【摘要】 1987年生长季节,用氚水（³H₂O）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。更多还原

【Abstract】 Transpiration of a 33-yr-old Chinese pine (Pinus tabulae for mis Carr. ) plantation was studied by using tritiated water tracing method. The results showed that the transpiration rate of Chinese pine was linear proportional to its basal area at breast height. In whole growing period, the average transpiration rate was 2.7mm/day and the maximum value was 3.8mm/day which appeared at the beginning of August. Compared with the water balance method and Bowen ratio-energy balance method, the tritiated water method ran very well in field measurement of forest transpiration.更多还原