Light-response curves and root extract bioassay of five medicinal plants
The analysis of light-response parameters and the results of root extract bioassay for Anemarrhena asphodeloides,Platycodon grandiforus,Atractylodes macrocephala Koidz.,Isatis indigotica Fort.and Salvia miltiorrhiza Bge.were used to select medicinal plants for poplar understory planting.The results showed that the shade tolerance of Anemarrhena asphodeloides,Platycodon grandiforus,Atractylodes macrocephala Koidz.and Salvia miltiorrhiza Bge.was relatively strong,while that of Isatis indigotica Fort.was relatively weak.The al-lelopathy of Anemarrhena asphodeloides,Isatis indigotica Fort.and Salvia miltiorrhiza Bge.were relatively strong,while that of Platycodon grandiforus and Atractylodes macrocephala Koidz.were relatively weak.On the whole,Anemarrhena asphodeloides,Isatis indigotica Fort.and Salvia miltiorrhiza Bge.were more appropriate for poplar understory planting.According to the different growth periods of poplar,the appropriate medicinal plant was selected to achieve efficient and sustainable poplar agroforestry management.