Research on the Mechanism of Continuous Cropping Obstacles in Strobilanthes sarcorrhiza

Strobilanthes sarcorrhiza is a plant with unique ecological value and medicinal potential. Its physiological characteristics and interactions with microbial communities have always been the focus of research. This study delved into the impact of continuous cropping on the growth of S. sarcorrhiza, meticulously analyzing the changes in its physiological indices, soil components, and microbial composition. By examining samples of S. sarcorrhiza that had been continuously cropped for three years (Bad group) and those planted for one year (Good group), it was discovered that continuous cropping led to soil nutrient imbalance. Specifically, the nitrogen supply decreased, the availability of potassium declined, and the content of available phosphorus increased substantially. The reduction in soil enzyme activity impeded nutrient transformation. Moreover, continuous cropping altered the microbial diversity and community structure. The beneficial bacteria and fungi decreased, while the harmful ones increased. Among bacteria, the relative abundances of Gemmataceae and Ktedonobacteraceae decreased, affecting organic matter decomposition and soil structure. In fungi, the relative abundance of Ascomycota increased significantly, raising the likelihood of diseases in S. sarcorrhiza. The continuous cropping obstacle emerged in the third year. It is essential to take measures before this to comprehensively regulate the soil environment and microbial community, thereby alleviating the continuous cropping obstacle. The findings of this study offer a scientific basis for the rational planting and sustainable utilization of S. sarcorrhiza.