| Seasonal variation in carbon dioxide exchange over a 200-year-old Chinese broad-leaved Korean pine mixed forest | |
| Zhang J. H. ; Han S. J. ; Yu G. R. | |
| 2006 | |
| 关键词 | net ecosystem exchange gross primary production ecosystem respiration old-growth forest eddy-covariance friction velocity frequency-response corrections net primary production water-vapor exchange surface-air exchange eddy-covariance soil respiration flux corrections tall vegetation long-term micrometeorological observations |
| 英文摘要 | Long-term measurement of carbon metabolism of old-growth forests is critical to predict their behaviors and to reduce the uncertainties of carbon accounting under changing climate. Eddy-covariance technology was applied to investigate the long-term carbon exchange over a 200-year-old Chinese broad-leaved Korean pine mixed forest of Forest Ecosystem Open Research Station of Changbai Mountains (128 degrees 28'E and 42 degrees 24'N, Jilin Province, PR China), Chinese Academy of Sciences, since August 2002. This paper reports the result on (1) phase and amplitude of ecosystem CO2 uptake and release and (2) sink/source status on the data obtained with open-path eddy-covariance system and CO2 profile measurement system from August 2002 to August 2003. Corrections due to storage and friction velocity were applied to the eddy carbon flux. Behavior of pressure flux, neglected in common WPL correction, was analyzed to develop acceptable u(*) range in dormant periods. The ecosystem was a net sink of atmospheric CO2 and sequestered -308 +/- 116 g C m(-2) during the study period. The estimates of gross carbon gain and loss at this forest were -1432 +/- 216 and -1124 +/- 181 g C m(-2) separately. The seasonal trend of gross primary productivity (F-GPP) and respiration (RE) followed closely the change in vegetation absorption index (V-AI) and temperature. The summer is the most significant season as far as ecosystem carbon balance is concerned. The net ecosystem exchange (F-NEE) during this period was about -298.0 +/- 65.2 g C m(-2). The 90 days of summer contributed 67.0% of Fcpp, 58.9% of RE of whole year. This study shows that old-growth forest can be strong net carbon sink of atmospheric CO2. There are uncertainties in estimate of annual carbon fluxes with eddy-covariance method. More work on advection and pressure fluxes is warranted. (c) 2006 Elsevier B.V. All rights reserved. |
| 出处 | Agricultural and Forest Meteorology |
| 卷 | 137 |
| 期 | 3-4 |
| 页 | 150-165 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0168-1923 |
| 内容类型 | SCI/SSCI论文 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22413]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Zhang J. H.,Han S. J.,Yu G. R.. Seasonal variation in carbon dioxide exchange over a 200-year-old Chinese broad-leaved Korean pine mixed forest. 2006. |
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