华北油松人工林蒸腾的研究

A STUDY ON TRANSPIRATION OF A CHINESE PINE (PINUS TABULAEFORMIS) PLANTATION, IN NORTH CHINA

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。

Tritiated water was used as tracer to measure tree transpiration in a 28-year old Chinese pine plantation of north China during the growing season of 1984. Transpiration rates of the pine tree varied obviously, the maximum value was found in July. Daily transpiration rated observed in the experimental period averaged 1.39mm/day in plot No.1 (stand density 2742 trees/ha) and 1.34mm/day in plot No.4 (stand density 1358 trees/ha). Quantity of water consummed by the plantation was about 60% of rainfall received during the experimental period.The results obtained from tritiated water were satisfactory as compared with estimates by method of water balance in soil