论文部分内容阅读
通过室内氧气培养试验,研究了玉米秸秆在分解期间(1~180 d)“新形成”有机碳、胡敏酸(HA)、富里酸(FA)数量的动态变化规律及不同氧气浓度对其形成与转化的影响。结果表明:玉米秸秆分解期间,“新形成”净有机碳数量逐渐降低,而碱提取腐殖物质(HE)、HA和FA的绝对数量和相对数量都表现为先增加而后下降的趋势,HE中HA的比例即PQ先增加后下降,最终趋于平稳,说明最初FA的形成速度大于HA,随培养时间的推移,FA和HA经历了一段相互转化的过程(1~60 d),最终达到动态平衡。高氧气处理促进了好气性微生物的活性,有利于有机碳的分解,并且有利于FA向HA转化。
The dynamic changes of “new formation” of organic carbon, humic acid (HA) and fulvic acid (FA) in corn stalks during the decomposition (1 ~ 180 d) were studied through laboratory oxygen culture experiments. And the impact of conversion. The results showed that during the decomposition of corn stover, the amount of “freshly formed” net organic carbon decreased gradually, but the absolute amount and the relative amount of alkali extracted humic substances (HE), HA and FA all increased at first and then decreased. In HE The proportion of HA increased firstly and then decreased, finally stabilized. It indicated that the initial formation rate of FA was higher than that of HA. FA and HA underwent a process of conversion (1 ~ 60 d) balance. High oxygen treatment promotes the activity of aerobic microorganisms, facilitates the decomposition of organic carbon, and facilitates the conversion of FA to HA.