14C in speleothems

利用Th/U法测年所得的洞穴沉积物样品的绝对年龄，可以确定其~（14）C储层年龄。14 C库年龄主要由pCO 2在非饱和土壤区，根呼吸（与现代14 C水平）和土壤有机质的微生物分解（由于放射性衰变耗尽14 C）的比率控制。控制土壤条件的主要因素是土壤温度和降水。因此，14 C水库年龄的变化提供了这两个气候变量的变化信息。

Using the absolute age of speleothem samples from Th/U-dating, we can determine their 14C reservoir age. The 14C reservoir age is controlled mainly by pCO2 in the unsaturated soil zone, the ratio of root respiration (with modern 14C levels) and microbial decomposition of soil organic matter (depleted in 14C due to radioactive decay). The main factors governing soil conditions are soil temperature and precipitation. Hence, variations in the 14C reservoir age provide information on the variability of these two climate variables.