关键词: 病原真菌, 病原真菌, 短小芽孢杆菌属, 鉴定

Abstract: This study was conducted to explore the effects of different sowing dates on light utilization and yield of Platucodon gradiflorum canopy structure and to reveal the efficient utilization modes of different sowing dates, and finally to provide the basis for establishment and improvement of P. gradiflorum cultivation techniques. In this text, the LP-80 plant canopy analysis was adopted. The canopy photosynthetically active radiation, interception rate, conversion rate and use efficiency of P. gradiflorum under both the spring sowing and the summer sowing were investigated, and the agronomic traits of its overground part and root segment were also compared to do correlation analysis. The results of the experiment were shown as follows: (1) at the harvest time that year, although the spring sowing had the advantage of higher plant height and longer taproot, it had the disadvantage of more severe aging and falling off of leaf blade, higher transmittance of canopy structure and lower solar energy utilization; the summer sowing still had a stronger photosynthetic capacity although the reflection loss of canopy structure was severe. (2) The spring sowing had higher yield and better root type, which was suitable for use as one year of medicinal cultivation, and P. gradiflorum could be dug in the end of October; for the summer sowing, the canopy radiation utilization remained at a higher level in mid to late October, which was suitable for use as two years of food cultivation.