄沟覆膜集雨中密度和高密度冬小麦产量较低的主要原因。

The Influence of Population Density of Winter Wheat of Plastic Film Mulching on Ridge for Rainwater-harvesting on Yield

Field experiments were carried out to study the influence of density on yield of winter wheat in different ridges mulched with plastic film for rainwater-harvesting. There was one type of plastic film mulching on ridge for rainwater-harvesting, which had the furrow width and ridge width of 60 cm. Three planting densities of high, middle and low level were used in the plastic film mulching on ridge for rainwater-harvestings. There were four, three and two lines wheat planted in the furrow in the high, middle and low planting density, respectively. The results showed that the rainwater-harvesting played the role in promoting the rapid growth of wheat and making the production of wheat to increase. In the low population density, the number of tillering, the aboveground biomass and the seed yield were the highest in the plastic film mulching on ridge for rainwater-harvesting. In the middle and high population density, there had an intensive competition, which resulted in the death of more tillers in middle lines, and the low percentage of tillers, and which was also the main reason for the lower yield in these practices.