Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 34487
Title Short communication: The effective thickness of water films on leaves.
Author(s) Hove, L.W.A. van; Adema, E.H.
Source Atmospheric Environment 30 (1996). - ISSN 1352-2310 - p. 2933 - 2936.
Department(s) Air Quality
Laboratory of Plant Physiology
Publication type Refereed Article in a scientific journal
Publication year 1996
Abstract There are indications that the adsorption of water-soluble gases like NH3 and SO2 on a leaf surface may be compared with the dry deposition on a freely accessible water layer. The aim of our study was to quantify the thickness of the apparent water layer on the leaf surface. The thickness was calculated from NH3 adsorption data on leaves. Also we performed weighing experiments with dried leaves of different plant species at relative air humidities of 20 and 95% (at 20oC), respectively. From the increase in weight the water film thickness was calculated. The thickness calculated from NH3 adsorption data strongly depends on air humidity and varied from 10 m at low relative humidities to 100 m at high relative humidities. However, the maximum water layer thicknesses obtained for the dried leaves were much lower (8.8-17.9 m). We postulate that the cuticular membrane may behave as a ''valve'' between the inner and outer region of the leaf and that its permeability is controlled by the relative humidity of the air. This view may be a fundamental contribution to the representation of the mechanism of the dry deposition of gaseous compounds to the vegetation.
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