关键词: 化感作用, 化感作用, 水浸提液, 红小豆, 萝卜, 白菜, 小麦

Abstract: In order to observe the spatial and temporal distribution characteristics of winter wheat canopy photosynthetic active radiation during filling period and the yield of winter wheat of jujube- wheat intercropping system, by taking Zizyphus Jujuba cv. Huizao and winter wheat‘Xindong 20’as the research objects, a split plot field experiment of two factors was designed with four types of planting spacing model in jujube-wheat intercropping system. The results showed that with the distance increase of jujube plants, the winter wheat canopy photosynthetic active radiation during filling period and the wheat yield increased constantly. At the same time, the increase range of the west side was greater than that of the east side, overall presented a trend of“middle high, both sides low”and“west side high, east side low”. The effective panicle number, grain number per spike, 1000-grain weight and yield of winter wheat per unit area showed significant differences. Compared with the monoculture, the fraction of shading and yield reduction rate of 3 m×4 m intercropping system were the lowest. Research showed that planting spacing was the main factor in the interception amount of winter wheat canopy photosynthetic active radiation. The interception amount of photosynthetic active radiation determined the effective panicle number, grain number per spike and 1000-grain weight of winter wheat per unit area, thereby determined the yield of winter wheat. In actual production, taking 3 m×4 m intercropping production model and increase the spacing of jujube trees in the eastern part appropriately could improve the lighting condition within the intercropping system and increase the yield of winter wheat effectively.