Research progress on causes of soil continuous cropping obstacles by saponins accumulation and alleviating mechanisms of biochar remediation
Continuous cropping obstacles caused by saponins have become one of the important factors restricting the sustainable development of the medicinal plant industry and land resource management.The current methods for remedying soils with continuous cropping obstacles include biological control,crop rotation and intercropping,and soil disinfection.However,all the methods can't fundamentally regulate the saponins secreted by plants and accumulated in soil,and the continuous cropping obstacle would still recur.Biochar,as a low-cost and excellent-performance soil remediation material,has a good prospect in the remediation of soil with continuous cropping obstacles.In this paper,how saponins induce continuous cropping obstacles through allelopathy,allelopathic-autotoxicity,and deterioration of soil microhabitats were reviewed.Biochar had the potential to remediate and alleviate the continuous cropping obstacles by adsorbing accumulated saponins in the soil,improving the plant growth conditions,optimizing the soil microorganisms,regulating the secretion of saponins by plants,and reducing the incidence of soil-borne diseases.Finally,the reducing agent-modified biochar,an effective technique for the prevention and control of continuous cropping obstacles caused by saponin accumulation was proposed.The preparation and application of modified biochar and its possible environmental risks were explored to provide theoretical support for overcoming continuous cropping obstacles of medicinal plants.
万方数据
维普
