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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

EEM fluorescence contour profiles of the five sites' DOM.
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Related In: Results  -  Collection


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fig3: EEM fluorescence contour profiles of the five sites' DOM.

Mentions: The excitation-emission matrix (EEM) fluorescence technique is powerful to provide sufficient information on DOM's molecular size, chemical composition, and aromaticity or aliphatic properties [5, 27]. EEM can identify humic-like (designated as A, C, and M) and protein-like fluorescence peaks (B and T), as listed in Table 4. EEM fluorescence spectra of the study areas samples were depicted in Figures 3(a)–3(e), suggesting that the UV humic-like substances were the primary fluorophores components in the DOM extracted from afforestation land samples [38]. The first identified peak (peak A) was located at Ex/Em of 257 nm/448 nm, 256 nm/440 nm, 262 nm/443 nm, 260 nm/425 nm, and 260 nm/435 nm for the Y-1, Y-4, Y-10, Y-15, and Y-20 samples, respectively, suggesting the existence of UV humic-like substances. The second typical peak (peak T) was observed at Ex/Em of 271 nm/347 nm, 280 nm/325 nm, 275 nm/338 nm, 279 nm/333 nm, and 271 nm/339 nm for the five samples stated above, respectively, implying the presence of tryptophan protein-like components [38]. Generally, DOM in soil is affected by some factors like local geology, land use, and microbial and human activities [38]. And it can be believed that the presence of tryptophan protein-like substances could further confirm the larger molecular weight DOM presented in the soil [39, 40].


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)

EEM fluorescence contour profiles of the five sites' DOM.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig3: EEM fluorescence contour profiles of the five sites' DOM.
Mentions: The excitation-emission matrix (EEM) fluorescence technique is powerful to provide sufficient information on DOM's molecular size, chemical composition, and aromaticity or aliphatic properties [5, 27]. EEM can identify humic-like (designated as A, C, and M) and protein-like fluorescence peaks (B and T), as listed in Table 4. EEM fluorescence spectra of the study areas samples were depicted in Figures 3(a)–3(e), suggesting that the UV humic-like substances were the primary fluorophores components in the DOM extracted from afforestation land samples [38]. The first identified peak (peak A) was located at Ex/Em of 257 nm/448 nm, 256 nm/440 nm, 262 nm/443 nm, 260 nm/425 nm, and 260 nm/435 nm for the Y-1, Y-4, Y-10, Y-15, and Y-20 samples, respectively, suggesting the existence of UV humic-like substances. The second typical peak (peak T) was observed at Ex/Em of 271 nm/347 nm, 280 nm/325 nm, 275 nm/338 nm, 279 nm/333 nm, and 271 nm/339 nm for the five samples stated above, respectively, implying the presence of tryptophan protein-like components [38]. Generally, DOM in soil is affected by some factors like local geology, land use, and microbial and human activities [38]. And it can be believed that the presence of tryptophan protein-like substances could further confirm the larger molecular weight DOM presented in the soil [39, 40].

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