| Season-long measurement of carbon dioxide exchange in a boreal fen | |
| Andrew E. Suyker ; Shashi B. Verma ; Timothy J. Arkebauer | |
| 发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH
 |
| 1997 | |
| 卷号 | 102期号:D24页码:29,021 |
| 关键词 | Biosphere/atmosphere Interactions Turbulence |
| 产权排序 | Andrew E. Suyker, Department of Agricultural Meteorology and Center for Laser-Analytical Studies of Trace Gas Dynamics University of Nebraska, Lincoln; Shashi B. Verma, epartment of Agricultural Meteorology and Center for Laser-Analytical Studies of Trace Gas Dynamics University of Nebraska, Lincoln; Timothy J. Arkebauer, Department of Agronomy, University of Nebraska, Lincoln |
| 英文摘要 | Atmospheric CO2 exchange was measured in a boreal minerotrophic patterned fen in central Saskatchewan, Canada, using the eddy correlation technique. The study was conducted from mid-May to early October 1994, as part of the Boreal Ecosystem-Atmosphere Study (BOREAS). Herbaceous vegetation was dominated by buckbean (Menyanthes trifoliata) and various species of sedges (Carex and Eriphorum spp). Bog birch (Betula pumila) and willow species (Salve spp.) were dominant shrubs. Brown mosses were the predominant nonvascular vegetation. Canopy photosynthesis approached light saturation for PAR (photosynthetically active radiation) above 1000–1200 μmol m−2 s−1. High temperature (>20°C) and vapor pressure deficit (>1.5 kPa) decreased photosynthesis significantly. On cool days with low vapor pressure deficit, canopy photosynthesis tended to follow incident PAR. The diurnal pattern of canopy photosynthesis exhibited a midmorning maximum on days with high temperature and vapor pressure deficit. Canopy photosynthesis reached a peak of 0.59 mg CO2 m−2 s−1 (midday) in early July, corresponding to the period of maximum leaf area index. Another increase in photosynthesis occurred in late August as the canopy recovered from a brief rise in water table that inundated some of the leaf area. The daily net CO2 exchange showed significant day-to-day variability resulting from changes in environmental conditions. The integrated value of the net ecosystem-CO2 exchange during the measurement period (mid-May to early October) was about 88 g C m−2. Consistent with the high productivity and high water table, this fen exhibited magnitudes of CO2 exchange larger than other northern wetlands reported in the literature. |
| 语种 | 英语 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.yic.ac.cn/handle/133337/5688 |
| 专题 | 科研共享资源 |
| 推荐引用方式 GB/T 7714 | Andrew E. Suyker,Shashi B. Verma,Timothy J. Arkebauer. Season-long measurement of carbon dioxide exchange in a boreal fen[J]. JOURNAL OF GEOPHYSICAL RESEARCH,1997,102(D24):29,021. |
| APA | Andrew E. Suyker,Shashi B. Verma,&Timothy J. Arkebauer.(1997).Season-long measurement of carbon dioxide exchange in a boreal fen.JOURNAL OF GEOPHYSICAL RESEARCH,102(D24),29,021. |
| MLA | Andrew E. Suyker,et al."Season-long measurement of carbon dioxide exchange in a boreal fen".JOURNAL OF GEOPHYSICAL RESEARCH 102.D24(1997):29,021. |
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