Effect of Bacillus subtilis hs032 on Physicochemical Properties and Dispersal Capacity of Saline Soil
In this experiment,a high extracellular polysaccharide-producing Bacillus subtilis strain hs032(NCBI accession number:OM339850)isolated from saline soil,was mixed well with saline soil under 5 microbial application levels(5,7,9,15 and 20 mL/kg)and incubated indoor to investigate the effects on soil physicochemical properties and dispersal capacity.The results showed that the addition of microbial strains hs032 significantly increased soil microbial content and polysaccharide content compared with the control group(P＜0.05).At the end of the experiment(30 d)soil agglomerate mass increased by 7.2 g/kg on average,bulk density decreased by 31％on average,porosity increased by 11.8％on average,soluble salt content decreased by 41.5％,and pH decreased to between 7.16 and 7.41.Addition of strain hs032 shifted the soil penetration curve to the right,increased the soil pore water flow rate and decreased the diffusion coefficient.In conclusion,Bacillus subtilis hs032 can significantly improve soil physicochemical properties and water-salt transport,thus has certain practical application value for saline soil treatment.
Soil microorganismsExtracellular polysaccharidesSoil physical and chemical propertiesSoil dispersion coefficientPenetration curve
国家科技期刊平台
NSTL
万方数据
