Science. 1966 Feb 4;151(3710):574-6. doi: 10.1126/science.151.3710.574.
We describe a porometer that enables continuous monitoring of the stomatal diffusive resistance of leaves. The flux is measured of a gas-such as nitrous oxide-diffusing through a leaf that divides an enclosing chamber into two compartments. Nitrous oxide is added in known concentration to the airstream passing through the compartment on one side of the leaf and is recovered from the airstream passing through the opposite compartment. From measurements of the difference in concentration across the leaf and of the flux, the diffusive resistance of the leaf to N(2)O is calculated; this value, adjusted for resistance external to the leaf, gives a continuous record of internal diffusive resistance. This record can be made simultaneously with measurements of transpiration and photosynthesis.
我们描述了一种气体扩散阻力连续监测仪，可用于监测叶片的气孔扩散阻力。该仪器通过扩散穿过叶片的气体（如一氧化二氮）来测量流量，该叶片将封闭室分隔成两个隔室。将已知浓度的一氧化二氮添加到通过叶片一侧的空气流中，并从通过叶片另一侧的空气流中回收。根据叶片两侧浓度的差异和流量的测量值，计算出叶片对 N（2）O 的扩散阻力；对叶片外部阻力进行修正后，得到内部扩散阻力的连续记录。该记录可以与蒸腾和光合作用的测量同时进行。
