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ORIGINAL RESEARCH
The Effect of Organic Compost Dosage on Changes
in Soil Dissolved Organic Matter Components
Analyzed with Three-dimensional Fluorescence
Spectroscopy and Ultraviolet Spectroscopy
1
College of Agriculture and Forestry Science, Hebei North University, Zhangjiakou 075000, China
2
Hebei Forestry and Grassland Bureau Scientific Research Institute, Shijiazhuang 050000, China
3
Agriculture and Rural Bureau of Chicheng County, Zhangjiakou City, Zhangjiakou 075500, China
Submission date: 2025-02-12
Final revision date: 2025-10-15
Acceptance date: 2025-11-15
Online publication date: 2026-04-10
Corresponding author
Haichao Zhao
College of Agriculture and Forestry Science, Hebei North University, Zhangjiakou 075000, China
College of Agriculture and Forestry Science, Hebei North University, Zhangjiakou 075000, China
Haixiang Zhao
Hebei North University, Hebei Key Laboratory of Quality & Safety Analysis-Testing for Agro-Products and Food, China
Hebei North University, Hebei Key Laboratory of Quality & Safety Analysis-Testing for Agro-Products and Food, China
KEYWORDS
TOPICS
ABSTRACT
The application of organic compost in farmland is a major agronomic measure to increase soil
organic matter content, enhance soil nutrients, and regulate soil microbial activity and other soil micro
components. The influence of organic compost dosage on soil DOM components was studied. In this study,
greenhouse pot experiments were conducted with 7 cattle manure organic compost dosage ratios of 0%,
5%, 10%, 20%, 40%, 60%, and 80%. Three-dimensional fluorescence spectroscopy with fluorescence
regional integrated volume integration (3DEEM-FRI) and ultraviolet spectroscopy (UV) were used to
analyze the effect of organic compost dosage on soil DOM components and structural characteristics.
The results indicated that with the increase in organic compost dosage, the soil TOM content
showed a linear increase, and the soil DOM content showed an exponential increase. The proportion
of humic acid-like components in soil DOM showed a linearly increasing trend, and the proportion
of tryptophan protein and fulvic acid components showed a linearly decreasing trend. The proportion
of tyrosine protein and microbial metabolites, as well as lignin and quinine in DOM components,
showed Exponential (Exp3P2) changes which first presented an increasing and then a decreasing
trend, and reached a turning point at 20 g∙kg⁻¹ of TOM. With the increase in the soil TOM content,
the substituents on the benzene ring of soil DOM transformed from non-polar functional groups,
such as fatty chains and esters, to polar functional groups such as hydroxyl, carboxyl, and carbonyl.
The molecular condensation degree, molecular weight, and humification degree of the soil DOM showed
a linearly increasing trend. The content of the hydrophobic organic component and the aromaticity
of the soil DOM showed a linearly decreasing trend, and the proportion of biogenic sources showed
an exponentially decreasing trend. The proportion of non-humified and humified substances in the soil DOM showed an initial increase and then a decreasing trend and reached the highest value at 35 g∙kg-1
of TOM. The organic compost dosage affected the proportion and molecular structure of the soil
DOM components by regulating the biological effects of microorganisms and enzyme activity, as well
as the conversion process from soil TOM to DOM.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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