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Organic matter source and degradation as revealed by molecular biomarkers in agricultural soils of Yuanyang terrace.

Li F, Pan B, Zhang D, Yang X, Li H, Liao S, Ghaffar A, Peng H, Xing B - Sci Rep (2015)

Bottom Line: Three soils with different tillage activities were collected and compared for their organic matter sources and degradation.BC was involved in mineral interactions for TD and TP.The dynamics of organic matter needs to be extensively examined for their nonideal interactions with contaminants.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Environmental Science &Engineering, Kunming University of Science &Technology, Kunming, 650500, China.

ABSTRACT
Three soils with different tillage activities were collected and compared for their organic matter sources and degradation. Two soils (TD and TP) with human activities showed more diverse of chemicals in both free lipids and CuO oxidation products than the one (NS) without human activities. Branched alkanoic acids only accounted for less than 5% of lipids, indicating limited microbial inputs in all three investigated soils. The degradation of lignin in NS and TD was relatively higher than TP, probably because of the chemical degradation, most likely UV light-involved photodegradation. Lignin parameters obtained from CuO oxidation products confirmed that woody gymnosperm tissue (such as pine trees) may be the main source for NS, while angiosperm tissues from vascular plant may be the predominant source for the lignins in TD and TP. Analysis of BPCAs illustrated that BC in NS may be mainly originated from soot or other fossil carbon sources, whereas BC in TD and TP may be produced during corn stalk and straw burning. BC was involved in mineral interactions for TD and TP. The dynamics of organic matter needs to be extensively examined for their nonideal interactions with contaminants.

No MeSH data available.


Related in: MedlinePlus

Lignin source parameters of the three investigated soils.C/V is calculated as the ratio of cinnamyl/vanillyl phenols. S/V is syringyl/vanillyl phenols. The plot of S/V vs. C/V is modified from reference26.
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f4: Lignin source parameters of the three investigated soils.C/V is calculated as the ratio of cinnamyl/vanillyl phenols. S/V is syringyl/vanillyl phenols. The plot of S/V vs. C/V is modified from reference26.

Mentions: According to the plot of S/V vs. C/V (Fig. 4), lignin-derived SOM of these soils showed mixtures of different sources, including at least two different types of plant tissues (nonwoody angiosperm and woody gymnosperm). Lignin phenol vegetation index (LPVI) is another useful parameter to identify lignin sources24, and is calculated as s*(s + 1)/(v + 1) + 1)*((c + 1)/(v + 1) + 1) (in which s = 100*S/(S + V + C), c = 100*C/(S + V + C), and v = 100*V/(S + V + C)). The resulted LPVI values were 67.7 ± 12.0 for TD, and 96.8 ± 10.4 for TP. This result again suggested that woody angiosperm tissues (LPVI in the range of 67-415) are a significant contribution to the lignin-derived SOM in TD and TP. According to the field investigation, the local farmers either burnt the biomass in the farm land, or use the straws as forage of livestock. Thus, nonwoody-materials seldom accumulated in TD and TP. In addition, woody angiosperm-derived SOM in the original soil before cultivation may be protected in the soil particles. Some fresh organic matter carried in the irrigation water may also contribute to the woody angiosperm-derived SOM in TD and TP. The LPVI value of NS was 5.7 ± 0.4, which is consistent with the C/V value, suggesting the important input of woody gymnosperm (such as pine trees).


Organic matter source and degradation as revealed by molecular biomarkers in agricultural soils of Yuanyang terrace.

Li F, Pan B, Zhang D, Yang X, Li H, Liao S, Ghaffar A, Peng H, Xing B - Sci Rep (2015)

Lignin source parameters of the three investigated soils.C/V is calculated as the ratio of cinnamyl/vanillyl phenols. S/V is syringyl/vanillyl phenols. The plot of S/V vs. C/V is modified from reference26.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4457134&req=5

f4: Lignin source parameters of the three investigated soils.C/V is calculated as the ratio of cinnamyl/vanillyl phenols. S/V is syringyl/vanillyl phenols. The plot of S/V vs. C/V is modified from reference26.
Mentions: According to the plot of S/V vs. C/V (Fig. 4), lignin-derived SOM of these soils showed mixtures of different sources, including at least two different types of plant tissues (nonwoody angiosperm and woody gymnosperm). Lignin phenol vegetation index (LPVI) is another useful parameter to identify lignin sources24, and is calculated as s*(s + 1)/(v + 1) + 1)*((c + 1)/(v + 1) + 1) (in which s = 100*S/(S + V + C), c = 100*C/(S + V + C), and v = 100*V/(S + V + C)). The resulted LPVI values were 67.7 ± 12.0 for TD, and 96.8 ± 10.4 for TP. This result again suggested that woody angiosperm tissues (LPVI in the range of 67-415) are a significant contribution to the lignin-derived SOM in TD and TP. According to the field investigation, the local farmers either burnt the biomass in the farm land, or use the straws as forage of livestock. Thus, nonwoody-materials seldom accumulated in TD and TP. In addition, woody angiosperm-derived SOM in the original soil before cultivation may be protected in the soil particles. Some fresh organic matter carried in the irrigation water may also contribute to the woody angiosperm-derived SOM in TD and TP. The LPVI value of NS was 5.7 ± 0.4, which is consistent with the C/V value, suggesting the important input of woody gymnosperm (such as pine trees).

Bottom Line: Three soils with different tillage activities were collected and compared for their organic matter sources and degradation.BC was involved in mineral interactions for TD and TP.The dynamics of organic matter needs to be extensively examined for their nonideal interactions with contaminants.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Environmental Science &Engineering, Kunming University of Science &Technology, Kunming, 650500, China.

ABSTRACT
Three soils with different tillage activities were collected and compared for their organic matter sources and degradation. Two soils (TD and TP) with human activities showed more diverse of chemicals in both free lipids and CuO oxidation products than the one (NS) without human activities. Branched alkanoic acids only accounted for less than 5% of lipids, indicating limited microbial inputs in all three investigated soils. The degradation of lignin in NS and TD was relatively higher than TP, probably because of the chemical degradation, most likely UV light-involved photodegradation. Lignin parameters obtained from CuO oxidation products confirmed that woody gymnosperm tissue (such as pine trees) may be the main source for NS, while angiosperm tissues from vascular plant may be the predominant source for the lignins in TD and TP. Analysis of BPCAs illustrated that BC in NS may be mainly originated from soot or other fossil carbon sources, whereas BC in TD and TP may be produced during corn stalk and straw burning. BC was involved in mineral interactions for TD and TP. The dynamics of organic matter needs to be extensively examined for their nonideal interactions with contaminants.

No MeSH data available.


Related in: MedlinePlus