Spectroscopic properties and driving factors of dissolved organic matter in the Yellow River Delta

被引:1
作者
Cui, Yuan [1 ]
Luo, Fang-Li [1 ,2 ]
Zhang, Ming-Xiang [1 ,2 ]
Yu, Fei-Hai [1 ,3 ]
机构
[1] Beijing Forestry Univ, Sch Ecol & Nat Conservat, Beijing 100083, Peoples R China
[2] Grassland Adm, Key Lab Ecol Protect Yellow River Basin Natl Fores, Beijing 100083, Peoples R China
[3] Taizhou Univ, Inst Wetland Ecol & Clone Ecol, Zhejiang Prov Key Lab Plant Evolutionary Ecol & Co, Taizhou 318000, Peoples R China
基金
中国国家自然科学基金;
关键词
dissolved organic matter; estuary wetland; freshwater wetlands; spectroscopic property; tidal wetlands; SOIL CARBON; SPATIAL-DISTRIBUTION; MOLECULAR-WEIGHT; FRESH-WATER; FLUORESCENCE; SALINITY; NITROGEN; MARINE; OCEAN; ROOT;
D O I
10.1093/jpe/rtac037
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
River deltas are hot spots of biogeochemical cycling. Understanding sources and driving factors of dissolved organic matter (DOM) in river deltas is important for evaluating the role of river deltas in regulating global carbon flux. In this study, spectroscopic properties of soil DOM were analyzed in both freshwater and tidal areas of the Yellow River Delta. Five fluorescent components of soil DOM (two humic-like DOM, two protein-like DOM and one possible contaminant) were identified by parallel factor analysis and further confirmed by comparison with an online database. Concentration, spectroscopic properties and sources of soil DOM and its components differed between freshwater and tidal areas. DOM concentration was much higher in freshwater areas than in tidal areas. In freshwater areas, soil DOM was mainly derived from phytoplankton and microorganisms, while it was mainly derived from microorganisms and human activities in tidal areas. These differences in DOM between both areas were strongly driven by environmental factors, especially soil carbon (C), nitrogen (N) and its stoichiometric ratio C/N. These explained 80.7% and 69.6% of variations in DOM and chromophoric DOM (CDOM), respectively. In addition, phytoplankton also contributed to soil DOM, CDOM and fluorescent components C1-C4 as identified by significant positive correlations between them. These results imply that both the concentration and composition of soil DOM are strongly driven by soil properties and phytoplankton density in the Yellow River Delta.
引用
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页数:13
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