Effects of Different Intercropping Methods on Mesona Chinesis Quality and Its Rhizosphere Soil Characteristic
[Objective]Exploring the impact of intercropping on the quality of Mesona chinensis and its mechanism of action,providing a theoretical basis for the development of high-quality cultivation techniques for Mesona chinensis.[Method]A field randomized block experiment was conducted,including three cropping systems,such as soybean/Mesona chinesi/corn intercropping(S/M/C),soybean/Mesona chinesi intercropping(S/M),and Mesona chinesi monoculture(M).The effects of different intercropping systems on the quality of Mesona chinensis and its rhizosphere soil characteristics were analyzed.[Result]The S/M/C and S/M intercropping were beneficial for promoting the accumulation of trace elements in Mesona chinensis leaves and stems,such as Ca(11.36%-24.20% in leaves and 33.44%-38.16% in stems),Mg(34.41%-52.00% in leaves and 15.20%-91.99% in stems),Fe(15.21%-15.46% in leaves),and Cu(17.19%-30.73% in stems).The S/M/C intercropping significantly increased the flavonoid content in the stems of Mesona chinensis by 44.42% .The two intercropping systems significantly reduced the nutrient contents of total nitrogen(TN),alkaline nitrogen(AHN),and available potassium(AK)in the rhizosphere soil of Mesona chinensis,which significantly improved the soil pH(4.82 in M,5.22 in S/M,and 5.51 in S/M/C).However,pH was the most important soil factor driving changes in bacterial community structure in this study.The S/M/C intercropping significantly improved the bacterial diversity in the rhizosphere soil of Mesona chinensis.The two intercropping systems significantly increased the relative abundance of the dominant bacterial genus Bacillus,from 3.24% (M)to 5.28% (S/M)and 8.09% (S/M/C),respectively.In addition,the S/M/C intercropping promoted the recruitment of more bacterial phyla,such as Bdellovibrionota,Dependentiae,WS2,as well as bacterial genera such as Metrocystis in the rhizosphere soil of Mesona chinensis.[Conclusion]The S/M/C intercropping could promote the accumulation of flavonoids in Mesona chinensis,which was beneficial for improving its quality.The improvement of soil pH might be the main factor driving the change of soil bacterial diversity and community structure in the S/M/C intercropping.The enrichment of specific bacterial phyla and genera in the rhizosphere soil of Mesona chinensis in S/M/C intercropping were beneficial for improving the biological characteristics of soil.Therefore,the reasonable intercropping such as S/M/C was an effective measure to achieve high-quality cultivation of Mesona chinensis.
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