腐殖酸和植物促生芽孢杆菌对黑麦草抗逆性及砒砂岩土壤性状的影响

目的] 探究微生物在砒砂岩土壤修复工程中的作用，为微生物强化植物改良砒砂岩土壤的科学设想提供新思路。方法] 以黑麦草作为供试作物，通过室内盆栽模拟试验的方法，研究接种植物促生芽孢杆菌Bacillus halotolerans P75，施用腐殖酸肥料以及不同的菌肥搭配对水土流失严重的砒砂岩土壤理化性质及黑麦草生长和抗逆性指标的影响。结果] 与对照相比，Bacillus hallotolerans P75发酵液与腐殖酸协同处理显著提高了黑麦草叶片中SOD活性（229.7%）、POD活性（83.6%）和脯氨酸含量（119.3%），显著增加砒砂岩土壤中多糖、有机质、速效磷和速效钾含量，且土壤渗水率明显降低。结论] 植物促生芽孢杆菌Bacillus hallotolerans P75发酵液与腐殖酸肥料协同作用能够显著改善砒砂岩土壤的水分、养分流失问题，提高黑麦草的抗逆性，强化植物对砒砂岩土壤的改良和修复。

Effects of Humic Acids and Plant Growth-promoting Bacillus on Stress Resistance of Ryegrass and Characterstics of Feldspathic Sandstone Soil

Objective] The role of microorganisms in feldspathic sandstone soil remediation was explored, in order to provide new ideas for the scientific assumption of microbial enhanced plant improvement of feldspathic sandstone soil.Methods] Ryegrass was used as the test crop, and the effects of inoculating Bacillus hallotolerans P75, humic acid fertilizer and different combinations of bacterial fertilizer on soil physical and chemical properties, growth and stress resistance of ryegrass were studied by pot experiments.Results] Compared with the control, the synergistic treatment of Bacillus hallotolerans P75 fermentation broth and humic acid significantly increased the SOD activity (229.7%), POD activity (83.6%) and proline content (119.3%) in ryegrass leaves, significantly increased the contents of polysaccharide, organic matter, available phosphorus and available potassium and significantly reduced the soil water permeability in feldspathic sandstone soil.Conclusion] The synergistic effect of Bacillus hallotolerans P75 fermentation broth and humic acid fertilizer can significantly control the water and nutrient loss of feldspathic sandstone soil, improve the stress resistance of ryegrass, and strengthen the improvement and repair of feldspathic sandstone by plants.