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为了降低玉米秸秆在贮存过程中微生物对其营养物质的消耗量及其木质纤维化程度,研究了玉米秸秆在冷藏及添加甲酸或乙二醇的贮存条件下,其p H值、可溶性糖(WSC)质量比、纤维素质量比、半纤维素质量比、木质素质量比的变化规律,分析不同处理方法的保质效果,并确定最佳保质贮存方法。结果表明,冷藏处理、添加甲酸或乙二醇均能在不同程度上降低玉米秸秆的营养物质消耗量,抑制其木质纤维化。乙二醇处理后的玉米秸秆,p H值迅速降低,其WSC质量比、半纤维素质量比、纤维素质量比和木质素质量比分别为9.56 g/100 g DM、14.12 g/100 g DM、34.60g/100 g DM和10.13 g/100 g DM,与不做任何物理或化学处理的保质方法(对照组)相比,WSC质量比、半纤维质量比分别提高了524.84%、35.77%,纤维素质量比、木质素质量比分别降低了9.03%、37.74%,保存了更多的营养物质,较大程度地降低了秸秆的木质纤维化程度,有利于后续水解处理和厌氧发酵。
In order to reduce the nutrient consumption of corn stalks and the degree of lignification, the p H value, soluble sugar (WSC), soluble sugar content ) Mass ratio, cellulose mass ratio, hemicellulose mass ratio, and lignin mass ratio, and analyzed the effect of different treatment methods on the quality control, and determined the best storage method. The results showed that cold storage treatment, addition of formic acid or ethylene glycol could reduce the nutrient consumption and inhibit the lignification of corn stalks to varying degrees. The p H value of corn stalk treated with ethylene glycol decreased rapidly, and the mass ratio of WSC, hemicellulose, cellulose and lignin were 9.56 g / 100 g DM, 14.12 g / 100 g DM , 34.60 g / 100 g DM and 10.13 g / 100 g DM respectively. The mass ratio of WSC to the mass fraction of hemicellulose increased by 524.84% and 35.77%, respectively, compared with those without any physical or chemical treatment (control group) The mass ratio of cellulose and lignin were reduced by 9.03% and 37.74%, respectively, which saved more nutrients and reduced the degree of lignification of straw to a great extent, which was benefit for subsequent hydrolysis and anaerobic fermentation.