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Effects of a controlled freeze-thaw event on dissolved and colloidal soil organic matter

Title
Effects of a controlled freeze-thaw event on dissolved and colloidal soil organic matter
Authors
Kim, Eun-AhLee, Ha KyungChoi, Jung Hyun
Ewha Authors
최정현
SCOPUS Author ID
최정현scopus
Issue Date
2017
Journal Title
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
ISSN
0944-1344JCR Link1614-7499JCR Link
Citation
vol. 24, no. 2, pp. 1338 - 1346
Keywords
Freeze-thawColloidDissolved organic matterFluorescence excitation-emission matrix (EEM)Fourier transformation infrared spectroscopy (FT-IR)Principal component analysis (PCA)
Publisher
SPRINGER HEIDELBERG
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
This study investigated the effects of the freezing and thawing that accompany the warming process on the composition of the soil organic matter in the dissolved and colloidal fractions. Temperate soil samples were incubated in a refrigerator at 2 A degrees C for 4 weeks and compared with those frozen at -20 A degrees C in the second week followed by thawing at 2 A degrees C to study a freeze-thaw effect with minimal effect from the thawing temperature. The freeze-thaw group was compared with those incubated at 25 A degrees C in the last week to investigate a warming effect after thawing. Thawing at 2 A degrees C after freezing at -20 A degrees C increased the dissolved organic carbon (DOC), but decreased colloidal Ca. The subsequent warming condition greatly increased both DOC and colloidal Ca. The colloidal organic carbon (COC) and dissolved Ca showed rather subtle changes in response to the freeze-thaw and warming treatments compared to the changes in DOC and colloidal Ca. The fluorescence excitation-emission matrix (EEM) and Fourier transformation-infrared spectrometry (FT-IR) results showed that the freeze-thaw and warming treatments gave the opposite effects on the compositions of dissolved humic-like substances, polysaccharides or silicates, and aliphatic alcohols. A principal component analysis (PCA) with the DOC, fluorescence EEM, and FT-IR spectra produced two principal components that successfully distinguished the effects of the freeze-thaw and warming treatments. Due to the contrasting effects of the freeze-thaw and warming treatments, the overall effects of freeze-thaw events in nature on the dissolved and colloidal soil organic matter could vary depending on the thawing temperature.
DOI
10.1007/s11356-016-7552-x
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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