玉米秸秆低温高效降解复合菌系GF-20的粉剂配方及其降解效果研究

为明确不同配方对复合菌系GF-20活性的影响,提高复合菌系的保存稳定性和施用便利性,以复合菌系GF-20为对象,采用滤纸条法研究不同载体及其不同负载量对生物相容性的影响,采用失重法测试粉剂产品的秸秆降解效果。结果表明：采用硅藻土做载体时,菌剂的滤纸降解能力最高,进一步研究发现其最佳负载比为2:1（菌液体积：载体质量,mL: g）,在此条件下制成的菌剂在低温(10℃)下的玉米秸秆降解率比对照高9.5%,且二者之间存在显著差异,从显微镜观察发现,菌剂处理后秸秆表皮出现明显缺刻和断裂。以上研究表明复合菌剂GF-20粉剂在低温条件下具有较好的秸秆降解能力,可促进北方高寒地区玉米秸秆降解速率。

Composite Microbial System GF-20 Degrading Corn Stalk: Powder Formulation and Degradation Effect

The study aims at revealing the effect of different formulations on the activities of composite microbial system GF-20, and improving its storage stability and the convenient application. The composite microbial system GF-20 was used as research object to study the effect of carriers and capacity on biocompatibility with the method of filter strip, and weight-loss method was used to test the stalk degradation of powder product. The results showed that, the powder with diatomite as carrier had the highest ability of filter paper degradation. Further research showed that the optimum capacity of carrier was 2:1 (volume of GF-20: weight of carrier, mL: g). The product prepared with such formulation showed 9.5% higher degradation percentage of corn stalk than that of control under low-temperature (10℃), and there was significant difference between them. Under microscope, significant incision and breakage were observed on stalk epidermis treated with dustable powder. These results indicate that GF-20 powder has good ability of corn stalk degradation under low temperature, and it could improve the corn stalk degradation rate in northern cold region of China.