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水稻或小麦秸秆表面均有蜡质层,它的存在是否影响微生物对秸秆的降解?试验选用几种不同有机溶剂,并以传统的酸碱预处理方法为对照,以溶解水稻秸秆表层的蜡质,然后接种微生物,探讨秸秆蜡质层对秸秆微生物降解速率的影响。结果表明,用乙醚、氯仿、正己烷等3种有机溶剂对秸秆进行预处理后,生物降解速率明显提高,正己烷处理效果最佳,秸秆失重率为29.4%,比未处理样(24.3%)提高了21.0%;有机溶剂正己烷预处理秸秆的半纤维素、纤维素和木质素的降解率分别为50.4%、28.1%、27.8%,比对照分别提高了22.2%、20.8%、28.0%,但低于传统的碱预处理。结果表明秸秆蜡质层影响秸秆生物降解,如果将秸秆蜡收集利用与秸秆生物降解预处理相结合,可探索出一条秸秆综合利用与生物降解新途径。
Rice or wheat straw surfaces are waxy, its presence affects the microbial degradation of straw? Test selected several different organic solvents, and the traditional acid-base pretreatment method as a control to dissolve the rice straw surface wax , And then inoculated with microorganisms to explore the impact of straw waxy layer on the degradation rate of straw microorganisms. The results showed that the biodegradation rate of straw was significantly increased after pretreatment with three kinds of organic solvents, such as ether, chloroform and n-hexane. The n-hexane treatment effect was the best. The weight loss rate of straw was 29.4%, which was 24.3% Increased by 21.0%. The degradation rates of hemicellulose, cellulose and lignin of straw pretreated with organic solvent were 50.4%, 28.1% and 27.8% respectively, which increased by 22.2%, 20.8% and 28.0% But lower than the traditional alkaline pretreatment. The results showed that the straw waxy layer affected the straw biodegradation. If the straw wax was collected and used in combination with straw biodegradation pretreatment, a new way of comprehensive utilization and biodegradation of straw could be explored.