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Spectroscopic Characteristics of Dissolved Organic Matter in Afforestation Forest Soil of Miyun District, Beijing.

Gao SJ, Zhao C, Shi ZH, Zhong J, Liu JG, Li JQ - J Anal Methods Chem (2016)

Bottom Line: The results suggested that the texture of soil sample was sandy.It can be included that afforestation can improve the soil quality to some extent, which can be partly reflected from the indexes like TOC, TN, TP, K(+), MBC, and DOC.And the characterization of DOM implied that UV humic-like substances were the major fluorophores components in the DOM of the soil samples, which consisted of aliphatic chains and aromatic components with carbonyl, carboxyl, and hydroxyl groups.

View Article: PubMed Central - PubMed

Affiliation: College of Forestry, Beijing Forestry University, Beijing 100083, China; Key Laboratory of Urban Stormwater System, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.

ABSTRACT
In this study, soil samples collected from different plain afforestation time (1 year, 4 years, 10 years, 15 years, and 20 years) in Miyun were characterized, including total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP), available K (K(+)), microbial biomass carbon (MBC), and dissolved organic carbon (DOC). The DOM in the soil samples with different afforestation time was further characterized via DOC, UV-Visible spectroscopy, excitation-emission matrix (EEM) fluorescence spectroscopy, and (1)H NMR spectroscopy. The results suggested that the texture of soil sample was sandy. The extracted DOM from soil consisted mainly of aliphatic chains and only a minor aromatic component. It can be included that afforestation can improve the soil quality to some extent, which can be partly reflected from the indexes like TOC, TN, TP, K(+), MBC, and DOC. And the characterization of DOM implied that UV humic-like substances were the major fluorophores components in the DOM of the soil samples, which consisted of aliphatic chains and aromatic components with carbonyl, carboxyl, and hydroxyl groups.

No MeSH data available.


Related in: MedlinePlus

1H NMR spectra of DOM in the extracted samples of the five sampling sites.
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fig4: 1H NMR spectra of DOM in the extracted samples of the five sampling sites.

Mentions: Proton NMR spectroscopy (1H NMR) was often utilized to characterize the composition of the DOM in soil samples, which can provide semiquantitative information on aromatic, aliphatic, and carboxylic groups [27, 44, 45]. Much different from UV-Visible spectroscopy and EEM, 1H NMR can give us the content and structural information via the corresponding integrated areas and the chemical shifts (δH) [18, 19]. As illustrated in Figure 4, the 1H NMR results of the five sites exhibit some distinct peaks overlaying bands, implying the existence of complicated mixtures in the DOM. Despite the large variety of overlapping resonances, each 1H NMR spectrum was analyzed based on the chemical shift assignments following the method described in the previously reported literatures for soil DOM [27]. The integrated regions in the 1H NMR spectra were listed as follows: δH = 0.5–2.9 ppm (aliphatic protons, H-C); δH = 3.0–4.2 ppm (carbohydrates, H-C-C=); and δH = 6.0–8.0 ppm (aromatic protons) [27]. The spectra of five sites were depicted in Figure 5. The 1H NMR results of the five sites exhibited similar patterns as to functional group composition, suggesting the presence of more aliphatic and carbohydrates structures and less quantity of aromatic organic matters (Table 6).


Spectroscopic Characteristics of Dissolved Organic Matter in Afforestation Forest Soil of Miyun District, Beijing.

Gao SJ, Zhao C, Shi ZH, Zhong J, Liu JG, Li JQ - J Anal Methods Chem (2016)

1H NMR spectra of DOM in the extracted samples of the five sampling sites.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4940562&req=5

fig4: 1H NMR spectra of DOM in the extracted samples of the five sampling sites.
Mentions: Proton NMR spectroscopy (1H NMR) was often utilized to characterize the composition of the DOM in soil samples, which can provide semiquantitative information on aromatic, aliphatic, and carboxylic groups [27, 44, 45]. Much different from UV-Visible spectroscopy and EEM, 1H NMR can give us the content and structural information via the corresponding integrated areas and the chemical shifts (δH) [18, 19]. As illustrated in Figure 4, the 1H NMR results of the five sites exhibit some distinct peaks overlaying bands, implying the existence of complicated mixtures in the DOM. Despite the large variety of overlapping resonances, each 1H NMR spectrum was analyzed based on the chemical shift assignments following the method described in the previously reported literatures for soil DOM [27]. The integrated regions in the 1H NMR spectra were listed as follows: δH = 0.5–2.9 ppm (aliphatic protons, H-C); δH = 3.0–4.2 ppm (carbohydrates, H-C-C=); and δH = 6.0–8.0 ppm (aromatic protons) [27]. The spectra of five sites were depicted in Figure 5. The 1H NMR results of the five sites exhibited similar patterns as to functional group composition, suggesting the presence of more aliphatic and carbohydrates structures and less quantity of aromatic organic matters (Table 6).

Bottom Line: The results suggested that the texture of soil sample was sandy.It can be included that afforestation can improve the soil quality to some extent, which can be partly reflected from the indexes like TOC, TN, TP, K(+), MBC, and DOC.And the characterization of DOM implied that UV humic-like substances were the major fluorophores components in the DOM of the soil samples, which consisted of aliphatic chains and aromatic components with carbonyl, carboxyl, and hydroxyl groups.

View Article: PubMed Central - PubMed

Affiliation: College of Forestry, Beijing Forestry University, Beijing 100083, China; Key Laboratory of Urban Stormwater System, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.

ABSTRACT
In this study, soil samples collected from different plain afforestation time (1 year, 4 years, 10 years, 15 years, and 20 years) in Miyun were characterized, including total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP), available K (K(+)), microbial biomass carbon (MBC), and dissolved organic carbon (DOC). The DOM in the soil samples with different afforestation time was further characterized via DOC, UV-Visible spectroscopy, excitation-emission matrix (EEM) fluorescence spectroscopy, and (1)H NMR spectroscopy. The results suggested that the texture of soil sample was sandy. The extracted DOM from soil consisted mainly of aliphatic chains and only a minor aromatic component. It can be included that afforestation can improve the soil quality to some extent, which can be partly reflected from the indexes like TOC, TN, TP, K(+), MBC, and DOC. And the characterization of DOM implied that UV humic-like substances were the major fluorophores components in the DOM of the soil samples, which consisted of aliphatic chains and aromatic components with carbonyl, carboxyl, and hydroxyl groups.

No MeSH data available.


Related in: MedlinePlus