Breakthrough of underground carbon cycle in the forest ecosystems using carbon stable isotope labeling technique

为了更好地了解森林生态系统的地下碳循环，2011年对一棵栎进行了7次13C标记。利用可调谐二极管激光吸收光谱法对树干、粗根和细根呼出的13CO2进行了跟踪，以确定碳转移的时间滞后和速度。季节相关性表现为夏季滞后时间短、流速大，秋季滞后时间长、流速小。

To better understanding of belowground carbon cycle in the forest ecosystems, 13C labeling method was applied to a Quercus serrata tree in the field 7 times in 2011. Respired 13CO2 from trunks, coarse and fine root was tracked using tunable diode laser absorption spectrometry to determine time lags and the velocity of carbon transfer. The seasonal dependencies were observed with shorter time-lags and higher velocity in the summer and longer time-lag and lower velocity in the autumn.