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利用氚水(HTO)测量树木的蒸腾量和生物量是最近十几年核技术在林业方面应用的成果之一。长期以来,由于树木高大,测量树木蒸腾量和生物量存在着一定的困难。目前,多数的方法是通过对土壤和气象的观测来估算蒸腾量,通过伐倒标准术称重来计算生物量。但这些方法不仅手续复杂,而且破坏性大。而氚化水方法则是非破坏性的直接测量树木蒸腾量和生物量简单、有效的方法。其理论基础是稳流系统中的示踪动力学。Borgner(1961,1965,1966),Ljunggren(1967),orr and Gillespie(1968)等人的工作为这个理论
Measurement of tree transpiration and biomass using tritiated water (HTO) has been one of the achievements of nuclear technology in forestry in recent ten years. For a long time, due to tall trees, there are some difficulties in measuring tree transpiration and biomass. At present, the most common method is to estimate the amount of transpiration by observing soil and meteorology and to calculate the amount of biomass by means of calking. However, these methods are not only complicated and destructive. The tritiated water method is a nondestructive, simple and effective method for directly measuring tree transpiration and biomass. Its theoretical basis is the tracer kinetics in a steady flow system. The work of Borgner (1961, 1965, 1966), Ljunggren (1967), orr and Gillespie (1968) and others