复合菌系对玉米秸秆的降解特性

采用分批实验,通过对玉米秸秆降解过程中的pH、纤维素酶活性、微生物组成及秸秆降解率的检测,考察了复合菌系对玉米秸秆的降解特性.结果表明,在整个降解过程中,体系的pH处于6.5～7.5之间,基本保持稳定;Cb酶(β-葡萄糖苷酶)、Cx酶(内切β-1,4-葡聚糖酶)及C1酶(外切β-1,4-葡聚糖酶)随着秸秆的降解,依次进入高活性阶段,呈现出一定的协同性.真菌数量保持较高水平,细菌数量一直稳步上升,秸秆降解率在整个降解过程中也一直稳步上升.说明复合菌系具有一定的稳定性.

Properties of Composite Microbial System for Degrading Corn Stalk

By measuring pH,cellulase activity,microbial composition and the efficiency of corn-stalk degradation,the properties of a composite microbial system in decomposing corn stalk were investigated using batch experiments.The results indicated that the system pH remained stable at between 6.5 to 7.5 during the corn stalk degradation.Cb enzyme(β-glucosidase),Cx enzyme(endo-β-1,4-glucanase) and C1 enzyme(exo-β-1,4-glucanase) were,in turn,into highly active stage with the degradation of corn straw.There was a good synergic effect between them.The number of fungi maintained at a high level.The straw degradation efficiency had been a steady increase along with the bacteria amount increasing all the time in the whole process of corn straw degradation.The results showed that the straw-degradation inocula was stable.