title: Organic matter source and degradation as revealed by molecular biomarkers in agricultural soils of Yuanyang terrace.
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.
authors.affiliation: Faculty of Environmental Science &Engineering, Kunming University of Science &Technology, Kunming, 650500, China.
authors.forename: Fangfang
authors.initials: F
authors.lastname: Li
authors.affiliation: Faculty of Environmental Science &Engineering, Kunming University of Science &Technology, Kunming, 650500, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Pan
authors.affiliation: Faculty of Environmental Science &Engineering, Kunming University of Science &Technology, Kunming, 650500, China.
authors.forename: Di
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Faculty of Environmental Science &Engineering, Kunming University of Science &Technology, Kunming, 650500, China.
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Yang
authors.affiliation: Faculty of Environmental Science &Engineering, Kunming University of Science &Technology, Kunming, 650500, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.affiliation: Faculty of Environmental Science &Engineering, Kunming University of Science &Technology, Kunming, 650500, China.
authors.forename: Shaohua
authors.initials: S
authors.lastname: Liao
authors.affiliation: Faculty of Environmental Science &Engineering, Kunming University of Science &Technology, Kunming, 650500, China.
authors.forename: Abdul
authors.initials: A
authors.lastname: Ghaffar
authors.affiliation: Faculty of Environmental Science &Engineering, Kunming University of Science &Technology, Kunming, 650500, China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Peng
authors.affiliation: Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003.
authors.forename: Baoshan
authors.initials: B
authors.lastname: Xing
mesh_terms: D000383:Agriculture; D002244:Carbon / Q000737:chemistry / Q000378:metabolism; D002681:China; D003300:Copper / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008031:Lignin / Q000737:chemistry / Q000378:metabolism; D008055:Lipids / Q000737:chemistry; D010084:Oxidation-Reduction; D010782:Photolysis / Q000528:radiation effects; D012987:Soil / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D008055:Lipids; D012987:Soil; D002244:Carbon; D003300:Copper; D008031:Lignin; C030973:cupric oxide