『Abstract
Dissolved organic matter(DOM) is believed to play an important
role in soil processes and in the N, S and P supplies to plants
in all types of soils, but most research has focused on forest
soils. This study aimed to assess the effect of soil factors and
soil parameters on DOC, DON and DOC/DON ratio of 190 arable soils
from Hungary. The soil samples are representative of the agricultural
soils of Hungary. To quantify the dynamics of DOC, DON and the
DOC/DON ratio, as affected by 14 soil parameters, multiple linear
regression was performed using (i) factor scores extracted by
principal component analysis and (ii) the soil parameters. The
results of PCR revealed that the soil factor N status had a major
influence on the DOC concentration in the soil and also on the
ratio to DOC to DON, but no relationship was found for DON. The
soil texture factor made a great contribution to both DOC and
DON, whilst the soil acidity factor had a positive effect on DOC
and a negative effect on DON. When regression was performed for
the soil parameters, soil organic matter and CEC were found to
make the greatest contribution to DOC and DON. Other variables,
such as the dissolved inorganic nitrogen, CaCO3
and EC of the soils, were also found to be decisive parameters.
Keywords: Dissolved organic matter; Dissolved organic carbon;
Dissolved organic nitrogen; Arable soils; Dataset; Principal component
analysis』
1. Introduction
2. Material and methods
2.1. Soil characteristics
2.2. Laboratory analysis
2.3. Data analysis
3. Results
3.1. Correlation between DOC, DON and DOC/DON ratio
3.2. PCA of soil properties
3.3. Factors controlling DOM: principal component regression
analysis (PCR)
3.4. Variables related to DOM: multivariate regression analysis
4. Discussion
4.1. Factors influencing the DOC and DON concentrations and
the DOC/DON ratio
4.1.1. Factor soil texture
4.1.2. Factor soil acidity
4.1.3. Factor soluble N status
4.2. Variables related to DOC and DON concentrations and the
DOC/DON ratio
4.2.1. SOM
4.2.2. DIN
4.2.3. CEC
4.2.4. EC
4.2.5. CaCO3
5. Conclusions
Acknowledgements
References