为了筛选制备耐低温高效降解农业生物质废弃物的复合菌剂,在已获得的耐低温木质纤维素降解菌群A25-3 的基础上,采用混料设计(mixture design)对复合菌比例进行优化,通过测定菌群A25-3、酿酒酵母(Saccharomyces cerevisiae)和绿色木霉(Trichoderma viride)不同比例搭配对纤维素酶(CMCase、滤纸酶和外切葡聚糖酶)、蛋白酶和α-淀粉酶活性的影响,建立了各菌株(群)搭配比例与试验指标之间的回归方程。使用Design Expert 8.0 软件的优化功能对满足所有期望的响应值进行优化,得到复合菌的最优配比(质量分数)为绿色木霉37.24%,菌群A25-3 67.76%。对该最优比例进行验证试验,得到的结果与预测值基本一致。秸秆降解试验表明,固体复合菌剂可高效降解秸秆,有效提高堆肥体系的温度,在低温环境下的堆肥和秸秆腐熟具有很好的应用前景。
In this paper, an optimum mixture design is used for the preparation of cold-adapted multiple species inoculant. Based on the Design Expert software, a quadratic model is established as a function of the component fractions of species, such as the Saccharomyces cerevisiae, the Trichoderma viride and the flora A25-3, on the enzyme activity of the CMCase, the FPase, the cellobiohydrolase, the proteinase and the α-amylase. The response values satisfying all expectations are optimized,and the most excellent combinations of the Saccharomyces cerevisiae, the Trichoderma viride and the flora A25-3 are 0%, 37.24% and 67.76%, respectively. The result of the verification experiment on the formulation is consistent with the prediction. The straw degradation experiments show that the multiple species inoculant has a high level of degradation efficiency for the straw at a low temperature. It suggests that there is a great application prospect of the multiple species inoculant under cold conditions.
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