5 | CONCLUSIONS
When S. miltiorrhiza is subjected to different abiotic stress conditions, changes occur in the soil enzyme activity that is secreted by its root system, altering the soil nitrogen cycle, phosphorus transport and utilization, and the antioxidant capacity of the rhizosphere. Plants obtain nutrients and reduce oxidative damage to roots by altering the levels of soil enzymes secreted by roots. Unfavorable environments can directly affect plant growth and development, affecting the amount of organic matter that plants put into the soil, thereby affecting soil carbon storage.