Variability in exchange of CO2 across 12 northern peatland and tundra sites

被引:212
|
作者
Lund, Magnus [1 ]
Lafleur, Peter M. [2 ]
Roulet, Nigel T. [3 ]
Lindroth, Anders [1 ]
Christensen, Torben R. [1 ]
Aurela, Mika [4 ]
Chojnicki, Bogdan H. [5 ]
Flanagan, Lawrence B. [6 ]
Humphreys, Elyn R. [7 ]
Laurila, Tuomas [4 ]
Oechel, Walter C. [8 ]
Olejnik, Janusz [5 ]
Rinne, Janne [9 ]
Schubert, Per [1 ]
Nilsson, Mats B. [10 ]
机构
[1] Lund Univ, Dept Phys Geog & Ecosyst Anal, SE-22362 Lund, Sweden
[2] Trent Univ, Dept Geog, Peterborough, ON K9J 7B8, Canada
[3] McGill Univ, Dept Geog, Montreal, PQ H3A 2K6, Canada
[4] Finnish Meteorol Inst, FIN-00101 Helsinki, Finland
[5] Poznan Univ Life Sci, Dept Agrometeorol, PL-60649 Poznan, Poland
[6] Univ Lethbridge, Dept Biol Sci, Lethbridge, AB T1K 3M4, Canada
[7] Carleton Univ, Dept Geog & Environm Studies, Ottawa, ON K1S 5B6, Canada
[8] San Diego State Univ, Dept Biol, Global Change Res Grp, San Diego, CA 92182 USA
[9] Univ Helsinki, Dept Phys Sci, FIN-00014 Helsinki, Finland
[10] Swedish Univ Agr Sci, Dept Forest Ecol & Management, SE-90183 Umea, Sweden
基金
加拿大自然科学与工程研究理事会; 芬兰科学院;
关键词
carbon; carbon dioxide; eddy covariance; mire; net ecosystem exchange; peatland; photosynthesis; respiration; tundra; wetland; CARBON-DIOXIDE EXCHANGE; EDDY COVARIANCE TECHNIQUE; NET ECOSYSTEM EXCHANGE; ENVIRONMENTAL CONTROLS; ACCUMULATION RATES; METHANE EMISSIONS; SOIL RESPIRATION; PLANT BIOMASS; SCALE CARBON; WATER-VAPOR;
D O I
10.1111/j.1365-2486.2009.02104.x
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
Many wetland ecosystems such as peatlands and wet tundra hold large amounts of organic carbon (C) in their soils, and are thus important in the terrestrial C cycle. We have synthesized data on the carbon dioxide (CO2) exchange obtained from eddy covariance measurements from 12 wetland sites, covering 1-7 years at each site, across Europe and North America, ranging from ombrotrophic and minerotrophic peatlands to wet tundra ecosystems, spanning temperate to arctic climate zones. The average summertime net ecosystem exchange of CO2 (NEE) was highly variable between sites. However, all sites with complete annual datasets, seven in total, acted as annual net sinks for atmospheric CO2. To evaluate the influence of gross primary production (GPP) and ecosystem respiration (R-eco) on NEE, we first removed the artificial correlation emanating from the method of partitioning NEE into GPP and R-eco. After this correction neither R-eco (P = 0.162) nor GPP (P = 0.110) correlated significantly with NEE on an annual basis. Spatial variation in annual and summertime R-eco was associated with growing season period, air temperature, growing degree days, normalized difference vegetation index and vapour pressure deficit. GPP showed weaker correlations with environmental variables as compared with R-eco, the exception being leaf area index (LAI), which correlated with both GPP and NEE, but not with R-eco. Length of growing season period was found to be the most important variable describing the spatial variation in summertime GPP and R-eco; global warming will thus cause these components to increase. Annual GPP and NEE correlated significantly with LAI and pH, thus, in order to predict wetland C exchange, differences in ecosystem structure such as leaf area and biomass as well as nutritional status must be taken into account.
引用
收藏
页码:2436 / 2448
页数:13
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