农业工程学报2017，Vol.33Issue(18)：95-101,7.DOI:10.11975/j.issn.1002-6819.2017.18.013
解钾细菌C6X对不同富钾矿物含量土壤钾素迁移的影响
Effects of potassium-solubilizing bacteria C6X on potassium migration in soils with different content of potassium-rich minerals
摘要
Abstract
There is the severe agricultural environmental problem of cultivated soil potassium leaching caused by soil erosion in Loess Plateau,where the soil quality is rapidly degenerating caused by coal mining for a long time.It is necessary to rationally develop and utilize soil potassium in Loess Plateau for ecological restoration in the mining area of northwest China.In order to understand the effect of potassium-solubilizing bacteria C6X on soil potassium migration under the conditions of maize (zea mays) planted in the mining area of northwest China,this study was performed by short-term pot cultures in helio-greenhouse with or without maize planting in artificial soils with different contents of potassium-rich minerals which simulated the soils in the studied area.The artificial soil was composed of quartz and two kinds of potassium-rich minerals,including feldspar and hydrous mica which are common minerals in the soil of northwest mining area in China.The artificial soils used in the experiment were treated with six levels of potassium-rich minerals,which were 18％,25％,38％,45％,68％ and 75％ by mass fractions of total potassium-rich minerals in soils.Each level of potassium-rich minerals treated with inoculation with active C6X or sterilized C6X.The C6X is the tested strains of potassium-solubilizing bacteria Phyllobacterium ifriqiyense which was isolated from the garden soil in Beijing suburbs by microbial reclamation laboratory in China University of Mining and Technology.Also,nylon mesh (30μm,dia.) was laid at 20 cm depth below the soil surface to block the downward growth of the root system of maize.We investigated to the relationship among the potassium-solubilizing bacteria,potassium-rich minerals ratios in soils and the growth of maize,and the synergistic effect of them on the soil potassium migration,which included the increment of available potassium in topsoil and subsoil,the increment of slowly available potassium in topsoil and subsoil,and the upward migratory available potassium.Also,linear regression analysis was used for data analysis which involving potassium accumulation in maize and upward migratory available potassium in soils with active C6X or sterilized C6X.The results showed that:1) With maize planting,potassium-solubilizing bacteria increased available potassium in the soil with 45 ％ potassium-rich mineral mass fraction.Without maize planting,potassium-solubilizing bacteria significantly (P＜0.05) increased soil available potassium in the soil with 18 ％ or 25 ％ of the mass fraction of potassium-rich minerals.2) Potassium-solubilizing bacteria and maize growth synergistically increased potassium fixation capacity in topsoil due to more potassium released from minerals and used by maize.Soil slowly available potassium increment was the maximum value in the soil with 68 ％ mass fraction of potassium-rich minerals.Without maize planting,potassiumsolubilizing bacteria significantly (P＜0.05) improved soil slowly available potassium in the soil with 45％ mass fraction of potassium-rich minerals.3) Potassium-solubilizing bacteria and maize growth synergistically promoted ability of potassium translocation in soil.The upward migratory available potassium was to the maximum value in the soil with potassium-rich mineral mass fraction of 45％.Also,potassium-solubilizing bacteria promoted a linear relation between upward migratory available potassium in soil and potassium accumulation in maize,which has implication for the long-term management of soil potassium.In addition,the factor of potassium-rich mineral content in soils had no directly effect on soil potassium migration,but it could affect the metabolism of potassium bacteria at various degree,through which it finally could affect the soil potassium migration.To generalize,potassium-solubilizing bacteria and maize growth synergistically promoted soil potassium migration,and this is of great significance for the rational use of potassium-solubilizing bacteria to repair the ecological environment of the coal mining subsidence area in the Loess Plateau of Northwest China.关键词
土壤/细菌/钾素/黏土矿物Key words
soil/bacteria/potassium/clay minerals分类
资源环境引用本文复制引用
尚海丽,毕银丽,彭苏萍,解文武..解钾细菌C6X对不同富钾矿物含量土壤钾素迁移的影响[J].农业工程学报,2017,33(18):95-101,7.基金项目
国家自然基金项目(51574253) （51574253）
国家863计划项目(2013AA102904) （2013AA102904）
内蒙古科技大学创新基金项目(2015XYPYL04) （2015XYPYL04）
