Woods F W, O'neal D
Science. 1965 Jan 8;147(3654):148-9. doi: 10.1126/science.147.3654.148.
Tritium was used to investigate the withdrawal by small trees of water from soil at three depths. Within 4 hours of placement at each depth, tritium was detected in the transpired water from nearby trees. On the 3rd day after application, 38 times more tritium (per unit volume) was present in transpired water drawn from soil at a depth of 0 to 30.5 centimeters than in water drawn from the 61- to 91.5-centimeter level.
用氚来研究小树从三个深度的土壤中吸收水分的情况。在每个深度放置氚后的4小时内，就在附近树木的蒸腾水中检测到了氚。施用后的第三天，从0至30.5厘米深度土壤中抽取的蒸腾水中的氚（每单位体积）比从61至91.5厘米深度抽取的水中多38倍。
