Revealing the Inner Dynamics of Fulvic Acid from Different Compost-Amended Soils through Microbial and Chemical Analyses

Journal of Agricultural and Food Chemistry
Xu ZhangQiuling Dang

Abstract

The formation of fulvic acid (FA), an aromatic compound, is affected by the compost amendment. This study aimed to assess the extent of the humification of FA in soil amended with seven different composts. Results showed that composts improved the FA concentration in soil. Parallel factor (PARAFAC) analysis, combined with hetero-two-dimensional correlation spectroscopy (hetero-2DCOS), indicated that the inner changes in FA components determined the evolution of mineralization. The diversity in the composts used and the dominant microbes present might be responsible for the evolution of different mechanisms of FA transformation. Structural equation models (SEMs) demonstrated that the FA components were transformed directly by microbes, or indirectly via changes in the total organic carbon (TOC) and total nitrogen (TN) contents, C:N ratio, humic substance (HS) levels, and humic acid (HA): FA ratio, which regulate the microbial community structure. Our results will be useful for improving the bioavailability of compost products and realizing sustainable utilization of the soil.

References

Aug 22, 2017·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Yuqing WuYukihiro Ozaki
Jul 17, 2018·Journal of Agricultural and Food Chemistry·Fernando G FermosoGuillermo Rodríguez-Gutiérrez
Mar 2, 2019·Environmental Science & Technology·Xintong GaoZimin Wei
Mar 26, 2019·Journal of Agricultural and Food Chemistry·Xinyu XieJinxiang Cao
May 10, 2019·Journal of Agricultural and Food Chemistry·Xu ZhangJinxiang Cao

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