Replacement Control with Dolichos lablab Affects the Rhizosphere Soil Microenvironment of Phytolacca americana L.
This study aims to investigate the effects of replacement control with Dolichos lablab on the rhizosphere soil microenvironment of Phytolacca americana L.We measured the counts of bacteria,fungi,and actinomycetes and the content of total nitrogen,total phosphorus,total potassium,available nitrogen,available phosphorus,available potassium,and organic matter in the rhizosphere soil of the fields planted with P.americana L.alone or mixed with D.lablab at different proportions.The results showed that mixed cultivation with D.lablab significantly reduced the count of bacteria,count and proportion of actinomycetes,total microbial count,total phosphorus,available nitrogen,available potassium,and organic matter in the rhizosphere soil of P.americana L.,while it significantly increased the proportion of fungi.The mixed cultivation of P.americana L.and D.lablab at a ratio of 1∶3(S2L6)signi-ficantly decreased the proportion of bacteria,while the mixed cultivation at ratios of 1∶1(S4L4)and 1∶3(S2L6)significantly increased the count of fungi and significantly decreased the content of total nitrogen and available phosphorus.The correlation analysis showed that the microbial count and physicochemical properties in the rhizosphere soil interacted with each other.According to the comprehensive ranking of principal component analysis,we concluded that the mixed cultivation at a ratio of 1∶3 had the worst rhizos-phere soil fertility.In summary,the reduction of soil fertility in the rhizosphere of P.Americana L.by mixed cultivation indicated that D.lablab successfully controlled P.americana L..Moreover,the mixed cultivation of P.americana L.and D.lablab at a ratio of 1∶3 was most conducive to the replacement control of P.americana L..
Phytolacca americana L.Dolichos lablabreplacement controlmicrobial countphysicochemical properties of soil
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