Molecular Characteristics of Soil Dissolved Organic Matter in Response to Decomposition of Organic Fertilizers from Different Sources

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Supported by the Natural Science Foundation for High-level Talents from Basic and Applied Basic Research Programs of Hainan Province, China (No. 2019RC022) and the Natural Science Foundation of Hainan Province, China (No. 322MS017)

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    【Objective】 Dissolved organic matter(DOM)derived from organic fertilizers may provide new insights into the potential applications of different commercial organic fertilizers.【Method】 Herein, four different sources of organic fertilizers (biochar, WSB; sheep manure, SM; seaweed, SW; shrimp peptide, SP) with soils around the Changhua mine site were used to carry out a three-month incubation experiment. The subsequent effect of organic fertilizer amendment on molecular characteristics of soil DOM was investigated using multivariate spectral analysis. 【Result】 Compared to the control, soil DOM concentrations significantly increased in response to organic fertilizers amendment during the whole incubation period, exhibiting the lowest increment in WSB treatment and the highest increment in SW treatment, respectively. The excitation-emission matrix with parallel factor (EEM-PARAFAC) showed that WSB increased the proportion of humic-like fluorophore of soil DOM while fulvic acid-like fluorophore decreased during the whole incubation period. Also, SM, SW and SP amendments lowered the proportion of microbially-transformed humic-like fluorophore and increased the proportion of fulvic-acid like fluorophore during 0-45 days, but increased the proportion of refractory humic-like fluorophore during 45-90 days. Two-dimensional correlation spectroscopy analysis on Fourier-transform infrared (2D-FTIR-COS) spectroscopy revealed that aromatic/carboxylic acid groups of soil DOM in the control and SP treatments and alkene/polysaccharide groups in the added WSB, SW and SM treatments had the fastest responses over time, respectively. In addition, Si-O-Al signals from soil nano-minerals functional groups exhibited a distinct response over time in the added WSB and SP treatments. The carbon near-edge X-ray absorption fine structure (C 1s NEXAFS) analysis showed that compared to control, the added WSB increased the proportion of oxygenated aliphatic fractions but reduced aromatic/phenolic fractions of soil DOM after incubation. Also, SW increased the proportion of aromatic and carbonyl fractions but reduced aliphatic and oxyalkyl fractions while SM and SP increased the proportion of phenolic, aromatic and aliphatic fractions but reduced the proportion of carboxyl, oxyalkyl and carbonyl fractions. 【Conclusion】 The results of this study can enhance our understanding of how the decomposition of different sources of organic fertilisers affects the molecular characteristics of soil DOM. This is essential for assessing the ecological effects of the application of commercial organic fertilisers in soils.

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CHEN Liming, WU Yueying, LI Caisheng, WU Zhipeng, HUANG Cheng, JI Hengkuan, HOU Zhengwei, FU Chuanliang, ZHAO Yidong, WU Weidong. Molecular Characteristics of Soil Dissolved Organic Matter in Response to Decomposition of Organic Fertilizers from Different Sources[J]. Acta Pedologica Sinica,2023,60(4):1101-1112.

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  • Received:November 29,2021
  • Revised:April 28,2022
  • Adopted:July 07,2022
  • Online: July 08,2022
  • Published: July 28,2023