基于土壤碳循环的丹参连作障碍机制研究

目的:通过测定丹参连作土壤呼吸速率,揭示丹参连作土壤碳循环变化规律,为解决丹参连作障碍提供新思路。方法:采用土壤碳通量测量系统测定丹参不同连作年限地块土壤呼吸速率和土壤温湿度,分别考察丹参连作与土壤呼吸及土壤温度、湿度的相关性。结果:丹参土壤呼吸速率随种植时间增加而降低,不同连作年限地块的土壤温度差异无统计学意义,但各地块间土壤湿度存在显著差异。结论:丹参连作使根际微生态系统土壤呼吸减弱,对土壤碳循环过程具有抑制作用。

Mechanism of Continuous Cropping Obstacle of Salvia miltiorrhiza Based on Soil Carbon Cycle

Objective At present, with the increase of demand, Salviae Miltiorrhizae Radix et Rhizoma is mainly derived from cultivated Salvia miltiorrhiza. However, continuous cropping obstacle is a serious problem in the cultivation of S. miltiorrhiza, which hinders the sustainable development of this industry. In this study, we measured respiration rate of soil with continuous cropping of S. miltiorrhiza, aiming at revealing the changes law of the carbon cycle in soil with continuous cropping of S. miltiorrhiza and provide methods to tackle the obstacle.Methods The open-circuit soil carbon flux measurement system was used to measure the respiration rate, temperature, and humidity in soil of plots with continuous cropping of S. miltiorrhiza, and the relationship of continuous cropping with soil respiration, temperature, and humidity was analyzed.Results Soil respiration rate decreased over time. The difference in soil temperature was insignificant among plots of different continuous cropping years but the difference in soil humidity was significant among plots.Conclusion Continuous cropping of S. miltiorrhiza weakens soil respiration of the rhizosphere micro-ecosystem and inhibits the soil carbon cycle.