Seasonal variation in carbon dioxide exchange over a 200-year-old Chinese broad-leaved Korean pine mixed forest
Seasonal variation in carbon dioxide exchange over a 200-year-old Chinese broad-leaved Korean pine mixed forest
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DOI：
10.1016/j.agrformet.2006.02.004
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发表时间：
2006-04
影响因子：
6.2
通讯作者：
Jun-hui Zhang;Shijie Han;Guirui Yu
中科院分区：
文献类型：
--
作者：
Jun-hui Zhang;Shijie Han;Guirui Yu
在气候变化的背景下，对原始森林碳代谢的长期测量对于预测其行为和减少碳核算的不确定性至关重要。自2002年8月以来，应用涡度相关技术对中国科学院长白山森林生态系统开放研究站（128°28′E，42°24′N，吉林省）200年生阔叶红松混交林的碳交换进行了研究。利用2002年8月至2003年8月的开放路径涡动相关系统和CO2廓线测量系统资料，对生态系统CO2吸收和释放的相位和幅度以及汇/源状况进行了研究。由于存储和摩擦速度的修正被施加到涡流碳通量。分析了在普通WPL校正中被忽略的压力通量的行为，以在休眠期开发可接受的u* 范围。该生态系统是大气CO2的净汇，在研究期间吸收了−308± 116 gCm − 2。该森林的总碳收益和总碳损失估计值分别为-1432 ±216和-1124 ± 181 gCm-2。毛初级生产力（FGPP）和呼吸（RE）的季节变化趋势与植被吸收指数（VAI）和温度的变化密切相关。就生态系统碳平衡而言，夏季是最重要的季节。这一时期的净生态系统交换（FNEE）约为−298.0±65.2gCm−2。夏季90天对全年FGPP的贡献率为67.0%，对全年RE的贡献率为58.9%。本研究表明，原始森林可以成为大气CO2的强大净碳汇。涡度相关法估算年碳通量存在不确定性。需要对平流和压力通量进行更多的研究。
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°28′E and 42°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 CO2uptake and release and (2) sink/source status on the data obtained with open-path eddy-covariance system and CO2profile 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 CO2and sequestered −308±116gCm−2during the study period. The estimates of gross carbon gain and loss at this forest were −1432±216 and −1124±181gCm−2separately. The seasonal trend of gross primary productivity (FGPP) and respiration (RE) followed closely the change in vegetation absorption index (VAI) and temperature. The summer is the most significant season as far as ecosystem carbon balance is concerned. The net ecosystem exchange (FNEE) during this period was about −298.0±65.2gCm−2. The 90 days of summer contributed 67.0% of FGPP, 58.9% of REof 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.