Fluorescence index as an indicator of dissolved organic carbon quality in hydrologic flowpaths of forested tropical watersheds

被引：55
|
作者：
Johnson, Mark S. [1 ,2 ]
Couto, Eduardo G. [3 ,4 ]
Abdo, Mara [5 ]
Lehmann, Johannes [6 ]
机构：
[1] Univ British Columbia, Inst Resources Environm & Sustainabil, Vancouver, BC V6T 1Z4, Canada
[2] Univ British Columbia, Dept Earth & Ocean Sci, Vancouver, BC V6T 1Z4, Canada
[3] Univ Fed Mato Grosso, Dept Soil Sci, Cuiaba, Brazil
[4] Univ Fed Mato Grosso, Program Ecol & Biodivers, Cuiaba, Brazil
[5] Univ Estado Mato Grosso, Dept Ciencias Biol, Tangara Da Serra, MT, Brazil
[6] Cornell Univ, Dept Crop & Soil Sci, Ithaca, NY USA
来源：
BIOGEOCHEMISTRY | 2011年 / 105卷 / 1-3期
关键词：
Baseflow; Fluorescence index; Emergent groundwater; Overland flow; Stormflow; Throughfall; HEADWATER CATCHMENTS; FULVIC-ACID; MATTER; STREAM;
D O I：
10.1007/s10533-011-9595-x
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Over two hundred samples were collected in tropical headwater forested catchments in the lowland Amazon basin near Juruena, Mato Grosso Brazil. These were analyzed for fluorescence characteristics and DOC concentrations, and represented a range of terrestrial hydrologic flowpaths and first-order streams during baseflow and stormflow conditions. The fluorescence index (FI) of McKnight et al. (2001) was found to have a significant relationship with DOC concentrations for stream water at baseflow conditions, but FI values within individual terrestrial flowpaths and stormflow varied little for the range of DOC concentrations observed. FI values were seen to increase for increasing residence time of water within the terrestrial ecosystem, while DOC concentration decreased for increasing hydrologic residence time. The FI of terrestrial flow paths indicated that DOC became increasingly characterized by microbially derived carbon for flow paths with longer residence times, on the order through fall and overland flow < percolating soil water < groundwater. Base flow samples of stream water had a mean FI value of 1.78, compared with 1.51 and 1.44 for through fall and overland flow, respectively, and 1.65 for percolating soil water. The FI values for stream water at base flow were also seen to vary seasonally, and were inversely proportional to DOC concentrations over time.
引用
收藏
页码：149 / 157
页数：9
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