Dynamics of Newly Formed Humic Acid and Fulvic Acid in Aggregates after Addition of the 14C-Labelled Wheat Straw in a Typic Hapludoll of Northeast China
This research chose the Typic Hapludoll in the northeast of China and studied dynamics of newly formed humic acid (HA) and fulvic acid (FA) in aggregates after addition of the 14C-labelled wheat residues for 60,180,360 days incubation using the aggregates classification combined with chemistry grouping of humic substances.Based on 14C isotope tracer technology,the results showed that the sorting selection of >2,000 μm and 2,000-250 μm macroaggregates on newly formed 14C-HA and 14C-FA was higher than microaggregates.In the >2,000 μm and 2,000-250 μm macroaggregates,the 14C-HA/14C-FA ratio decreased with the increase of incubation time and the formation of 14C-FA was faster than 14C-HA,which humic substances formation supported lignin theory of Waksman.In the < 53 μm silt and clay components,14C-HA/14C-FA ratio increased with the increase of incubation days and the formation of 14C-HA was faster than 14C-FA,indicating that the formation of humic substances followed the polyphenol theory of Kononova.In conclusion,organic fertilization would facilitate the formation of macroaggregates and thereby result in an enhanced accumulation of humic substances in macroaggregates.Therefore,with more potential of carbon sequestration,the >2,000 μm and 2,000-250 μm macroaggregates may have important significance in the enhancement of soil carbon sequestration,fertility,and relief of elevated atmospheric CO2 concentration.
14C-labelled wheat straw Soil aggregates Humus formation Dynamics Humic acid (HA) Fulvic acid (FA) 14C-HA/14C-FA ratio
Sen Dou Song Guan Guang Chen Gang Wang
Department of Resource Science,College of Resource and Environmental Science,Jilin Agricultural Univ College of Life Science,Jilin Agricultural University,Changchun 130118,China
国际会议
the 16th Meeting of the International Humic Substances Society (第十六届国际腐殖物质学会大会(IHSS 16))
杭州
英文
18-21
2012-09-09（万方平台首次上网日期，不代表论文的发表时间）