| Seasonal and annual variation of CO2 flux above a broadleaved Korean pine mixed forest | |
| Zhang J. H. ; Yu G. R. ; Han S. J. ; Guan D. X. ; Sun X. M. | |
| 2006 | |
| 关键词 | old-growth forest eddy-covariance carbon metabolism seasonal and annual dynamics water-vapor exchange carbon-dioxide exchange surface-air exchange tall vegetation micrometeorological observations ecosystem respiration soil respiration advection temperature grassland |
| 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 in the Changbai Mountains (128 degrees 28'E and 42 degrees 24'N, Jilin Province, P. R. China) since August 2002. On the data obtained with open-path eddy covariance system and CO2 profile measurement system from Jan. 2003 to Dec. 2004, this paper reports (i) annual and seasonal variation of F-NEE, F-GPP and R-E; (ii) regulation of environmental factors on phase and amplitude of ecosystem CO2 uptake and release Corrections due to storage and friction velocity were applied to the eddy carbon flux. L-AI and soil temperature determined the seasonal and annual dynamics of F-GPP and R-E separately. V-PD and air temperature regulated ecosystem photosynthesis at finer scales in growing seasons. Water condition at the root zone exerted a significant influence on ecosystem maintenance carbon metabolism of this forest in winter. The forest was a net sink of atmospheric CO2 and sequestered -449 g C(.)m 2 during the study period; -278 and -171 gC(.)m(2) for 2003 and 2004 respectively. F-GPP and F-RE over 2003 and 2004 were -1332, -1294 g C(.)m(-2) and 1054, 1124 g C(.)m(-2) respectively. This study shows that old-growth forest can be a strong net carbon sink of atmospheric CO2. There was significant seasonal and annual variation in carbon metabolism. In winter, there was weak photosynthesis while the ecosystem emitted CO2. Carbon exchanges were active in spring and fall but contributed little to carbon sequestration on an annual scale. The summer is the most significant season as far as ecosystem carbon balance is concerned. The 90 days of summer contributed 66.9, 68.9% of FG(PP), and 60.4, 62.1 % of R-E of the entire year. |
| 出处 | Science in China Series D-Earth Sciences |
| 卷 | 49 |
| 页 | 63-73 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1006-9313 |
| 内容类型 | SCI/SSCI论文 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22411]  |
| 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.,Yu G. R.,Han S. J.,et al. Seasonal and annual variation of CO2 flux above a broadleaved Korean pine mixed forest. 2006. |
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