耐盐碱类芽孢杆菌C1对苏打盐碱土团聚体的影响

Effects of Saline-alkali Tolerant Paenibacillus sp.C1 on Aggregates of Soda Saline-alkaline Soil

苏打盐碱土团聚体的分散度高,不利于有机质及其他营养物质的转化、活化及维持,严重影响作物的生长。从土壤团聚体的组成、物理化学性质及生物学性状等角度研究了1株耐盐碱类芽孢杆菌C1对苏打盐碱土的改良作用。结果表明:菌株C1单独作用于苏打盐碱土,增加了不同粒级团聚体多糖和有效磷的含量,降低了土壤pH。但菌株C1与水稻秸秆、硫酸铵和磷酸钙共存条件下,使>0.25 mm粒级土壤团聚体增加4.13%;>0.25 mm和0.25~0.053 mm粒级团聚体在水中的失重率分别减少了2.65%和3.58%,稳定性明显增加;>0.25 mm,0.25~0.053 mm和<0.053 mm粒级团聚体多糖含量分别提高了35.86%,38.46%和31.23%;总有机碳含量分别增加了35.69%,36.78%和25.44%;有效磷含量分别增加了36.44%,29.49%和38.72%;有机磷含量分别显著增加了44.97%,41.37%和39.26%;碱性磷酸酶活性分别显著增加了26.11%,22.59%和25.71%,达显著水平;>0.25 mm和0.25~0.053 mm粒级土壤团聚体的水溶性有机碳占总有机碳比例分别增加了6.14%和3.58%,降低了离子态碳的含量。综上,菌株C1与水稻秸秆、硫酸铵和磷酸钙复合改良在苏打盐碱土改良方面具有重要的应用价值。

High dispersion of soda saline-alkali soil aggregates is not conducive to the transformation,activation and maintenance of organic matter and other nutrients,and seriously affects the growth of crops.In this paper,the improvement effect of a salt-tolerant Bacillus C1 on soda salinealkaline soil was studied from the perspectives of soil aggregate composition,physical and chemical properties,and biological characteristics.The results showed that strain C1 acted on soda salinealkaline soil alone,increasing the content of polysaccharides and available phosphorus in aggregates of different sizes,and lowering soil pH.However,the coexistence of strain C1 with rice straw,ammonium sulfate and calcium phosphate increased soil aggregates of>0.25 mm size by 4.13%;weight loss rates of aggregates of>0.25 mm and 0.25-0.053 mm sizes in water were reduced by 2.65%and 3.58%,indicating a significant increase in stability;Polysaccharide content of>0.25 mm,0.25-0.053 mm and<0.053 mm particle size aggregates increased by 35.86%,38.46%and 31.23%,respectively;Total organic carbon content increased by 35.69%,36.78%and 25.44%,respectively;Available phosphorus content increased by 36.44%,29.49%and 38.72%,respectively;Organic phosphorus content increased significantly by 44.97%,41.37%,and 39.26%;alkaline phosphatase activity increased significantly by 26.11%,22.59%and 25.71%,respectively,reaching significant levels;Ratio of water-soluble organic carbon to total organic carbon in soil aggregates of>0.25 mm and 0.25-0.053 mm sizes increased by 6.14%and 3.58%,respectively,reducing the content of ionic carbon.The above results show that the composite improvement of strain C1 with rice straw,ammonium sulfate and calcium phosphate has important application value for the improvement of soda saline-alkaline soil.