title: Tracking fluorescent components of dissolved organic matter from soils in large-scale irrigated area.
abstract: Combination of fluorescence excitation-emission matrix spectroscopy with parallel factor analysis (PARAFAC) and principal component analysis (PCA) was engaged to track fluorescent components of dissolved organic matter (DOM) extracted from soils, to seek potential factors, and to reveal their correlations with physico-chemical properties of soils. Soil samples at different depths were collected in Hetao irrigated area of Inner Mongolia, China. Five fluorescent components (C1 to C5) were identified by PARAFAC modeling of DOM extracted from the soil samples. C1 was referred as fulvic-like fluorescent component, by which DOM was dominated in the whole soil samples. C2 was associated with salinity and agriculture, which was similar to marine humic-like fluorescent component. C3 was assigned as traditional humic-like fluorescent component. The three components were of the terrestrial origin. C4 was involved in tryptophan-like fluorescent component, which was autochthonous productions of biological degradation. C5 might be a polycyclic aromatic hydrocarbon contaminant, which could be relative to anthropogenic sources of pesticides. The C1, C2, and C3 were the potential factors of characterizing DOM fractions using PCA on fluorescent components and physico-chemical parameters. Moreover, DOM might restrained by exchangeable sodium percentage, and its formation and decomposition might be influenced by soil moisture.
authors.affiliation: School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, 450045, China.|State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing, 100012, China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Pan
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing, 100012, China. yhbybx@163.com.
authors.forename: Huibin
authors.initials: H
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing, 100012, China. songyh@craes.org.cn.
authors.forename: Yonghui
authors.initials: Y
authors.lastname: Song
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing, 100012, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing, 100012, China.
authors.forename: Ruixia
authors.initials: R
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China.
authors.forename: Erdeng
authors.initials: E
authors.lastname: Du
mesh_terms: D057914:Agricultural Irrigation; D001578:Benzopyrans / Q000032:analysis*; D005163:Factor Analysis, Statistical; D005456:Fluorescent Dyes / Q000032:analysis*; D006812:Humic Substances / Q000032:analysis*; D008962:Models, Theoretical; D025341:Principal Component Analysis; D054712:Salinity; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D012995:Solubility; D013050:Spectrometry, Fluorescence / Q000379:methods; D014872:Water Movements
chemical_list: D001578:Benzopyrans; D005456:Fluorescent Dyes; D006812:Humic Substances; D012987:Soil; D012989:Soil Pollutants; C005023:fulvic acid
keywords: Dissolved organic matter; Fluorescence spectroscopy; Parallel factor analysis; Principal component analysis; Soils