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以能分泌大量黏多糖的三赞鞘氨醇单胞菌(S.sanxanigenens)为试验菌株,以沙土、壤土和粘土为试材,采用摇瓶发酵获得高黏度菌剂,将其稀释后喷洒于土壤表面形成一层生物结皮,研究菌剂对不同质地土壤保肥和保水能力的影响。结果表明:三赞鞘氨醇单胞菌生物结皮形成后,壤土、沙土和粘土的持水能力比对照提高67.6%、27.3%和20.7%;淋溶试验后表面有结皮的粘土铵态氮流失减少83.3%,磷肥流失减少61.1%,钾肥流失减少75.0%;生物结皮对壤土和沙土保持养分的能力也有明显提高。
Using S.sanxanigenens, which can secrete a large amount of mucopolysaccharides, as test strain, sandy soil, loamy soil and clay were used as materials to obtain high-viscosity antibacterial agents by shake flask fermentation. The diluted strains were sprayed on The surface of the soil forms a layer of biological crust to study the effect of the antibacterial agent on soil conservation fertility and water retention capacity of different textures. The results showed that the water-holding capacity of loam, sand and clay increased by 67.6%, 27.3% and 20.7% compared with the control after Sphingomonas aeruginosa formed. After the leaching test, Nitrogen loss decreased by 83.3%, phosphorus loss decreased by 61.1%, and potassium loss decreased by 75.0%. Biological crusts also significantly improved their ability to retain nutrients in loam and sand.