title: The incidence and implications of clouds for cloud forest plant water relations.
abstract: Although clouds are the most recognisable and defining feature of tropical montane cloud forests, little research has focussed on how clouds affect plant functioning. We used satellite and ground-based observations to study cloud and leaf wetting patterns in contrasting tropical montane and pre-montane cloud forests. We then studied the consequences of leaf wetting for the direct uptake of water accumulated on leaf surfaces into the leaves themselves. During the dry season, the montane forest experienced higher precipitation, cloud cover and leaf wetting events of longer duration than the pre-montane forest. Leaf wetting events resulted in foliar water uptake in all species studied. The capacity for foliar water uptake differed significantly between the montane and pre-montane forest plant communities, as well as among species within a forest. Our results indicate that foliar water uptake is common in these forest plants and improves plant water status during the dry season.
authors.affiliation: Department of Integrative Biology, Valley Life Sciences Building, University of California, Berkeley, CA 94705, USA. grgoldsmith@berkeley.edu
authors.forename: Gregory R
authors.initials: GR
authors.lastname: Goldsmith
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Matzke
authors.forename: Todd E
authors.initials: TE
authors.lastname: Dawson
mesh_terms: D003364:Costa Rica; D017753:Ecosystem; D018515:Plant Leaves / Q000502:physiology*; D014329:Tropical Climate; D014867:Water / Q000502:physiology*; D014887:Weather
chemical_list: D014867:Water