摘要
通过室内氧气培养试验,研究了玉米秸秆在分解期间(1～180d)'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(1～60d),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.
By means of an indoor oxygen incubating experiment, we determined the dynamic changes in the amounts of net organic carbon, humic acid（HA） and fulvic acid（FA）, and also estimated the effects of different oxygen concentrations on formation and transformation of humic substances. The results indicated that net amounts of “newly formed” organic carbon decreased gradually during corn stalk decomposition, however, the absolute and relative amounts of extractable humus （HE）, HA and FA increased at first, and then decreased.The proportion of HA in HE（PQ） exhibited the same trend as HA and FA at first, finally became equilibrium, indicating that FA took up formation faster than HA in the initial stage of incubation. With prolonged incubation, HA and FA transformed each other for a period of time （ 1 ～ 60day）, and then reached a homeostasis. High oxygen concentration advanced the activity of aerobiotic microorganism in soil, therefore, also advanced organic carbon decomposition. FA was much easier to translate into HA in high oxygen concentration.
出处
《吉林农业大学学报》
CAS
CSCD
北大核心
2005年第5期528-533,共6页
Journal of Jilin Agricultural University
基金
国家自然科学基金资助项目(40271069
40471076)
高校博士点基金资助项目(20040193002)
关键词
氧气浓度
玉米秸秆
有机碳
胡敏酸
富里酸
oxygen concentration
corn stalk
organic carbon
humic acid
fulvic acid
作者简介
通讯作者
