半干旱区春小麦品种竞争能力与产量关系的研究

 采用de Wit替代系列法研究了黄土高原半干旱雨养农业区传统地方品种(和尚头)与现代品种(陇春8275)之间在混播条件下的竞争结局。在单播条件下现代品种较之地方品种具有更高的产量；但在混播条件下，和尚头具有明显的竞争优势。本项研究结果说明竞争优胜者并非是单播条件下产量性能更佳的品种，即作物品种的竞争能力与生产性能之间存在着负相关关系。形成这种关系的主要原因在于作物群体内个体竞争选择的方向与人类农业生产追求的目标不一致。

A STUDY OF THE RELATIONSHIP BETWEEN COMPETITIVE ABILITY AND PRODUCTIVE PERFORMANCE OF SPRING WHEAT IN SEMI ARID REGIONS OF LOESS PLATEAU

The relationship of competitive ability and productive performance between land race Monkhead and modern variety 8275 of spring wheat in semi arid area of Loess Plateau was invested using de Wit replacement series.It is shown that the modern variety 8275 was more productive than the land race Monkhead when planted in monoculture,but when sowed in mixture the modern variety 8275 will be eliminated in a few generations. There is a kind of negative correlation between competitive ability and productive performance in crop varieties.The reason might be that the land race allocates more resources to the vegetative organs than the modern variety of spring wheat,thereby conferring a higher competitive ability on it.