微生物菌剂对盐碱土理化和生物性状影响的研究

采用盆栽试验方法,研究了微生物菌剂对盐碱土壤微生物、养分、盐分及玉米苗期生长的影响。结果表明,施用微生物菌剂后,盐碱土壤中钾细菌和枯草芽孢杆菌数量、土壤有机质含量、速效N、P、K含量状况均明显高于无添加菌剂对照处理,其中以菌剂施用量为0.4g·kg^-1土的效果最明显。施用微生物菌剂后,土壤pH、含盐量均有不同程度地降低,菌剂施用量0.4g·kg^-1土的处理在前中期表现出较好的土壤脱盐效果,而菌剂施用量0.8g·kg^-1土的处理在后期脱盐效果较好。添加微生物菌剂促进玉米苗期株高和叶片数增加,有利于玉米地上部分干物质的积累,以菌剂施用量0.4g·kg^-1土的效果最明显。差异显著性检验表明,菌剂处理玉米株高、干物质重与无添加菌剂对照相比差异均达显著水平,但不同菌剂量处理间差异不明显。综合判定菌剂施用量0.4g·kg^-1土对盐碱土理化和生物性状改良效果较好。

Effects of Inoculating Different Microorganism Agents on the Improvement of Salinized Soil

The effects of inoculating microorganism agents on the soil microorganism, total salinity and corn growth in seedling state were studied with a pot experiment. The results showed that compared with the treatments without inoculating microorganism agents, the treatments applying inoculating microorganism agents resulted in a significant increase in the amount of soil potassium silicate-degrading bacteria and Bacillus subtilis, soil organic matter content and soil available nutrients including nitrogen, phosphorus and potassium in surface soil. It was also found that the effect of treatment applying inoculating microorganism agents of 0.4 g· kg^-1 soil on soil potassium silicate-degrading bacte- ria and bacillus subtilis, soil organic content and soil available nutrients was most significant. The total salinity content and pH in the topsoil layers were decreased by applying inoculating microorganism agents. The treatment applying inoculating microorganism agents of 0.4 g· kg^-1 soil presented a better soil desalinization effect in the earlier and middle periods, whereas the treatment applying inoculating microorganism agents of 0.8 g ·kg^-1 soil showed a better effect in the later period. In addition, applying inoculating microorganism fertilizers increased the corn height, leaf number and dry matter weight in seedling stage, but no significant difference between treatment inoculating microorganism agents of 0.4 g· kg^-1 soil and 0.8 g· kg^-1 soil was found in the corn height and dry matter weight. In general, the treatment applying inoculating microorganism agents of 0.8 g·kg^-1 soil was the best among all treatments.