Effects of biochar addition on perilla growth and the rhizosphere microbial community under salt stress
A pot experiment was conducted to assess the effects of biochar application on the physical and chemical properties of saline soil and the growth of Perilla frutescens under different levels of salt stress(0,2‰,4‰,and 6‰ mass fraction of saline soil)with varying addition rates of biochar(0,1%,and 3% carbon mass fraction of soil).The soil nutrients,soil structure,soil microbial community,yield,and quality of perilla were analyzed.The results showed that biochar application increased perilla plant height,dry-to-fresh weight ratio,photosynthetic pigment content,soluble protein content,and total soluble sugar content under salt stress.Soil organic matter,total nitrogen,and quick-acting potassium contents reached the highest levels under 3% biochar treatment.Soil pH and maximum water holding capacity were increased after biochar application(P<0.05).Moreover,soil EC and unit weight decreased significantly(P<0.05).However,biochar application significantly(P<0.05)increased soil enzyme activities at 2‰ salt stress level.Furthermore,the number of OTU and shannon index showed that microbial diversity was increase under 3% biochar application rate.The abundance and diversity of soil microorganisms,such as phylum Proteobacteria and Actinobacteriota,under salt stress significantly(P<0.05)increased with increasing biochar application rate.The relative abundance of Chloroflexi increased with increasing biochar application rate.The phyla Actinobacteriota was significantly(P<0.05)positively correlated with soil EC,and significantly negatively(P<0.05)correlated with effective phosphorus,total nitrogen,quick-acting potassium,organic matter,and soil pH.It was concluded that the application of biochar could improve the physicochemical properties of soil such as soil EC and bulk density thereby alleviating root salt stress and enhancing the height and dry-to-fresh weight ration of purple perilla.The application of biochar also increased soil enzyme activity and enhanced the diversity of soil microbial communities,further improving the rhizospheric environment of purple perilla,leading to an enhancement in the quality of the plant.
biocharPerilla frutescenssaline soilphysical and chemical propertymicroorganism
万方数据
维普
