| 【Objective】The study was conducted to clarify the regulation effects of biochar on“tomato-soilmicrobial community”system under phenolic acid stress.【Method】Pot experiments were conducted to compare the
effects of biochar addition on tomato growth, physiological indices, tomato yield and quality, soil physicochemical properties
and soil microbial diversity under phenolic acid stress. Redundancy analysis was used to reveal the interaction mechanism
among the above factors.【Result】Compared with the treatment under exogenous phenolic acid stress, the application of 5% biochar could effectively alleviate the stress effect of phenolic acid on tomato plant growth, increase root activity and rootshoot ratio, the single plant yield and average weight of single fruit were increased by 15.2% and 4.3%, and ratio of sugar to acid
was increased by 32.0%. Compared with the phenolic acid stress treatment, the application of biochar increased soil pH by 0.59
units, decreased EC value by 21.9%, and the total phenolic acid content was reduced by 25.3% at harvest time. Redundancy
analysis results showed that biochar changed the four main soil environmental factors: pH, alkaline nitrogen, total nitrogen, and
total phenolic acid contents, then promoted the abundance of microorganisms positively related to tomato yield and quality, and
inhibited the abundance of those negatively related to tomato yield and quality.【Conclusion】Generally, biochar addition can
selectively promote or inhibit soil microbial community abundance related to tomato yield and quality by changing the soil pH,
nitrogen, total phenolic acid content and other physicochemical properties. Through the change of microecological environment
of rhizosphere soil, the stress effects of phenolic acid allelochemicals on tomato plants can be alleviated, hence achieving the
effects of promoting growth, increasing production and improving quality. |
