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于1984年生长季,利用氚水作为示踪剂对河北隆化碱房乡大水泉村西山28年生油松人工林树木蒸腾进行了测定。林木蒸腾速度变化明显,其最高值出现在7月份。整个生长季林木蒸腾速度平均值:1号标准地(2742株/公顷)为1.39毫米/天;4号标准地(1358株/公顷)为1.34毫米/天。林木蒸腾耗水总量约占同期降水量的60％,同土壤水量平衡提供的估计值相比较,氚水测量的结果是令人相当满意的。
In the growing season of 1984, tritiated water was used as tracer to measure the transpiration of 28-year-old Pinus tabulaeformis plantations in Xishan, Daishupquan village, Longfang, Longhua, Hebei Province. Forest transpiration rate changes significantly, the highest value appeared in July. The mean transpiration rates of forest trees throughout the growing season were 1.39 mm / day for standard 1 (2742 plants / hectare) and 1.34 mm / day for standard 4 (1358 plants / hectare). The total water consumption for forest transpiration is about 60% of the precipitation in the same period, and the result of tritiated water measurement is quite satisfactory compared with the estimate provided by soil water balance.