关键词: 间作比例, 燕麦, 蚕豆, 光合特性, 地上生物量, 灰色关联度分析

Abstract: To investigate the effects of intercropping systems between oat (Avena sativa L.) and broad bean (Vicia faba L.) in high-altitude and cold regions on crop photosynthetic characteristics and aboveground biomass,this study used oat monoculture and broad bean monoculture as reference,and set up 7 planting modes of oat intercropping with broad bean,namely:1∶1 (YD11),2∶1 (YD21),2∶2 (YD22),3∶1 (YD31),and 3∶2 (YD32),to study the growth indicators,photosynthetic characteristics,and aboveground biomass of the two crops. The results showed that intercropping promoted the growth and development of oats,but to some extent limited the growth of broad beans. Intercropping improved the net photosynthetic rate,transpiration rate,stomatal conductance,and intercellular CO₂ concentration of oats,and significantly increased the plant height,stem diameter,leaf length,leaf width,and aboveground biomass of oats. However,after intercropping the broad beans,except for plant height,had overall lower growth indicators,photosynthetic indicators,and aboveground biomass than the monocultured. Grey correlation analysis shows that YD11 treatment performed well,ranking first in the weighted correlation degree during the flowering period of oats and second at the milky stage of oats. Therefore,it is recommended to promote the oat broad bean intercropping system in high-cold areas with a intercropping ratio of 1∶1.

Key words: Intercropping ratio, Oats, Broad bean, Photosynthetic characteristics, Aboveground biomass, Grey correlation analysis