A diffusive resistance porometer for field use. 1. Construction.

Published online
21 Dec 1971
Content type
Journal article
Journal title
Journal of Applied Ecology

Stiles, W.

Publication language


Details are given of the construction of a diffusion porometer for measuring stomatal resistances of leaf surfaces, based on principles described in F.C.A. 18: 2163. Water vapour from inside the leaf diffuses into an initially dry cup clipped on to it; after calibration, the surface resistance is estimated from the rate of increase of humidity in the cup. The humidity-sensing element is sulphonated polystyrene. [See also abs. 2202]-R.B.

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