1987年生长季节,用氚水(~3H_2O)为示踪剂测定了33年生油松人工纯林的蒸腾。结果表明:在整个生长季节中,林分的平均日蒸腾速率为2.7mm/day,最大值出现在8月初,为3.8mm/day。同时发现,林木的蒸腾速率与其生长势成正相关.此外,对氚水示踪法、水分平衡法、能量平衡法等三种方法进行了比较,结果表明,氚水法是野外测定森林蒸腾的一种有效方法。 In 1987 growing season, tritiated water (~ 3H_2O) was used as tracer to measure the transpiration of Pinus tabulaeformis plantation. The results showed that the average daily transpiration rate was 2.7 mm / day and the maximum appeared at the beginning of August in the entire growing season, which was 3.8 mm / day. At the same time, it was found that the transpiration rate of forest was positively correlated with its growth potential.In addition, three methods of tritiated water tracing method, water balance method and energy balance method were compared. The results showed that tritiated water method was one Effective method.