Sources and fates of dissolved organic carbon in lakes as determined by whole-lake carbon isotope additions

被引:81
作者
Bade, Darren L.
Carpenter, Stephen R.
Cole, Jonathan J.
Pace, Michael L.
Kritzberg, Emma
Van de Bogert, Matthew C.
Cory, Rose M.
McKnight, Diane M.
机构
[1] Lund Univ, Dept Ecol Limnol, S-22362 Lund, Sweden
[2] Univ Colorado, Inst Arct & Alpine Res Civil & Environm Engn, Boulder, CO 80303 USA
[3] Univ Wisconsin, Ctr Limnol, Madison, WI 53706 USA
[4] Inst Ecosyst Studies, Millbrook, NY 12545 USA
基金
美国国家科学基金会;
关键词
allochthonous; autochthonous; carbon stable isotopes; dissolved organic carbon; INORGANIC CARBON; C-13; ADDITION; TERRESTRIAL SUPPORT; PRECAMBRIAN SHIELD; BACTERIAL-GROWTH; MATTER; PHYTOPLANKTON; METABOLISM; MARINE; FRESH;
D O I
10.1007/s10533-006-9013-y
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Four whole- lake inorganic C-13 addition experiments were conducted in lakes of differing trophic status. Inorganic C-13 addition enriched algal carbon in C-13 and changed the delta C-13- DOC by + 1.5 parts per thousand to + 9.5 parts per thousand, depending on the specific lake. This change in delta C-13- DOC represented a significant input of algal DOC that was not completely consumed by bacteria. We modeled the dynamics in delta C-13- DOC to estimate the fluxes of algal and terrestrial carbon to and from the DOC pool, and determine the composition of the standing stock. Two experiments in lightly stained, oligotrophic lakes indicated that algal production was the source of about 20% of the DOC pool. In the following year, the experiment was repeated in one of these lakes under conditions of nutrient enrichment, and in a third, more humic lake. Algal contributions to the DOC pool were 40% in the nutrient enriched lake and 5% in the more humic lake. Spectroscopic and elemental analyses corroborated the presence of increased algal DOC in the nutrient enriched lake. Natural abundance measurements of the delta C-13 of DOC in 32 lakes also revealed the dual contributions of both terrestrial and algal carbon to DOC. From these results, we suggest an approach for inferring the contribution of algal and terrestrial DOC using easily measurable parameters.
引用
收藏
页码:115 / 129
页数:15
相关论文
共 73 条
[21]   BACTERIAL PRODUCTION IN FRESH AND SALTWATER ECOSYSTEMS - A CROSS-SYSTEM OVERVIEW [J].
COLE, JJ ;
FINDLAY, S ;
PACE, ML .
MARINE ECOLOGY PROGRESS SERIES, 1988, 43 (1-2) :1-10
[22]   Persistence of net heterotrophy in lakes during nutrient addition and food web manipulations [J].
Cole, JJ ;
Pace, ML ;
Carpenter, SR ;
Kitchell, JF .
LIMNOLOGY AND OCEANOGRAPHY, 2000, 45 (08) :1718-1730
[23]   PATTERNS IN PLANKTONIC P-R RATIOS IN LAKES - INFLUENCE OF LAKE TROPHY AND DISSOLVED ORGANIC-CARBON [J].
DELGIORGIO, PA ;
PETERS, RH .
LIMNOLOGY AND OCEANOGRAPHY, 1994, 39 (04) :772-787
[24]   Dissolved organic and inorganic carbon mass balances in central Ontario lakes [J].
Dillon, PJ ;
Molot, LA .
BIOGEOCHEMISTRY, 1997, 36 (01) :29-42
[25]  
Efron B., 1994, INTRO BOOTSTRAP, DOI DOI 10.1007/978-1-4899-4541-9
[26]   13C/12C composition of marine dissolved organic carbon [J].
Fry, B ;
Hopkinson, CS ;
Nolin, A ;
Wainright, SC .
CHEMICAL GEOLOGY, 1998, 152 (1-2) :113-118
[27]   Long-term decomposition of DOC from experimental diatom blooms [J].
Fry, B ;
Hopkinson, CS ;
Nolin, A .
LIMNOLOGY AND OCEANOGRAPHY, 1996, 41 (06) :1344-1347
[28]  
Gergel SE, 1999, ECOL APPL, V9, P1377, DOI 10.1890/1051-0761(1999)009[1377:DOCAAI]2.0.CO
[29]  
2
[30]   THE CHEMICAL-COMPOSITION OF LAKES IN THE NORTH-CENTRAL UNITED-STATES [J].
GORHAM, E ;
DEAN, WE ;
SANGER, JE .
LIMNOLOGY AND OCEANOGRAPHY, 1983, 28 (02) :287-301