枯草芽孢杆菌hs032对盐碱土理化性质及弥散能力的影响
Effect of Bacillus subtilis hs032 on Physicochemical Properties and Dispersal Capacity of Saline Soil
郭彦钊 1巨秦伟 1于烽 1黄敏刚 1齐飞1
作者信息
- 1. 陕西师范大学微生物工程与技术研究院,西安 710119
- 折叠
摘要
为了探究微生物对盐碱土壤理化特性及溶质弥散能力的影响,以一株分离自盐碱土的高产胞外多糖枯草芽孢杆菌(Bacillus subtilis)hs032为试验对象,设置5个施用水平(5、7、9、15和20mL/kg)开展了室内培养试验.结果显示:相较对照组,菌株hs032能够显著提高土壤微生物和多糖含量(P＜0.05);试验结束时(30 d)土壤团聚体含量平均增加7.2 g/kg,容重平均降低31％,孔隙度平均升高11.8％,可溶性盐含量下降41.5％,pH下降至7.16～7.41.添加菌株hs032会使土壤的穿透曲线右移,土壤孔隙水流速增高,弥散系数降低.总之,枯草芽孢杆菌hs032能够明显改善土壤理化性质和水盐运移参数,对盐碱土壤治理工作具有一定的实际应用价值.
Abstract
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.
关键词
土壤微生物/胞外多糖/土壤理化特性/土壤弥散系数/穿透曲线Key words
Soil microorganisms/Extracellular polysaccharides/Soil physical and chemical properties/Soil dispersion coefficient/Penetration curve引用本文复制引用
基金项目
榆林市盐碱地治理技术开发项目(2020064)
出版年
2024
国家科技期刊平台
NSTL
万方数据