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春小麦／春大豆间作是西北一熟制灌区广泛采用的高产种植形式．本文采用田间小区和微区根系分隔试验研究了这种种植形式作物种间的竞争作用和促进作用．结果表明，小麦／大豆间作具有明显的间作优势．土地当量比为１．２３～１．２６．小麦为优势种，竞争力强于大豆，具有明显的间作边行优势．小麦边行优势的１／３贡献来自于地下部．小麦收获后，大豆生长具有恢复作用，认为这种恢复作用是间作优势的机制之一．间作相对于单作两种作物的收获指数均有显著提高．收获指数的种间促进作用是间作优势的另一机制．
Spring wheat / spring soybean intercropping is a widely used form of high-yielding cultivation in the northwestern one-crop irrigation system. In this paper, field and district micro-regional segregation tests were conducted to study the competition effect and promotion effect of this cropping system. The results showed that wheat / soybean intercropping had obvious intercropping advantage. Land equivalent ratio of 1.23 ~ 1.26. Wheat is the dominant species, and its competitiveness is stronger than that of soybean, with the obvious advantage of intercropping. One-third of the contribution of wheat’s advantage to the edge comes from the basement. After the wheat harvest, soybean growth has a recovery effect, which is considered as one of the mechanisms of intercropping advantage. The harvest index of intercropping compared with monocropping both significantly increased. The inter-species promotion of harvest indices is another mechanism for inter-crop superiority.