Increases in fluxes of greenhouse gases and methyl mercury following flooding of an experimental reservoir

被引:255
作者
Kelly, CA
Rudd, JWM
Bodaly, RA
Roulet, NP
StLouis, VL
Heyes, A
Moore, TR
Schiff, S
Aravena, R
Scott, KJ
Dyck, B
Harris, R
Warner, B
Edwards, G
机构
[1] FISHERIES & OCEANS CANADA, INST FRESHWATER, WINNIPEG, MB R3T 2N6, CANADA
[2] MCGILL UNIV, DEPT GEOG, MONTREAL, PQ H3A 2K6, CANADA
[3] UNIV WATERLOO, INST GROUND WATER RES, WATERLOO, ON N2L 3G1, CANADA
[4] UNIV MANITOBA, DEPT BOT, WINNIPEG, MB R3T 2N2, CANADA
[5] TETRA TECH INC, OAKVILLE, ON L6J 4E6, CANADA
[6] UNIV WATERLOO, DEPT GEOG, WATERLOO, ON N2L 3G1, CANADA
[7] UNIV GUELPH, DEPT LAND RESOURCE SCI, GUELPH, ON N1G 2W1, CANADA
关键词
D O I
10.1021/es9604931
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Experimental flooding of a boreal forest wetland caused the wetland to change from being a small, natural carbon sink, with respect to the atmosphere, of -6.6 g of C m(-2) yr(-1) to a large source of +130 g of C m(-2) yr(-1). This change was caused by the death of the vegetation, which eliminated the photosynthetic CO2 sink and stimulated the microbial production of CO2 and CH4 from decomposition of plant tissues and peat. Another type of microbial activity that increased was the methylation of inorganic mercury to the much more toxic methyl mercury (MeHg) form. The wetland was a source of MeHg prior to flooding and became an even larger source (39 fold) after flooding. MeHg concentrations in the water sometimes exceeded 2 ng L-1, with the average being 0.9 ng L-1 in the first 2 years after flooding. MeHg also increased in the flooded vegetation and peat, in lower food chain organisms, and in fish. Two recommendations, which should minimize both greenhouse gas production and MeHg production in reservoirs, can be made: (1) minimize the total area of land flooded (i.e., avoid flooding areas of low relief) and (2) minimize the flooding of wetlands, which contain larger quantities of organic carbon than uplands and are sites of intense production of MeHg.
引用
收藏
页码:1334 / 1344
页数:11
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